Dick Johnson's wing flattening jig?

On Aug 22, 2:15*pm, Brad wrote:
On Aug 22, 10:12*am, wrote:





On Aug 22, 12:15*pm, Bob Kuykendall wrote:

On Aug 21, 2:55 pm, ryanglover1969 wrote:

Very interesting indeed!

Blather aside, I'm thinking that the tool in question is a waviness
gauge such as the one I made for checking plugs and molds:

http://www.hpaircraft.com/hp-24/upda...october_04.htm

My experience, backed by template checks on a variety of sailplanes,
is that getting the waviness below .004" is a lot more important than
making the airfoil exactly match the intended contour.

Thanks, Bob K.

http://www.hpaircraft.com/hp-24

BLATHER! You call JJ's safety device blather?
Geez. It makes as much sense as a lot of what I read on here.
It's raining and I'm stuck in the shop. This is my only relief so
humor me.
My experience differs from yours. A wave free wing with the wrong
contour may , and commonly does, result in a smooth P.O.S. *A lot of
ships, particularly older ones, don't have the leading edge contour
correct. This can have a larger effect on performance than waves.
And- once you put the gage, or in my case my hand, on the wing and
find a wave, how do you decide what to do about it? *The obvious
answer is sand the high area off. As often as not, this is the wrong
thing to do.
Sanding wings is pretty much the last thing you do to improve
performance, after doing all the other things that are easier and less
likely to go wrong.
UH

Hank, are you a Jedi at the LE sanding board wrist flip? Someday I do
hope you can look at my HP-24 wing and see what you
think.................the LE is indeed a very difficult area!

I'm far from bored today: I've already sanded the primer down to 150,
applied several brush dabs of primer to some small craters, and now am
about to make up a bunch of Mousebgone................which is how I
pay for my soaring addiction(s)

Cheers,
Brad- Hide quoted text -

- Show quoted text -

Only the most worthy are taught the secret of the leading edge wrist
flip. The rumor that it resembles ordering another Bud Lite are sadly
just that- rumors.
UH