There
is no sail shape difference between a proa or normal boat, fore and aft
is the same as a tack (or Gybe) lift from one side then the other.
when the boat shunts the camber curve of a non symmetric foil is on the wrong side one way or the other
Oh
you also seem to be a little confused on airfoil numbers. The NACA
00XX are all symmetrical, the xx portion is percentage of chord at the
thickest point. If there are numbers in the 00 portion then it is an
asymmetrical foil.
Yes, but they are always angled lower than the main wing, 4˚ typically. When I built my first airplane I reduced that angle thinking that it would improve the top end performance, it didn't and it hurt the landing speed (stall point). It is kind of bad if they both stall at the same time....... Ask me how I know.
no I understood that, for some reason when I looked it up I managed to drag up a cambered profile and was too tired to notice
Yes, but they are always angled lower than the main wing, 4˚ typically. When I built my first airplane I reduced that angle thinking that it would improve the top end performance, it didn't and it hurt the landing speed (stall point). It is kind of bad if they both stall at the same time....... Ask me how I know.
thats not necessarily true, in any event a low tail will likely be in the wake of the mainplane, but also the wake of the prop (single engine)
The
designers goal when it comes to the tail is to get minimum drag, ALL
the lift should come from the main wing. The tail is just there to help
with pitch and yaw occasionally : )
there are lifting tails too, aircraft like Hercules may need to bear some load due to inappropriate CG balance even if it is momentarily, such as in an airdrop Indeed the common position for most large aircraft will have tails that need to compensate for CG shifts due to their operational circumstances.
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Posted by: robriley@rocketmail.com
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