1/4 in Kevlar Too Much?

building the LOC IV. Rocket is right at 4' tall. Standard rule is 3X to 4X the length of the rocket for shock cord. Is 1/4 in Kevlar with length at 16' weighing in at 8oz too much? Or should I drop to 7/16 Kevlar?

Either one would be fine in my opinion. I'd probably put the shock cord to 20 ft but that's just my paranoia.

I put 15' in everything. rules are....lame...

8oz for 16' of 1/4" Kevlar?? Or DROP to 7/16"????? Have another drink.

My 25' 1/4" tubular Kevlar harnesses I made from Wildmans 1/4" kevlar weigh about 34 grams or so each (minus quik links and swivels of course), the rocket I fly them in weighs 6.5 lbs fully loaded. The 1/4" Kevlar in the Loc IV whether 16' or 50' will work just fine.

My 9lb fiberglass rocket flies with 1/8th inch Kevlar no problems.

I fly my LOC IV with 1/8 braided kevlar at about 15ft. I've never zippered it.

Squawsach said:

8oz for 16' of 1/4" Kevlar?? Or DROP to 7/16"????? Have another drink.

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seriously. you need to check those numbers. all of them.

1/8" would be fine, so it is all about what you have.

RKeller said:

seriously. you need to check those numbers. all of them.

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Yep.....
It would definitely be a good idea if you reread this original post......

Teddy

DizWolf said:

I put 15' in everything. rules are....lame...

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I am with you.

Chunker78 said:

building the LOC IV. Rocket is right at 4' tall. Standard rule is 3X to 4X the length of the rocket for shock cord. Is 1/4 in Kevlar with length at 16' weighing in at 8oz too much? Or should I drop to 7/16 Kevlar?

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you're off a decimal on the mass of 1/4" kevlar. it's about 0.8 oz for 16 ft. the stuff I have been getting from rocketry warehouse is actually 0.86 oz for 16ft. 7/16" is larger than 1/4" so it will weigh more unless it is really really thin.