Message #663

Date: Oct 15 2000 22:05:05 EDT
From: "MotorcycleShopper.com" <mshopper@cfl.rr.com>
Subject: Re: Fig. 1-7 Detail C

At 07:51 PM 10/15/2000, you wrote:
>FlyBaby
>
>Luis, No, uprights at sta 3 and 5 are not straight up and down--- they
>must line up with the angle that the front and rear spar of the wing
>will be at once the incidence angle has been determined, the inked-in
>measurements are not right on fig 1-1.
>The way that I did it is to make up a cardboard full-size rib--position
>it at the propper incidence angle--then draw a line perpendicular to the
>bottom of the wing extending up to the top longerons.
>This will assure the correct angle of the uprights at sta.3 & 5.
>
>"Steze"
>http://community.webtv.net/smlangford/StevesFlyBaby


Hi "Steze":

thanks for the fast reply.

I did something similar to what you suggested but I used tracing paper so I 
could see where the spars (from the wing rib template) would fall when laid 
over the fuselage drawing. Well, there was no way this thing was going to 
fit. Period! So, I started reading section 8 of the builder's manual and 
came up with the following note on page 8-7:

"For fuselages built to corrected drawings, the bottom of each spar should 
be just about even with the bottom of the lower longeron."

It then goes on to say:

"Measured relative to the top of the upper longeron, the bottom of the 
front spar should be between 3/4" and 1-1/2" ABOVE the bottom of the rear 
spar, preferably the greater dimension."

So your approach is right on as the final position (or angle) of the 
uprights at stations 3 and 5 is set by the angle of incidence.
You would think that a note somewhere in section 1 pointing to the notes on 
section 8 would make sense; but I guess that would take the "fun" away.

Back to the garage to make a full-size cardboard template.

Thanks again!

Luis Hernandez Jr.
CEO
Payne Corporation

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