Talk:Johansen CAJO 59

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Aviation: Aircraft

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Floats and boats

Not sure between planing (aviation) redlink and planing (sailing). The latter is analagous but not focused on leaving/regaining the water. Hull cross sectional shapes are very different: flat with boats and deep with floats/hulls. I left it red to point out that we lack (I think) an article on the important aviation subject of flying boat hulls and floats. Wasn't consistent, though, as I should have used step (aviation) or somesuch, rather than step which is just a DAB list and does not even mention floats! Do we have a flying boat/floatplane expert out in the harbour?

BTW, in producing this page I found that we don't have a category:amphibious aircraft, which surprised me. Perhaps it should be a subcat of category:seaplanes and flying boats? Maybe this needs wider discussion (as well as someone who knows how to do subcats; I can do cats, but couldn't see how to place them within another).TSRL (talk) 19:51, 4 September 2010 (UTC)[reply]

Thanks for your note! Cats have been such an issue in the past that I agree that you should probably take it to Wikipedia talk:WikiProject Aircraft to discuss first! On the redlink, in looking at it, I thought it was an unlikely stand alone subject but the blue link was the closest I could find. Perhaps this subject is worthy of a paragraph on hull design to be added to Amphibious aircraft? Feel free to change it back to a redlink or to write the article!!! - Ahunt (talk) 11:13, 5 September 2010 (UTC)[reply]

When talking about hulls, either boat or flying boat, the term planing means similar things. It's the difference between skipping over the surface and ploughing your way through the water. MOST flying boat hulls or floats will plane, (sometimes known as rising up on the step), at a certain speed in water at a given temperature/density, (some hulls notoriously refused to plane, usually due to bad hydrodynamics and lack of power). The major factor affecting the ability to plane is the "Step" design. It was found early on that floats or hulls tended to stick to the water and a means of breaking this suction was found in the step, which allows air under the sides of the hull bottom, as water speed increases, dramatically reducing the hydrodynamic drag and stiction.Petebutt (talk) 16:28, 5 September 2010 (UTC)[reply]