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  #11  
Old 07-25-2016, 06:34 PM
jbuscaglia jbuscaglia is offline
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Quote:
Originally Posted by erik442
I just finished a clone of the SBB and went with 3/16" balsa covered in paper with TTW mounting. I build almost everything with basswood fins but have been experimenting lately with laminates. I'm gonna give it a retro inspired paint job and fly it on E-12s.


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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  #12  
Old 07-25-2016, 08:16 PM
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jeffyjeep jeffyjeep is offline
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Quote:
Originally Posted by jbuscaglia
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.


Thanks for the confirmation on the fin thickness. Were they slot mounted?
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  #13  
Old 07-26-2016, 05:48 AM
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Quote:
Originally Posted by jeffyjeep
Thanks for the confirmation on the fin thickness. Were they slot mounted?


They are surface mounted with gussets:
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  #14  
Old 07-26-2016, 07:30 AM
jbuscaglia jbuscaglia is offline
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Quote:
Originally Posted by 5x7
They are surface mounted with gussets:


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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  #15  
Old 07-26-2016, 03:41 PM
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Quote:
Originally Posted by 5x7
They are surface mounted with gussets:

Ah so! Do you have the rest of the instructions? None of the usual sites seem to have them.
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Old 07-26-2016, 05:44 PM
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Quote:
Originally Posted by jeffyjeep
Ah so! Do you have the rest of the instructions? None of the usual sites seem to have them.


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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