#11
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The E12 is perfect for a Super Big Bertha. When they first came out I bought a bunch of E12-4's that turned out to have the bad date code. I had a beat up old Super Big Bertha and I figured I wouldn't be too upset if a cato destroyed it, so I gave it a shot. I got a couple of beautiful flights before one of the E12's finally blew. The plastic nose cone softened from the heat of the fireball and it deformed when I picked it up. FWIW, I measured the fin thickness on the remains. They're 1/8" balsa.
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John Buscaglia NAR 27366 SAM 63 CMASS Member |
#12
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Thanks for the confirmation on the fin thickness. Were they slot mounted?
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Never trust an atom. They make up everything. 4 out of 3 people struggle with math. Chemically, alcohol IS a solution. NAR# 94042 SAM# 0078 |
#13
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They are surface mounted with gussets: |
#14
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When I built mine a million years ago, I ditched the gussets and just used epoxy fillets. The fins held up fine under composite E power. YMMV.
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John Buscaglia NAR 27366 SAM 63 CMASS Member |
#15
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Ah so! Do you have the rest of the instructions? None of the usual sites seem to have them.
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Never trust an atom. They make up everything. 4 out of 3 people struggle with math. Chemically, alcohol IS a solution. NAR# 94042 SAM# 0078 |
#16
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I think you just missed it, it is on the Estes site: Instructions SBB instructions: SBB Have fun with it, I built a modified Broadsword for an H contest and it still flies today, gussets and all. |
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