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To avoid that torque, the lug would be at the CP, so not using up as much of the rod as it would at the CG. But I agree with the two lug answer anyway.Launch lug with a piece of plastic tube stand off, for middle tube. These extra long rockets need ((IMO) two lugs, as the wind blowing while this is on pad will create a destructive torque with a single tailward lug. But if you put a single lug at the CG; you have already used much of your rod.
That depends entirely on what "plastic cement" you mean, and what plastic the tubes are made of. Tester's red label is solvent plus polystyrene filler, so it works where 1) the solvent is effective on the work pieces and B) the work pieces are compatible with polystyrene after the solvent evaporates. Both conditions are obviously met when the work piece is polystyrene, which is what the stuff is meant for. With anything else, it needs testing. The story will be similar with other glues meant for other plastics (e.g. the stuff for PVC pipes).i am wondering if I should have used plastic cement, probably would have fused the parts and sanded better.
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