The first time I saw the leading edge of a wing on an indoor free flight duration model rotated 45 degrees was on Emil Schutzel's A6, many years ago. He is not on this list, so I thought I would give him credit for the innovation & try to smoke out more discussion on how old this idea really is.
Gary Hodson
-----Original Message-----
From: upwind120_at_gmail.com [Indoor_Construction] <Indoor_Construction_at_yahoogroups.com>
To: Indoor_Construction <Indoor_Construction_at_yahoogroups.com>
Sent: Sun, Apr 3, 2016 8:02 pm
Subject: [Indoor_Construction] Re: Is there a simple way to lay out different camber arcs?
Banana ribs…after I find the sweet spot on the french curve, I mark the chord on it with a Sharpie a tiny bit overlength (the ribs will be cut to the correct length later in the process). Then I move a little further along the french curve, toward the straighter end, and mark the chord in a different color. That becomes the bottom contour of the banana rib.
Now I use the one template (the french curve) to cut tops and bottoms just by sliding it right and left on the blank. If I'm building a wing with a Gowan style front spar it's easy to make the front .08 (so I can notch it) and the back end .06.
I'm working on a P-18 whose plan calls for the top of the front spar to be radiused, presumably for aerodynamic purposes. This further weakens the most vulnerable stick in the whole model. Rolling the square stick 45º like OlBill does is the natural solution.
a.
Received on Mon Apr 04 2016 - 06:54:38 CEST
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