[RocketsNW] Fins on a Minimum Diameter

[Scott Berfield]

Cool idea. I'll have to try that next time.

-----Original Message-----
From: rockets-bounces at rocketsnw.com [mailto:rockets-bounces at rocketsnw.com]
On Behalf Of Mfreptiles at aol.com
Sent: Saturday, January 30, 2010 9:16 PM
To: rockets at rocketsnw.com
Subject: Re: [RocketsNW] Fins on a Minimum Diameter

JB Weld with milled fiber.  You'll need the Industrial sized  tubes, not 
the little ones.  
 
Lay it in heavy on both sides of the same fin, then press 1" pvc pipe into  
both fillets until it squeezes out the ends.  Then rubber band the pipes  
together and then rubber band them to the airframe on both ends.  When the  
JB Weld is totally cured, tap the PVC pipes off with a hammer and smooth out

the  squeeze out with a drum or flap sander on your Dremel tool.  You can do

all  the fillets at the same time if you have enough PVC pipes cut and some 
 coordination.  Perfect molded fillets with just a little work to fair them 
 in at the ends.
 
You can tip-to-tip glass over the top of that or not.  I've tested it  to 
mach 2 without any overlay.
 
I've done the same thing using Bondo, but it is non structural and  
polyester does not stick to epoxy composites so well.
 
The JB Weld sands easily enough anyway.  Wear a mask.
 
Mike F.
 
 
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