Gliders > Slope Soaring
West Wings Skylark build thread
angry_muppet:
The answer is, no I hadn't glued the brace. I wanted to check the fit and alignment before I would do that.
There isn't anything that is protruding that is causing the wings to rock. Everything seems to be A-OK.
A full depth brace sounds like a reasonable idea; I have 1.5mm ply blank which I could use. Obviously 3mm is stronger... And heavier... The question is does the build warrant a 3mm brace when the ribs are all 1.5mm?
Spanner:
Hi,
Its the spar that takes the wing load not the ribs they are there to give it shape and support leading and trailing edge. You could use 1.5mm good quality ply as that is what is proposed on the plan. However if you are unsure of the quality of the ply use 3mm hard ply not light ply. The root ribs should also be glued together as the dihedral brace is intended to transfer the wing loads along the spar, it is not intended to take torsional loads or prevent the wing from twisting, this may be the issue you were having while braking the braces that you have already installed. The use of bandage that I suggested would reinforce the but joint at the root ribs without going overboard on weight or strength.
Joe
Happy Days:
If the wing joiner had broken due to a heavy landing or such like I could understand it breaking, but this model has never flown.
Before modifying the plane, my desire would be to find what is causing suffieient stress to snap the joiner while the model is still on the bench.
K.
angry_muppet:
One question, which may be irrelevant...
Does it matter how the retaining elastics are fitted? I had them perpendicular to the span. Would it make a difference if they were fitted diagonally? As in, forming an X across the centre of the wing?
Happy Days:
You'd normally use 4 bands David. One, (on each wing half,) would be parallel to the fuse, and the remaining two would form a cross. The amount of "stretch" of each band is normally somewhere in the region of 20 - 25%. So if the root chord of the wing is 10 inches (distance from the front to the back of the wing ) use a band that was 8 inches long when 'relaxed'. There is no hard or fast rule on this but for a non aerobatic model like yours all the bands are really doing is holding the weight of the fuse when the model is in flight.
One of the benefits of banded wings is that on a heavy landing the bands snap rather than the airframe breaking.
K.
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