Rob Riley; "One major downside is, what happens if high winds are encountered with a faired deck?
If it is an ogival form across the deck, the not insubstantial area would provide a lot of lift, possibly getting the machine right out of the water. Ogival forms cut from a the arc of a circle have the capacity to provide lift in both directions and they always have positive angle of attack both ways."
That is precisely what I intend to build as a Harry Biplane, with an ogival (thanks for the word) structure on the bridge deck for a living space (cruising).
But you are right, it would generate a lot of lift in high winds, exactly when I don't really want the lift...... The wife might be unhappy with me if the boat started flying while anchored, during a microburst. I don't even want to think about a cyclone and worst of all there may not be a safe direction to turn the boat, to reduce lift. Solar panels as spoilers maybe?
As a cruising boat though with two diesel engines and fuel, etc. I suppose some lifting calculations are in order. I might have to accept that the boat will fly and flip in very high winds, just have to get some kind of an estimation of how high.
Back to the aerodynamic drag though, it occurs to me that just like with an airplane, every reduction in drag directly increases speed. Just like the suction you mentioned there are things like round stays that are incredibly draggy and all the stuff cluttering the surface. like people : )
Talador
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Posted by: taladorwood@yahoo.com.au
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