On 11/23/2022 12:31 PM, larry howell via KRnet wrote:
Our Dallas EAA chapter had a NASA engineer visit our chapter with
videos, photos etc many years ago. He said most of the drag on an air
cooled airplane is engine cooling and that a tapered wing gained you
nothing until well over 200mph
Probably why Vans Aircraft models have constant chord wings. If ribs
are being punched out of aluminum one block for each wing I guess.
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I can't find the article back that I read years ago that basically said
the same thing and the RV builder kept making his cowling inlets smaller
until they were as small as possible and still give good cooling. Based
on that I , very unscientifically , reduced my cowl openings by several
inches. They now measure 3"X5" with adequate outlet openings and I have
excellent cooling. I could probably go smaller but I'm happy with what
I've got.
On wing tips, I used a process that allowed me to easily duplicate the
tips. They turned out to be "Horner" tips and work quite well. I have
a 3 degree washout in my wings as specified in the plans and a video I
made with yarn strips taped to the wings showed Zero turbulence at the
tip in a power off stall. I can elaborate if anyone is interested and
someone could post the video. I'll send photo on separate post.
Larry Flesner
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