delta22
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- Joined
- Jan 21, 2009
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Using West Systems 206 slow epoxy for all structural bonds, so each step requires an overnight cure.
Started the build last Sunday and want to launch it at CMASS' final launch, which gives 13 days to build and prep.
In these first five days, have:
1) bonded 2 CRs to motor tube - pic 1
2) bonded this assembly to airframe
3-5) tacked fins in place with CA, then completed internal and external fillets - pics 2-3
Fins were sanded with 120, then 220 grit to soften and smooth bevels.
Fin roots and all bonded areas roughened with 80 grit.
At R. DeHate's, of AMW fame and fortune suggestion, using 1/2 in braided Kevlar for internal fillets. - pic 4
Saturate Kevlar with epoxy, pour a small amount of thickened epoxy in for good measure and then press Kevlar into place with a thin stick.
Never done this before and it works like a charm.
Then immediately follow with external fillets with thickened epoxy.
Also prepped CRs with small U-bolts for retention. - pic 5
U-bolts are 1/4" dia stock, sold in cable crimp assemblies.
U-bolts are off-center because each CR already had a 1/4" hole in its center.
Also leaves more room for ejection charges on alt bay covers.
Started the build last Sunday and want to launch it at CMASS' final launch, which gives 13 days to build and prep.
In these first five days, have:
1) bonded 2 CRs to motor tube - pic 1
2) bonded this assembly to airframe
3-5) tacked fins in place with CA, then completed internal and external fillets - pics 2-3
Fins were sanded with 120, then 220 grit to soften and smooth bevels.
Fin roots and all bonded areas roughened with 80 grit.
At R. DeHate's, of AMW fame and fortune suggestion, using 1/2 in braided Kevlar for internal fillets. - pic 4
Saturate Kevlar with epoxy, pour a small amount of thickened epoxy in for good measure and then press Kevlar into place with a thin stick.
Never done this before and it works like a charm.
Then immediately follow with external fillets with thickened epoxy.
Also prepped CRs with small U-bolts for retention. - pic 5
U-bolts are 1/4" dia stock, sold in cable crimp assemblies.
U-bolts are off-center because each CR already had a 1/4" hole in its center.
Also leaves more room for ejection charges on alt bay covers.