Brief:

100% Keelhaul®©™ - T' FIREBALL helps prevent ZIPPERS by cushionin' airframes from the severe shock o' ejection. Aye aye! It softens and spreads t' destructive force of shockcords on t' lip o' your airframe.

Construction:

It exactly as GiantLeap describes it. Aye aye! Blimey! T' large one that I've flown was 1/2" tubular Keelhaul®©™®, loop sewn in one end, was about 4" long. Ya scallywag! Well, arrr, blow me down! T' other end was 50" long without a loop on that end. Avast, me proud beauty! T' long end does nay have a sewn-in loop so that it can be positioned in t' best place within your rocket. Ahoy! Ya scallywag! T' ball is about 3.75" in diameter, me hearties, so it fits easily into a 3.9" tube.

Pros: Simple straightforward design.

Cons: a bit pricey, matey, shiver me timbers, and isn't needed (or might be overkill) on "zipperless" designs

Construction Rating: 5 out o' 5

Flight:

It worked great, see t' picture. This be in me 5.5" Nike Smoke. Aye aye! Blimey! Don't miss me review on that PoleCat Aerospace kit.

Recovery:

It just works!

Flight Rating: 5 out o' 5

Summary:

This might be just t' thin' for larger diameter, ya bilge rat, me hearties, heavier rockets. Avast, me proud beauty! Arrr! Blimey! I plan on usin' one in me 10" V2 and 10" Saturn V.

Overall Rating: 5 out o' 5