#1
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Epoxy fillet advice needed
I'm having trouble with the Apogge video technque of using expoxy putty for my Aerotech Initiator. I think I made the putty "snake" to fat to cover the edge of the fin and the body tube. I rolled it out and tried to spread it but it turned into a fat, globby mess. I need advice on how to make a nice concave fillet.
What advice can someone give on fixing this mess? For another fin, how can I make a nice concave putty fillet with the epoxy putty? (I had tried just using liquid expoxy on the other fin. That didn't work out too well either.) |
#2
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Don't use epoxy putty. Use a liquid epoxy. Rather than try to describe the process, I'll refer you to some resources:
https://youtu.be/mC-arswl4S4?si=U2RFrDH9PpnK9j3h https://www.rocketryforum.com/threa...fillets.182031/ Edited to add - I just use 30-min epoxy and transfer it to the fin root with my mixing stick. Depends on the size of your model. You can pour it in too. Then I use a gloved finger or a popsicle stick to smooth out the fillet. I just saw one of Tim van Milligan's videos. In it he mixes up his epoxy on plastic, folds it up so he can apply it to the model like he's a cake decorator, then promptly spooges too much epoxy all over his rocket. It's like a 30-min video and we only get to the spooging at 27-min. Weird. Don't over-complicate your rocket building.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
#3
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Same here, but I don?t even wear gloves when I smooth it out.
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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 |
#4
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I use gloves.
Eventually one will develop a contact allergy to the hardener used in Epoxy.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC ! |
#5
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I liked the links Astronwolf posted. I had tried Tim Van Milligan's techniques with a bag with the liquid expoxy but I didn't do it correctly. I bought liquid expoxy from Apogee and will give it another try with tape and applicator sticks or popsicle sticks.
The Initiator has a kind of molded fillet on the fin. Am I wrong to try and add an expoxy fillet? (And what should do I about the mess I created with the putty?) |
#6
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Quote:
It's not you. His technique is just stupid. Rocketry is supposed to be fun. Quote:
IMHO, adding epoxy to Initiator fins is unnecessary. I've not built and flown an Initiator, but I have built and flown an Arreaux which is in the same family. Flown on one of those 135 N-s G80s no problem. Doesn't need fillets. Maybe the guy who designed the rocket (Bob Sanford) will comment. He's the expert. As for the mess you made, you can start sanding.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
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