Fuselage

geo101
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Fuselage

Postby geo101 » February 22nd, 2016, 8:35 am

Is it possible to extend the fuselage of the glider by adding clay to one end or by placing the back fins beyond the end of the fuselage?

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Re: Fuselage

Postby vjindal » February 22nd, 2016, 9:02 am

You can extend the fuselage using a piece of sanded wood.
You will have to experiment with putting the "back fins"(by which I think you mean the horizontal and vertical stabilizers) because this will drastically change the center of gravity and change the balance of the plane.
Using clay to extend the fuselage is probably not a good idea because clay is flimsy and will probably fall off.
Good Luck!
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Re: Fuselage

Postby Fanglin » February 22nd, 2016, 2:32 pm

Yeah, you can have your fuselage any length longer than 32 cm.
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Re: Fuselage

Postby fifty_missions » March 15th, 2016, 6:13 am

Extending the fuselage towards the nose is a good idea but don't get excessive. Extending it another 20% should suffice, 50% is probably too much. How do you extend it?' Review the following process-

1) Find wood of the same size as used on the fuselage originally.
2) Position the new extension piece under the nose.
3) Cut a long angle cut through the fuselage and then indent the extension piece underneath.
4) Cut the extension on that same angle.
5) Check that the extension mates to the original fuselage with a flush joint.
6) Use a little five minute epoxy at the top and bottom of this new spliced joint with a little super glue medium viscosity in the center. Join the pieces and accelerate the joint (use an assistant?).
7) Once the joint is cured, wrap the new spliced joint with thread and glue.
8) Add new launch tooth assembly to the nose.
9) Add a layer of 1/32 balsa sheet, cross grain, to the new nose assembly as a lamination.
10) Use CA glue and glue a bead of clue to the very front of the nose. Let cure.
11) Check the center of gravity picking a point about 1/3 back from the leading edge of the wing. Check the balance.

Chances are that the nose may become heavy enough to be nose heavy and the glider dives. To counter this before you catapult launch, pinch the trailing edges of the stabilizer (sanded to at at least 1/32 or less!) and bend in a couple of degrees of "up" elevator. This will help the glider recover from a dive and also help in the transition. BTW, glue a smear of clay to the bottom of your launch handle so that you can can or remove clay from the glider as you trim fly.

If the glider stalls now, add a little more clay to the nose. The amount of clay may be deceivingly small to have a glider flying "like its on rails".

Good Luck,
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