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Note that Report 331 references the aoa to the bottom of the wing rather than to the chord line that is used today.

The Pioer drawing doesn't specify the leading edge radius. I like yours better than mine, so changed my nose radius to match yours.

I would like to edit my previous post, but can't. Piper Leading Edge Skin Drawing# 10630 has some good coordinates. Sta 3.150 upper surface is called out as 4.936", but only 4.990" will fit (this...

Check my post #35 for a photo of a photo of the Dakota Rib laid over Kerri-Ann's drawing and with my copy of the leading edge skin done from coordinates from Piper DWG # 10631 (and another drawing...

I'm referring to the upper surface ordinate at Station (abscissa) 3.15
The draftsman mislabeled that ordinate as 4.036 when it should have been 5.036
He drew the ordinate at 4.81, and that is what...

If your wings were trying to roll level, you were stalling out of a slipping turn. That is not a moose stall.
A moose stall is out of a skidding turn, and the low wing tucks under. Much less time...

I found the Piper error of 4.036 vs 5.036 at the location of the concavity to be the most interesting. That goof did actually hurt the performance of the wing.

I was well aware that it is a Dakota rib. I used it because it was also used earlier in this thread and because it is wrong.
I haven't been out to the airport to pick up a Piper rib to compare it...

I overlaid an AutoCad drawing of the leading edge skin (from printed dimensions on the Piper Drawing) over the photo of the nose rib that was posted above. Both had issues and neither matched the...

By cord, are you referring to the chord (the distance between the leading edge and the trailing edge)?
Is it different between the 3 and 12 ?

I'm installing tile in the washroom today. Will get back in more detail later. In the meantime, as just one example, on different Piper drawings, the leading edge radius varies between 1.00 and...

The AOA of the USA35b and USA35bMod were referenced to the bottom of the wing, not the chord line as is done now. That's the reason for the seemingly high stall angle.

The coordinates of the...

Jim, what's your present compression ratio? What compression ratio would you like to use?

I'll run the numbers on the power increase.

C85 pistons on an O-200 crank give 8.68:1 for about a 7%...

Since carbon fiber is brittle, how do you repair them when they bust?

Anbody ever put winglets on a Cub?
If so, what wS their design crossover altitude?

I wonder that too. If you can read an AutoCad DWG or DXF file, I can send you a drawing.

Fly it.

They were only red in the movie.
They were silver in the book.

I buy 4x8 sheets of kydex from Norrel Plastics and Cadillac Plastics in Memphis.

Well, the only nasty habit I'm aware of is the rather substantial potential to stall one wingtip and aileron at low altitude with high power settings and high angle of attack while the other wingtip...

Well, it ain't legal to do it on a J3, but the published Continental power curves for the C85 go up to 3100 rpm. The 85 cam is similar in timing and duration to the O-200 cam, so the shape of their...

While we're on the subject of power and torque available from our favorite little engines, several O-200's have been mounted on J3's by 337 rather than STC in order to avoid the somewhat puzzling...

In the 11, on soft sand takeoffs, I just blew the tail up with throttle and down elevator so that the tail never touched. On landing, I used the tailwheel as a brake. I much preferred the back seat.

Dave, I'm glad you didn't find it to be an issue with that Cuby.

Tim can tell you the exact length. To quantify it, I'd need a few parameters on his specific plane. Qualitatively, I'd expect it to cost him roughly about a tenth or so of a mile per hour in...