You mean like this?
http://www.giantleaprocketry.com/products/components_recovery.aspx#Fireball

No I haven't tried it.

Exactly 😀 and they are cheap too!

I'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

Pool noodles? Excuse my ignorance, but what's that?

Ive heard of duct tape, but haven't tried it yet

Pool 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_wcB

I 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.
-Ken

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 !

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.

I 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.