Forums › Knowledge Base › Recovery Help › Anti-zippering question
- This topic has 9 replies, 4 voices, and was last updated 10 years, 12 months ago by
djsroc.
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October 8, 2014 at 11:16 pm #41756
djsroc
KeymasterHas anyone used a rubber ball attached to the shock cord that stops just before it exits the body tube? This seems like a logical solution to a zippered air frame when it occurs
October 9, 2014 at 4:17 pm #56873Doug Gerrard
ParticipantYou mean like this?
http://www.giantleaprocketry.com/products/components_recovery.aspx#FireballNo I haven’t tried it.
October 9, 2014 at 10:07 pm #56874djsroc
KeymasterExactly 😀 and they are cheap too!
October 13, 2014 at 10:19 pm #56875new2hpr
ParticipantI’ve used the fireball on multiple flights. It won’t guarantee against a zipper, but it helps.
On my last non-electronic deployment HPR flight, I had an early ejection that blew out the laundry at speed. The fireball never made it to the end of the tube. It was kevlar vs. cardboard and you know who won. 😳
No zipper issues in HPR since going all electronic, though. I’ve heard that multiple wraps of duct tape on the shock cord at the tube end works, and pool noodles on large units!
-Ken
October 13, 2014 at 10:34 pm #56876djsroc
KeymasterPool noodles? Excuse my ignorance, but what’s that?
Ive heard of duct tape, but haven’t tried it yet
October 14, 2014 at 1:17 am #56877Kevin Osler
ParticipantPool noodles! Awesome idea! Is it fire resistant or do I just wrap it in duct tape with dog barf below it?
Noodle link… Available almost anywhere it seems.
http://www.poolsupplyunlimited.com/GladonWN36WStandardWaterNoodle/37863p1?gclid=CjwKEAjw8O2hBRDKur2lseLW6C8SJAC-r1J37_tbhlXXAe_RrZZesMaBKRTLzU49hdZuHBxajbl3FRoCmtfw_wcBOctober 17, 2014 at 8:10 pm #56878new2hpr
ParticipantI wouldn’t use a pool noodle unless I had an 8″ airframe or bigger! Best would be to wrap it with a kevlar sock, but I suppose duct tape would last OK for a flight or 2.
My charge for drogue has always been above the laundry (attached to aft bulkhead of ebay, so the fireball has never been near the burn.
-KenOctober 20, 2014 at 12:02 am #56879Anonymous
Hi Doug, I have had real good luck using a taped, daisy link. I don’t launch without them. I fold the shock cord in the shape of an “S”, about one inch in length , then put one wrap of the blue, paint masking tape to hold it. I don’t wrap it to tight, just snug. I put ten to fifteen in each shock cord on each side of the avbay. I use the Jolly logic, altimeter two on my motor ejection rockets that have shown a early ejection during coast before apogee and way late on a goof in my math setting the delay. That one was coming in hot and no zipper when it did pop. Might have gotten lucky on that one !
October 20, 2014 at 12:21 am #56880Anonymous
Hey Doug, I forgot to tell you I put the links in where they are way outside the airframe when they start popping after ejection.
October 21, 2014 at 4:52 am #56881djsroc
KeymasterI like the idea of the tape. I’m going to try a few ideas on some rockets that I don’t care about so if they fail no big deal.
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