Talk:Bell P-39 Airacobra/Archive 1

Archive 1

Archive 2

P-39 performance

Answering to the 2 previous guys - indeed Spitfire could exceed 450mph, however its wing structure was not able to substain more speed than that with safety.This meant that some high-g would break the wing apast.Instead the P-39 could dive that fast with safety. In recent years what changed people's perconception's about P-39 is the Ubisoft flight simulator IL-2 FB, which as people who flew the P-39 (and several other warbirds) claim that is very close to the real thing as a flight sim can go. I would describe my impressions from the sim, and indeed war vets confirm these impressions.(by the way, I have a pilot lisence, even I have logged hours only in Cessnas 152/182, if that matters). You had to be very able with this plane.For example,with the Spitfire there was not much you could do:Just press 110% power, and try to go to the enemy.Spitfire didn't have even combat flaps.If you were going to make a stupidity, Spit would stall and then just give it a bit of opposite rudder and it would gain some speed and come back to your control. With P-39 you had to play with the throttle, combat flaps to try to get the best of it.P-39 was like a mid-engined car in some ways.It was oversensitive in pitch and this could make difficult for a novice pilot to aim and shoot a target.At least in the flight sim, it felt almost like sliding in the air like a car that slides in its four tires! Roll was fast, even not as fast as P-40 or Fw-190. A P-39 pilot had to be very careful with the rudder too.This was something that was greatly improved in P-63.P-39 didn't like sudden turns of the stick in various directions, something that a novice pilot would often do in his panic to avoid an enemy in its 6 o' clock.This was a certain way to stall.P-39 had a very unusual 30km/h flat spin which was impossible to escape!This was the worst characteristic in this plane. In various maneuvres it was necessary to obtain a certain speed.On the other hand, it could fly in the vertical until almost 30km/h, however this was extremely dangerous for a un-experienced pilot.Only the fantastic Bf-109 was better in this. A Spitfire would just point its nose down, as Yaks would do and other well-mannered planes, however in much higher speed... The P-39 was extremely aerodynamic, actually possibly even better than the P-51 and P-38, two planes that were excellent in this area.Pushing the throttle down, it wouldn't mean an instantaneous fall in speed as it would mean for various aircooled figthers...This would make more difficult to calculate its speed and then been in danger to fly ahead a target. For these reasons the P-39 was from fast to very fast in low altitudes and NOT as bad in medium altitudes, depending on the version and the year-period we are talking about.Don't think that a Spit LF IX was faster in low altitudes...just a bit better in climb speed, due to its more powerful engine. In dive was very fast (again only Bf-109 and the P-38/P-51 were as good). It was, probably to its engine arrangement, more difficult to shoot down than every-other liquid-engined fighter.Its 37mm cannon was really devastating ( I cut in 2 pieces a Ju-88 with just one shell in a mission...), however you needed to approach very close, due to its low muzzle velocity.This again needed an experienced pilot.Instead a novice P-47 pilot could almost spray the sky with bullets of high-velocity muzzles and have a chance to shoot down an enemy plane when the P-39's 2 0.50's were inadequate. Ah, and the car-like canopy was horrible, restricting vision. Conclusion: The P-39 was unpopular because it need an experienced pilot to get the best out of it (something not good at all when thousends of young americans were thrown in battle with absolutely no combat experience).Its canopy would make escape difficult and it didn't fit well to the specific operational needs of the USAAF. In a few words...what a plane! (the flight sim has the versions P-400, P-39D-1, P-39D-2, P-39N, P-39Q-1, P-39Q-10)

Funny. Just watched a doc. on the P-39. Said the visibility from this canopy was excellent and was the inspiration for future "bubble type" canopies. I believe the documentary. It also stated the carlike doors could make escape difficult. —Preceding unsigned comment added by 74.46.23.27 (talk) 18:57, 20 April 2010 (UTC)

One paragraph states P-39 was too heavy compared to its contemporaries which made it inferior to other fighters, then the following parapgraph states it was an air superiority fighter in the hands of VVS. The truth is that while P-39 was somewhat heavier than some of its contemporaries, it was held by many to be one of the best low-altitude fighters of the war in terms of both speed and agility. Soviets liked it so much they worked with Bell on P-63 (least favorite lend-lease aircraft? Hurricane hands down). A remarkable feature of the P-39 was its very clean aerodynamics - I've read pilot accounts of difficulty bleeding off speed. The P-39Q-1 pilot's manual authorizes dives to 523 mph (825 km/h)! Spitfire IX manual says 450 mph (725 km/h) is the limit. - Emt147 ^Burninate! 17:23, 4 December 2005 (UTC)

I suspect the 450 mph figure for the Spitifre IX is given for a height an Airacobra coudn't even reach. The 450 mph figure you've quoted itself seems strange, as it's not that much faster than a Spitifre IX's top speed in level flight, and the Spitfire had one of the highest Critical Mach numbers ever measured. There should be higher IAS figures given for lower heights, the indicated speed increasing as the air becomes thicker at the lower altitudes. I suspect the highest figure should be around 550 mph for a Sptifire IX, but I don't have the Pilot's Notes myself.

According to Jeffrey Quill's Spitfire - A Test Pilot's Story, the Mark IX's Pilot's Notes gives a table of Vne figures at various heights, one of which works out at M 0.85. Quill's department themselves were diving Spitfire IXs to speeds slightly in excess of Mach 0.86

As mentioned in the article, the Airacobra/P-39s measured performance was considerably down on the figures given to the British Purchasing Commission and on which the 1940 British order was based. The results of an enquiry into this led to the setting up of an evaluation centre, similar to the A&AEE at Martlesham Heath (later Boscombe Down), at Muroc Field in the US. Ian Dunster 12:17, 26 July 2006 (UTC)

Spitfire were FAST also in dives. One of Spit Mk IX reached 960 kmh and more, perhaps over 1100, in a dive. When spit had airframe of the advanced models the structure was reinforced and so, it can reach a real hig mach number. P-39 was strong, no doubt, but its performance at altitude was hampered by rejecting the turbocharger, that was fitted on the same Allison engine in P-38s. This because the 'drag' of the stuff. But this eliminated the possibility to reach high performance with Allison, and none P-39 was fitted with Merlin.--Stefanomencarelli 08:56, 26 July 2007 (UTC)

---

Seen how P-39s in Italy was badly cutted, i report the whole history written on these aircrafts.

Italy[5] The willing of Cobelligerent Italian Air Force to fight against germans (missions in Italy were generally avoided because fratricide fight weren't well seen by Allied command, so Balkan was the operational zone) sent this airforce to put on first line all Re.2002s and Macchis that it was possible rescue on southern airfields. But these aircrafts were quite worn out and without any industry in the south capable to make them and replacements parts. So these machines dropped quickly in efficency.

When W.Churchill claimed that italians had fought well and needed modern aircraft (24 may 1944, at common's room), british allowed italians to fly on the old ofe, Spitfires. Also americans given some aircrafts: 223th Group leaved P-39s and went on P-47s, so italians were allowed to take these fighters. Totally, atleast 150 were taken on charge, among them, almost all N and Q, but also atleast one L and 5 M. This happened on june 1944. The traing of the 4 Stormo pilots was started and the Airacobra was put in action. N versions were over 200 hours old and dedicated to training, while more modern Q were put on first line. Atleast 19 accidents occurred while italian pilots tryed to take these aircrafts on operational status, among the victims, 25 august, Teresio Martinoli, an 22 victory ace, killed by an allied aircraft after 4 years of air battles.

The 3 groups of 4 Stormo were trained in a small and difficult airfield near Vesuvio, then sent at Galatina airfield in the fall of 1944. 18 sept was the first mission in Albany by a 12 group's P-39. Almost 70 aircraft were operational and until 30-40 at once were sent on balkans. Only november the continous action of strafing of P-39s caused heavy destructions on german side with 1700 hours of flight. Germans almost hadn't aviation, but a fierce flak reaction and accidents caused 10 losses and numerous damaged aircraft. Even if the sturdy and well armed P-39 was almost ideal on ground attacks, these losses weren't few for a single Wing.

After the war in whic almost 3000 flyng hours were made by 4 Stormo, still dozens of P-39s were in charge. 1 april 1946 the remaining 46 P-39s still efficients were sold to Italy at 1% of their cost. Those summer many accidents happened, even mortals. Only n 1947 4 Stormo had P-38s, and P-39s were sent at traing purpuse only, until 1951. By all those italian Airacobra only a T9 gun survive today at Vigna di Valle museum (for all these informations see Marco Gueli's article in the references).

--Stefanomencarelli 14:47, 2 August 2007 (UTC)

Department of airacorrections

I deleted

"by the Navy in favor of the infamous Brewster Buffalo instead"

as factually wrong (the F2A wasn't named Buffalo by the Navy, & it was to a 1934 program, which even a cursory glance at F2A would have shown...) this

"(which coincidentally also featured a single-speed, single-stage supercharger)."

as irrelevant (especially since single-speed, single-stage superchargers were about as uncommon on period fighters as VW Type 1s on L.A. streets in the '60s (& '70s &...). Also this

"fired with a 900gr ammunition at 610 m."

as hopelessly unclear, & this

"P-39's 1,150hp (at takeoff; 1,014 hp at 6,100 m) V1710 had a single-speed, single-stage supercharger, which brought about a decrease of performance compared to the promising prototype fitted with an exhaust-driven turbo-supercharger"

as wrong or misplaced, & this

"ordered in production but were only capable of 600km/h at 6100 m, with a climb to this altitude in 7.5 minutes."

as extremely questionable. That sounds to me like a rate of climb more like a Spit or 'stang... Oh, & while I was at it, I rewrote. Ta. Trekphiler 15:16, 21 August 2007 (UTC)

Portugal

This section is way too detailed for inclusion as only 19 a/c are involved. I suggest a sub-article and a brief note on Portugal's use of the aircraft remains. What say you? FWIW Bzuk 23:31, 6 September 2007 (UTC).

Support having a much briefer Portugal section. Binksternet 23:42, 6 September 2007 (UTC)

Support. The present text is too detailed even for Portuguese Air Force and belongs in a separate article. Grant | Talk 01:04, 7 September 2007 (UTC)

Support. Indeed, sorry about that, I was using a book and a website as a reference to create List of aircraft of the Portuguese Air Force, when I found detailed information about the P-39 operational history in Portugal — and I didn't even use all the information :X. Maybe the current content could be moved to an article dedicated to the operators of the Airacobra, like many other aircraft have (i.e. List of C-47 Skytrain operators), or to a dedicated section in the List of aircraft of the Portuguese Air Force article.
Best regards, Get_It 02:10, 7 September 2007 (UTC)

Thank you for this comment. That is exactly the kind of Wikipedia editor that we want. My suggestion is not to cut out this section but to make it a separate article that links back to the main body. FWIW Bzuk 04:23, 7 September 2007 (UTC).

Half a year later and there's been no change to this section. It is still too large, giving undue weight to the very, very minor role of Portugal's few P-39s. Binksternet (talk) 14:47, 16 May 2008 (UTC)

I took a butcher knife to the section, deleting its tables and trimming much of the detail. Hopefully, enough of the meat remains to satisfy readers. Binksternet (talk) 18:27, 15 August 2008 (UTC)

Bicobra

Anybody got free-use images of the 2-seat RP-39? It'd be a great addition. Trekphiler (talk) 02:25, 22 January 2008 (UTC)

After Pearl Harbor

The statement "about 200 repossessed by the Army" leaves the reader wondering which army it was... US? UK? It should be made clearer. Binksternet (talk) 14:27, 16 May 2008 (UTC)

I fixed that. It was the USAAF, none went to 8th AF and the Soviets got closer to 200 than 250 planes. Markus Becker02 (talk) 12:20, 11 June 2008 (UTC)

No AP ammo issued to VVS

The statement about the Soviets issuing no armor piercing rounds for their P-39 cannon has no attribution. Where does that come from? Binksternet (talk) 18:29, 15 August 2008 (UTC)

No response for a couple of weeks; I'm taking the mention of AP rounds out of the article. Binksternet (talk) 17:00, 7 September 2008 (UTC)

Took it out again today after it was re-added by User:Resolution Man. Let's see the source for this claim... I'd like to put it back in if we can say it is from a reliable source. Binksternet (talk) 21:10, 30 September 2008 (UTC)

I have often typed in the fact that the USSR never used the P-39 for 'tank busting'...A FACT.....and yet it keeps getting deleted by WHO I don't know ...WHY would someone do that ???Resolution Man (talk) 18:35, 1 October 2008 (UTC)

I will get PROOF by contacting Tonopah Army Air Base historian and a tech book on the Airacobra ! Hang in there !! Frankly I would have left it in there and contacted me rather than keep ripping it out of the page over and over...oh! well ! —Preceding unsigned comment added by Resolution Man (talk • contribs) 18:52, 1 October 2008 (UTC)

I thought someone smart enough to know that the USSR never supplied there P-39s with a certain type of ammo, ever, and that no alternative ammo was ever used, and that P-39s did not attack tanks, ever, would know how to read the edit summaries and the talk page. Per WP's Reliable sources policies, any any info added must have reliable sources, or is subject to removal at any time. In this case, you weren't just adding a fact, but removing commonly known info which you claim is wrong. That sort of extrodinary addition/action needs verifiable sources. Also, the the threshhold on WP is not FACT, but Verifiability - anyone can claim anything on WP, so it needs to be able to verified independently. Hope that helps. - BillCJ (talk) 19:09, 1 October 2008 (UTC)

Thanks, Bill. Binksternet (talk) 22:20, 1 October 2008 (UTC)

I won't get into 'flaming' with you BILLY. And I am a newbie and have not read how to "talk" here on WIK...I just write what I believe to be true, in my way of typing ! I did not remove anything...my comments were removed !

I am not as informed as you....though I do believe you meant "their" instead of "there P-39s"....I am just a lad who has many interests and I "heard" and read "somewhere" about no AP going to the Reds.

I will search for what I 'believe' to be true !

STAY TUNED...you, too, Binky ! :):)Resolution Man (talk) 00:06, 2 October 2008 (UTC) —Preceding unsigned comment added by Resolution Man (talk • contribs) 23:49, 1 October 2008 (UTC)

You'll have more luck gaining consensus here if you avoid belittling other editors by adding 'y' endings on their names. Binksternet (talk) 05:20, 2 October 2008 (UTC)

I'm sorry we did not post a note on your talk page abput this, but it's not required, and I didn't think it was necessary, as I said. You seemed to know what you were doing, so we didn't think you were a newbie. You say you won't get into "flaming", and then that's exactly what you do, so it's obvious you know how to talk on forums. However, this page is not a forum, but specifically for improving the article. Please stop with the juvenile nicknames and typo-highlighting, and focus on supporting your claims with reliable sources. per WP policy. If you don't have any right now, then wait till you find them to respond. It's OK that you didn't know this before, but now you know, and that goes for the namecalling, et al, too. Thanks. - BillCJ (talk) 16:41, 2 October 2008 (UTC)

B and B : I am a newbie to the WIK and I am not used to the autocratic style I seem to have run into with you two. With that said, I will do my research and endeavor to get definitive proof to my claims but I must admit that it such an obscure item that I am a wee bit weary of all this banter and I am beginning to wonder if it is all worth it....I will get back to you if I feel like it. Case Closed !!! Resolution Man (talk) 19:05, 2 October 2008 (UTC) —Preceding unsigned comment added by Resolution Man (talk • contribs) 17:45, 2 October 2008 (UTC)

Obscure items can be fun additions to WP articles, they just need to be sourced. Good luck! Binksternet (talk) 19:25, 2 October 2008 (UTC)

Took me a year but I found that James Gebhardt's article on "P-39 in Soveit Use" states that M80 AP shot was NOT issued to the Soviet Air Force and therefore the Airacobra was NOT a tank buster...do a Google on P-39 to find his writings. I KNEW I read this before and now my info. can remain in WIKI's story on this aircraft and NOT be editied out. Q.E.D. !!!!!!!!!!!!! RESOLUTION MAN —Preceding unsigned comment added by Resolution Man (talk • contribs) 03:17, 16 October 2009 (UTC)

Took me a year but I found my 'back-up' info. that M80 ammo. was NOT issued to Soviet Air Forces in the writings of James Gebhardt "P-39 in Soviet Use", and thus it was a myth that P-39 was a 'tank buster'. I knew I had read it in a reliable source so do not edit my recent addition to WIK's article on the P-39. ( RESOLUTION MAN )

One, it's written very badly - do I have your permission to clean it up for you? Two, you need to give the publisher's information on the book (Publisher, location, ISBN, and year) and the pages where this info is found. Three, I think you posted this one section too low, so someone else might not get what you're referring to. - BilCat (talk) 03:23, 16 October 2009 (UTC)

It was Loza who authored this information. Gebhardt was the translator and editor, not the author. I corrected the book cite but we can still use a page number. Binksternet (talk) 15:08, 16 October 2009 (UTC)

• He probably can't count that high :P - BilCat (talk) 04:30, 17 October 2009 (UTC)

ONE...it's written very badly...now isn't that special......you "cleaned it up" without my permission....a year later and still you guys "rag on me"...BUT....I got what I wanted that the craft was NOT a tank buster, so I'm happy !RESOLUTION MAN —Preceding unsigned comment added by 98.207.203.232 (talk) 04:06, 17 October 2009 (UTC)

I didn't touch the new addition at all, so I don't know what you're talking about. Anyway, it's only one source. Other sources should be presented if they disagree, and are from reliable sources. - BilCat (talk) 04:30, 17 October 2009 (UTC)

I now see in the article section that NO AP being issued to the Russkies confirms my statements from months ago that this craft was NOT a tank buster...I am vindicated ! What a waste of time all those past months !...BUT.....I do compliment the mods. for 'eating crow'....Resolution Man (talk) 17:47, 18 November 2009 (UTC) And a tad more info. that the craft was NOT a tank buster : see www.chuckhawks.com/airacobra_iron_dog.htmResolution Man (talk) 01:33, 13 December 2009 (UTC)

The documentary I mentioned above said the Soviets loved the P-39. That 37mm was a great tank buster. The doc. is an ongoing series called "Great Planes" and can't dismissed out of hand. But I'm sure you'll do it anyway. —Preceding unsigned comment added by 74.46.23.27 (talk) 19:21, 20 April 2010 (UTC)

NO...it shan't be dismissed out of hand..it is simply that the show does not have correct information because NO AP ammo. was issued and an airplane cannot kill a tank without AP ammo.Resolution Man (talk) —Preceding undated comment added 03:03, 26 September 2010 (UTC).

Again "someone" keeps removing info re the myth of tank busting where I pass on info from the well known book "Attack of the Airacobras" re Soviet way of referring to"ground support" refers to attacking German bombers about to unload on Soviet troops below...and therefore not using the planes to 'tank bust' but to help troops on the ground by knocking out bombers above. I want to know how can I word such so that it won't be continually taken down !!! ????Resolution Man (talk) 21:44, 2 January 2011 (UTC) 1/2/'11

I do not think your English skills are sufficient to write a succinct entry about the myth of tank-busting. If you cite an author who "sheds light on the myth" of tank busting by P-39s, the article must already have introduced the fact that there was a myth. To kill the myth, you first need to describe the myth. Do you know who started the myth? Do you know what authors kept it going, which ones continued the myth? Do you have a timeline of the myth? I keep removing your Dmitriy Loza bit because of the absence of the description of the myth. Binksternet (talk) 22:34, 2 January 2011 (UTC)

OHHHH ! LORD! I KNEW it was going to be you, Binks etc.......The myth bit has been completely rejected...I was only adding confirmation from a Soviet POV. Just forget it ! You seem to want discourage folk and I have to say that you wore me down.....how you must be gloating !

You have not read Loza's book apparently, otherwise you would not have ripped my comments out of the text !

At least it is NOW accepted that the P-39 was NOT a tank buster and that was my goal more than a year ago and despite your skeptic style and 'deleting passion', I won the day and I'm done ! ...oppssss...I nearly forgot... your comment re my "english skills"...how rude of you...absolutely rude ! I do so want to make a ruder comment to you but I have restraint !67.180.96.4 (talk) 67.180.96.4 (talk) 01:31, 5 January 2011 (UTC)01:30, 5 January 2011 (UTC)Jan 4, 2011

P-39 Airacobra and XFL-1 Airabonita Inverted Timeline

William Green's book War Planes of the Second World War, Volume Four: Fighters. (Macdonald & Co. Ltd., 1961, ISBN 0-356-01448-7) and Bert Kinzey's P-39 Airacobra - in detail (Squadron/Signal Publications Inc., 1999, ISBN 1-88897-416-4) both state pretty clearly that the P-39 was not based on the XFL-1 Airabonita, but that the Naval aircraft was derived from the Airacobra and that the Navy's interest in the turbocharged XP-39's performance was a major reason the XFL-1 project was started in the first place. Additionally, the time the US Army sent the RFQ out on what became the Airacobra was well before the Navy's interest developed.

The fact the XP-39 flew two years before the XFL-1 is pretty telling as well.

This needs to be changed.

Bwob (talk) 10:04, 14 September 2008 (UTC)

I have the source that is listed after this claim (Donald 1997), and it contains no such info. The XFL-1 is only disc ussed near the end of the P-39 entry, and the XFL-1 is clearly stated as a derivitive of the P-39. - BillCJ (talk) 20:47, 30 September 2008 (UTC)

Quantum Of Solace

I believe the fighter plane pictured in the new James Bond film is a P-39. I could be mistaken, though. I'll wait for viable sources.

No, it is an Aermacchi SF-260.VaderSS (talk) 15:33, 28 September 2010 (UTC)

Airiacobra not sent to the USSR from the UK

In the section about Airacobras in the UK it reads:

The Airacobras already in the UK, along with the remainder of the first batch being built in the US, were sent to the Soviet Air force, the sole exception being AH574, which was passed to the Royal Navy and used for experimental work,

BX195 also remained in the UK... Or it's wreckage did at any rate, having crashed in what is now the Yorkshire Dales National Park in 1942.
http://www.allenby.info/aircraft/planes/dales/bx195.html and
http://web.ukonline.co.uk/lait/site/P-39%20BX195%20article.htm
I wonder if it's notable enough to add to the article, especially given the amount that was pulled out of the sink hole on the moor there. Also the Yorkshire Dales National Park Authority has a small bit of record about it on their HER (Historic Environment Record) although checking that would come under original research, hence why I linked to those two web-pages. If it's thought to be notable enough to put down that crash, or if no one says otherwise in the next week or so then I'll add it. --Tethran (talk) 09:41, 17 January 2009 (UTC)

NACA takes out turbo

Lots of good additions to the article lately, but none addressing the sequence of events leading NACA and the Army Air Corps' assistant fighter guy to take out the P-39's turbo, and thus relegating the plane to also-ran status in Western Europe where high altitude was key. Doesn't David Donald in 1997 have anything more to say about what the supposed performance improvement was? I know it was for better streamlining, but somebody needs to point out that the slightly better streamlining that was achieved at the cost of turbo was the death of the plane's original specs, and not really necessary. Careful airflow studies on the P-38 shaped its various vents and scoops into extremely low-drag forms—the same could have been done on the P-39 so that it could have retained its turbo. Binksternet (talk) 13:57, 13 May 2009 (UTC)

From what I can gather the aerodynamic improvements were made after the XP-39 was tested extensively in the NACA wind tunnel at Langley - the XP-39 was then rebuilt into the XP-39B. One of the modifications made was to delete the turbo-charger which was mounted under the centre-section. According to Bowers the decision to scrap the turbo was made by the Army in January 1940. The army did not envisage its fighters being used in anything other than a low altitude ground support role; unfortunately the Army was paying for the aircraft, so what the Army wanted, it got.

It could be argued that pointing out that removing the turbo was unnecessary is conjecture because it is difficult to know what improvements could have been made to the airframe had the turbo been retained. It could, for example, be argued that the position of the turbo in the lower centre section would have lead to problems with dirt and debris in operational service; considering the airfields that the P-39 later operated from this could have been very real - the P-38 turbos were on top of the tail booms, well away from the ground and the P-47 turbo was fully enclosed. Would it have been possible to redesign the installation to have made it less vulnerable? Possibly, but, again this could only be hypothetical- it didn't happen and, without anything solid to go on as to what modifications could have been made (eg; repositioning the turbo?) this can only be speculative. Thanks, BTW for picking up my errors! Twas late at night/early morning here in EnZed and I really should have been heading for the sack. By the time I'd gotten through with what I'd done..Minorhistorian (talk) 22:42, 13 May 2009 (UTC)

it's really a pity that P-39s werent' selected for carrier service. At least, there was no dirt and debrifs on carriers. In any case, apart the mechanical semplification there is no doubt (combat proof, not speculations) that P-39s were disavantaged by the lack of power at altitude. And this explains why V-VS fough with them effectively, while anglo-american not. With P-39s should had been a nightmare to protect a B-17s wing over Germany. Just like with Mustang 'A', after all.--Stefanomencarelli (talk) 21:36, 14 May 2009 (UTC)

The FOD issue may be overstated. We know today it's a problem for turbines, but did the AAC/AAF in '39? If so, how did the P-51 pass muster? TREKphiler ^{any time you're ready, Uhura} 20:14, 20 April 2010 (UTC)

At the time the only high-temperature material usable for the exhaust ducting to a turbocharger was stainless steel which is heavy. This would have increased the aircraft weight over that of the one without a turbo. A case of 'swings and roundabouts', more power from the engine, but more weight (and hence drag) for the engine to pull along. — Preceding unsigned comment added by 95.149.173.13 (talk) 11:55, 25 February 2017 (UTC)

More weight does not mean more drag. Binksternet (talk) 19:30, 26 November 2017 (UTC)

Weight isn't irrelevant to performance, but in this instance, the difference couldn't be more than a few pounds (if that); it shouldn't be perceptible. TREKphiler ^{any time you're ready, Uhura} 20:09, 26 November 2017 (UTC)

Interceptor aircraft?

I took out wikilinks to interceptor aircraft, as the intention of Ben Kelsey (as expressed in his book The Dragon's Teeth?) was to get a heavier fighter with a stronger punch, more capable of dog-fighting than the fighters of other nations. As defined at its article, an interceptor aircraft is for downing enemy attack aircraft such as bombers, but with a corresponding reduction in dog-fighting capabilities. Kelsey intended no such reduction, and the P-39 showed no such reduction. Kelsey used the word "interceptor" on paper to bypass Air Corps restrictions on the weaponry of pursuit planes. He did not think of the term as it is defined today. Binksternet (talk) 18:34, 5 July 2010 (UTC)

Overhyped in the US and the UK

I do not see that one article in Popular Science, "World's Deadliest Fighting Ship", can be extrapolated to support the notion that many British and Americans bought into the superiority of the P-39. It may be true, but what we need is an expert observer saying exactly that, not a link to a magazine article of the day. So far, no reliable source says that the Airacobra was over-hyped. I would like to see one. Binksternet (talk) 04:34, 16 September 2010 (UTC)

Dear Binksternet,

It is more than one article. It is the British themselves in states and reports. Below is what I was going to add (ie if you had waited just five minutes for that reference). Books have even states that. Bell did a lot of over hyping that cost lives. That I did not even go into. Yes, the Russians did good. I do not take that away. When I first reported that Russian archives that Professor Zaloga at last got access to after the fall of the USSR revealed the wanted the P-39 more for the air-to-air role than the air-to-ground as had been believed for decades after WW2 in the West I caught h*ll (along with the revelation that the Russians had Mig-15 aces during the Korean War). Finally, I believe it is time that someone else above our pay grade look into this issue. I don't get into editing wars. But this page is more a love-fest for the P-39 (ie it is a beautiful aircraft like the USN A-5 was, but sometimes looks are not enough). But I would like to insert a simple statement on how the RAF were originally going to order the P-39 (one 20mm cannon and four .303 machine guns all in the nose), but if that is not going to allowed for now, then please speak up. But I have the photo showing that one off model.

Jack E. Hammond

Note> What I was preparing to post with references when the revert was done.

One of the major reasons that the P-39 was found wanting with the UK and the US in the air-to-air role was Bell's over-hyping of the P-39 in ads and articles to the general public. Many pilots who flew the P-39 in combat were taken in by those ads and articles. A good example is the Popular Science, November 1941, article titled "World's Deadliest Fighting Ship" the first large article on P-39 published in US for general public. The very impressive cover photo showed the P-39 with one cannon in the nose and two machine guns in the nose and six more machine guns mounted in the wings. It was almost three years into the war before the general public in the US found out about the poor performance of the P-39 in air-to-air combat. The RAF in particular were upset over Bell's being less than honest about the P-39 performance. They were expecting a fighter that could easily achieve 400mph in combat. Even before the P-39 reached service with the RAF one unidentified author stated in the May 1940 issue of Aeroplane that the performance and weight of the P-39 "is not possible with the big motor, the shaft drive, the tricycle undercarriage, the armament specification and the range and wing load claimed" and that Bell "...must have discovered some wonderful new law of nature if they can build and aeroplane which weighs no more than a Hawker Hurricane, yet has more horse power, radiators in the wings, about 300lb more fuel, a cannon, a trcycle undercarriage, a long extension shaft and a constant-speed airscrew. ... The idea seems to be to get a spectacular top speed for advertising purposes anyway. When they are exported for War they have to be modified to make them lethal." (the last remark was meant as an insult by the British to Bell) Later when the first P-39 arrived in the UK for testing and the RAF asked for answers the USAAC officer sent to the UK with the P-39 stated "The loss of top speed from and alleged 392mph to 359mph can not be accounted for and will have to be addressed investigated in the USA." 'reference - Air Enthusiast/August 1971 The Calamitious Cobra Gordon Swanborough ISBN 0-385-08171-5 publisher Pilot Press Limited.'

Dear Binksternet,

Btw, I got to discuss the P-39 history with the USAAF/USAAC with a Major Marion F. Kirby of the 8th AF, 475 GG in the Pacific, and I asked about the P-39's nickname (ie the Klunker) and he stated did I want the nickname used around children or just adults. US pilots just did not find the P-39 lacking. They hated it. Besides its bad performance it lacked range due to the lack of fuselage space. All this Bell knew, but refused to pass on or acknowledge because they had put so much of their heart into the design. That is ok. Until it cost lives. Jack Jackehammond (talk) 05:38, 16 September 2010 (UTC)

Your reference of the 1971 article in Air Enthusiast is written by who? Do you have a copy of that issue? Binksternet (talk) 05:40, 16 September 2010 (UTC)

Dear Mr Binksternet, author Gordon Swanborough and yes I do have a copy. And can I post the information about how the RAF originally wanted to order the P-39 with all its armament in the nose -- to free the wing up for additional fuel -- or will it be reverted. Jack Jackehammond (talk) 05:47, 16 September 2010 (UTC)

Note> AE is took over from Royal Air Force Flying Review and then became what is today's AIR INTERNATIONAL and AIR ENTHUSIAST was for aviation history, till it was dropped about two years ago. Jackehammond (talk) 05:49, 16 September 2010 (UTC)

"But this page is more a love-fest for the P-39" Don't worry Jack. Exactly the same thing happened in the P-47 article.Flanker235 (talk) 12:15, 25 May 2012 (UTC)

IIRC there is some information on the RAF view of the Airacobra in the book Fly for Your Life, Larry Forrester's - who is better known as a screenwriter - 1956 biography of Robert Stanford Tuck who had flown Hurricanes in the Battle of Britain and who was attached to the British Air Mission in Washington shortly thereafter. I last read it over thirty years ago but I'm pretty sure it goes into some depth about the poor performance of the P-39. — Preceding unsigned comment added by 80.7.147.13 (talk) 13:07, 16 June 2013 (UTC)

Car doors.

Hudson Motor Car Company built the cabins and either based the P-39 and P-63 doors on their car doors or the doors may have simply been actual Hudson car doors. Bizzybody (talk) 10:03, 16 September 2010 (UTC)

I doubt very much that ordinary car doors, which in most American vehicles of the 1930s and 40s would have been sheet steel pressings, would have been used; the design of the doors was Bell's, they were made of lightweight alloys, and Hudson were simply the subcontracters selected to manufacture these components.

Have you a reference to Hudson building the cabins and doors? It would be an interesting addition to the article. Minorhistorian (talk) 10:27, 16 September 2010 (UTC)