Mad Rocketeer
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Can JB Weld be amended like epoxy? Fillers? Hardeners/Strengtheners? Balloons? Can it be rendered more sandable, lighter, less brittle, more heat resistant, etc.?
Originally posted by Mad Rocketeer
Can JB Weld be amended like epoxy? Fillers? Hardeners/Strengtheners? Balloons? Can it be rendered more sandable, lighter, less brittle, more heat resistant, etc.?
Originally posted by Mad Rocketeer
My thought was to possibly use JB Weld for my LOC Graduator's fin-tab-to-MMT and CR-to-MMT joints and fillets, since these locations are likely to get pretty hot. My understanding from other posts here is that epoxy will or may weaken over time under such exposure. I think Aeropoxy makes a high temperature resistance (~500 F) epoxy, but I doubt I could justify the cost.
I'd use Bob Smith 30-minute epoxy for the fin-tab-to-CR, CR-to-body-tube, and internal and external fin-to-body-tube joints and fillets.
For the external fillets, I'd make the initial fillet hard and strong but relatively small. Then I'd go over the top of it, before it cured completely, with the same epoxy with microballoons added. Alternatively, this outer fillet could be done with Fill-N-Finish.
Will JB Weld be good for this application? Is it necessary? Will it be too heavy? Too thick?
Originally posted by stymye
I have never lost a fin joint to heat,Imoh that is rare with epoxy.
Originally posted by stymye
large fillets are for looks more than strength and degrade performance(increase interference drag)
Originally posted by stymye
you can glue the rocket together with minimal amounts of plain ole epoxy and no nose weight .anything beyond that is just weight and cosmetics and more effort ,but results in a pretty rocket
no need to over-analyse it MR, winter is coming. just grab that glue bottle and start building.
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