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Old 12-28-2009 | 03:34 PM
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chemie
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From: middle of , MI
Default RE: GP Extra 300S - Group Winter Build

Stab: Moved hinge line 1/2" and extended basswood front stab spar all the way across per Adrian's suggestion. Of course, this used up that material so I had to use some shop balsa for the rear stab spar. Since it is sheeted, I do not think there is a strength penalty to using balsa instead of basswood. (Photos #1 and #2)

Elevator: I was not able to extend the TE by 1/8" because of the availability of wood for the 5/16" x 1" x 12" piece. This is used for the elevator root ends and also the bottom of the rudder. With extending the root ends by 1/2" each (1" total) and adding 1" to length of the bottom rudder, there is nothing to spar; I had to cut very carefully to ensure enough material to go around.

Also, I wanted to use some 1/4" triable stock for the hinge lines (saves sanding down the "V" into the LE). So, I built the elevator using the plans, except for the tips and CB (Photo #3 and #4). I removed the stab, added the 1/4" triangle stock, and then re-attached the stab to allow fitting the CB. I used pins to keep a small gap around the CB. Finished unit Photo #5 and #6. Photo #7 shows the triangle stock.

Photo #8 shows the gap restored to the original 7/8", although adding the triangle stock reduced this 1/8" since I had not accounted for when drawing the locations so I ended up in between the original and Adrian's distances.

Photo #9 shows the current gap on the CB...what is the right gap prior to covering? I assume 1/16". Also, do you need to remove any edges from the CB to allow it to swing? (i.e. similar to the "V" like a hinge line)???

Still sheeting the stab so that photo to follow. Working on the rudder right now.
(Sorry about the photo size, I did it the same way as before (which worked) but now they are big!)



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