Talk:E-Ship 1

Mechanical link or steam engine?

In the first paragraph it is said that "four large rotorsails that rise from its deck are rotated via a mechanical linkage to the ship's propellors". To me that sounds as if there is (roughly speaking) a shaft connecting propeller and rotor. But in the last paragraph it is said that "[T]he ship's exhaust gas boilers are connected to a Siemens downstream steam turbine, which in turn drives four Enercon-developed Flettner rotors." Now that doesn't sound like a mechanical linkage at all.

Am I just stupid or is that a contradiction? Einer 92.79.162.10 (talk) 10:43, 13 December 2012 (UTC)[reply]

Am not 100% but I think that ship engine (not propeler) start turning the rotors, then wind increases that and causes propulsionPawlin (talk) 12:16, 23 October 2014 (UTC)[reply]

The rotors are driven by a motor, not the wind (although Wikipedia did used to say that, thanks to a clueless editor). They were first driven by a petrol engine. Recent ones have been driven by electric motors. The electricity for these is either supplied from a central grid supply, or else generated by a dedicated steam turbine generator set. The steam for this can be produced by a heat-recovery boiler, heated by diesel engine exhaust (this is an old idea anyway). I know of none that are driven directly by turbines, as it's easier to connect the machinery space to the rotors with electrical wiring than by steam pipes. Andy Dingley (talk) 12:59, 23 October 2014 (UTC)[reply]

Flettner ship or rotorsail?

These are not the same thing; there are articles on both on wikipedia. Both utilize the same concept, bu are not the same. I believe this is a Fletttner ship, thus its cylinders should not be referred to as "rotorsails". .45Colt 16:07, 26 September 2014 (UTC)[reply]

The term is usually given as "Rotor Sail", but that's probably a trademark. I know of no reason why this isn't the same as Flettner.

Turbosail is the one that's different. Andy Dingley (talk) 12:52, 23 October 2014 (UTC)[reply]

How many engines?

The "Propulsion and machinery" section says it has nine diesel engines with a total of 3.5 MW of power, plus the steam turbine. Sidebar says there are two engines with 3.5 MW each. — Preceding unsigned comment added by 66.241.87.54 (talk) 06:12, 28 June 2015 (UTC)[reply]

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Power of the electric-motor of each Magnus rotor

Hello to you. I took in hand and largely fleshed out the French article Effet Magnus (This article is very different from yours since it speaks of the real Magnus effect and not of the theoretical Magnus effect which has little meaning). I am looking for information on the Coefficient of Friction $C_{f}$ of the Magnus rotors. S. F. Hoerner (in its "Drag") predicts a $C_{f}$ of 0.003. Which fits quite well with the $C_{f}$ which can be deduced from the 2D cylinder of the NACA TM 323 of Ackeret. Unfortunately, the text EXPERIMENTS ON A FLETTNER ROTOR AT CRITICAL AND SUPERCRITICAL REYNOLDS NUMBERS, Bordogna, Muggiasca, Giappino, Belloli, Keuning, Huijsmans and van ’t Veer, advertises a $C_{f}$ of 0.006 for the fairly large "Delft" 2D rotor in windtunnel. This value is very surprising. Result: all you have to do is see what is practiced in reality! Do you have the maximum power of the electric motors of E-ship 1? Thanking you, Bernard de Go Mars (talk) 15:08, 28 December 2022 (UTC)[reply]

I just calculated the

C_{f}

on the single Magnus rotor of the MS Annika Braren. The rotor is 3m in diameter and 18m high. Its motor burns 75KW of power and the max rotor speed is 280 rpm. This is enough to calculate the

C_{f}

of 0.0085. This takes us away from Hoerner's predictions... Thanking you again, Bernard de Go mars Bernard de Go Mars (talk) 15:48, 28 December 2022 (UTC)[reply]

I just wrote in the french article "Effet Magnus" :

"Specifications can be drawn from the range of five rotors offered by Norsepower Rotor Sail^[1] · ^[2] a very close

C_{f}

of 0.004 in order of magnitude^[3]. Friendly, Bernard de Go Mars (talk) 11:07, 31 December 2022 (UTC)[reply]

References

^ Norsepower Rotor Sail, brochure, [ttps://www.norsepower.com/download/brochure.pdf ] (just add the missing "h" to this link)
^ This brochure gives the nominal power of the electric motor used to rotate each rotor and the maximum rotational speed. It is therefore easy to derive from it a nominal $C_{f}$ that is quite dimensioning for the engineer.
^ Hoerner, meanwhile, advocated a Coefficient of friction $C_{f}$ of 0.003 in a Reynolds range between $10^{5}$ and $10^{6}$

[1] Norsepower Rotor Sail, brochure, [ttps://www.norsepower.com/download/brochure.pdf ] (just add the missing "h" to this link)

[2] This brochure gives the nominal power of the electric motor used to rotate each rotor and the maximum rotational speed. It is therefore easy to derive from it a nominal $C_{f}$ that is quite dimensioning for the engineer.

[3] Hoerner, meanwhile, advocated a Coefficient of friction $C_{f}$ of 0.003 in a Reynolds range between $10^{5}$ and $10^{6}$

[1]

[2]

[3]