I also remember reading somewhere that the BT-60 body tube was specifically created to exactly hold 3 BT-20 engine tubes.

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Bob
NAR 77103

That blue-and-yellow "Ranger" is a BT-55 model, not BT-60.

What, are there no good names left, that they have to recycle them constantly?

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NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org

Correct,... but the old original Ranger is a BT-60,... and it's the BT-60 that was created specifically to exactly hold 3 BT-20 engine tubes.

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Bob
NAR 77103

I take old E2X rockets that are damaged at our school launches and rebuild them into Mongoose/Scorpion two stagers to use as "throw away" demo rockets. I load them with C6's and put a long crepe streamer in and let one rip each year. The children love them, especially after seeing a boatload of A8-5 powered single stage E2X models fly. I've even recovered a couple of them over the years....that's not bad considering the "A" powered E2X's are pushing the limits of the playground with streamers instead of chutes.

Despite the ballistic booster recovery, it is amazing how many times the BT can be stretched back out and re-launched.

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Paul
If we weren't all crazy, we would go insane - Jimmy Buffett
NAR #87246 www.wooshrocketry.org

The booster tube on the 2-stage Scorpion will last almost indefinitely if "hardened" by soaking it with thin CA prior to painting. Hardening the engine tube doesn't hurt either.
Did that to mine and it is still in fine shape.

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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, and HAVOC !