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Building Tips and technical articles. => Building techniques => Topic started by: James Mills on July 19, 2010, 06:34:51 PM
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I'm planning to build a Junar (Bill Werewage design). The fuse aft of the trailing edge of the wing has cut outs between the formers. What should I cover these openings with (silkspan, polyspan, or...)?
Also, does anyone know the wing area of this design (I've read the article and didn't find it)?
Thanks,
James
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H james,
I use silkspan on the windows. haven't tried polyspan, but it WOULD be more durable. The Junar is in the high 600 squares. it is basically a USA-1 wing, and the USA-1 is advertised as 700 squares. The thin airfoil works best if kept fairly light. Billy's were in the low-mid 50 oz. range.
Big Bear
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Whatcha gunna use for power ??
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Whatcha gunna use for power ??
Plan to use PA 61/pipe (unless I decide to crossover to the dark side and use electric #^). I got to talk to Billy at the Nats and he said that would be a good set up, I just didn't think to ask him the wing area or how to cover the fuse sides.
James
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I'm planning to build a Junar (Bill Werewage design). The fuse aft of the trailing edge of the wing has cut outs between the formers. What should I cover these openings with (silkspan, polyspan, or...)?
I would probably use silk or silkspan over polyspan. I would be very concerned about getting a hole poked in it.
Brett
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just iron on some SLC - then cover as usual - tough as all getout and light too!!!!
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The SLC sounds like a great idea. For some reason the polyspan we used to cover a RD-1 profile fuselage seemed to get real heavy.......
I am getting the SLC (never used it) simply because I have heard so many good things about it. And it seems to be the lightest thing to use under silkspan.
Like Brett said, it IS easy to poke a hole in those windows! ;D
Big Bear
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I would probably use silk or silkspan over polyspan. I would be very concerned about getting a hole poked in it.
Brett
This is a short kit I bought off Stuka and the side cutouts are laser cut as well, otherwise I probably wouldn't have cut them out.
James
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Really! How much weight can be saved by cutting out a few square inches of fuselage side, and then covering with tissue? Seems like an exercise in futility!
Floyd
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Really! How much weight can be saved by cutting out a few square inches of fuselage side, and then covering with tissue? Seems like an exercise in futility!
Floyd
LL~ LL~ LL~
Hi Floyd,
Because air is lighter than wood! LL~
I know that you know Billy Werwage. To say that he is obsessed with keeping weight down is an understatement! Check out his P-47 "Geo Bolt" plans. he doesn't cut windows back there, but he carves/sands the fuse sides from the inside to about 3/32nd or 1/16th.
Like it has been pointed out to me, every ounce becomes 10 ounces when we are doing maneuvers. And weight at the tail is not usually good, since it takes a LOT more weight up front to balance everything.
GMA did the *windows* on the '57 GB Nobler, so that has been around a LONG time.
I won't argue with Billy until after I get my 4th World Championship in F2B. ;D
Bill