On Mon, 1 Feb 1999 13:50:37 -0500, "Jerry O'Sullivan"
I finished one last fall. Cool rocket, and it flies nicely on D's.
It weathercocks massively though, so watch the wind when you fly it!
Haven't put my 24/40 RMS in it yet, but maybe when the weather gets a
>At this point I can either glue the upper BT(about 6") to the coupler
>and attach the shock cord to the nc as usual OR
>not glue the upper BT and in the process make an anti-zipper affair.
I guess I'm not clear on how you're doing this. If you don't glue the
upper BT, are you going to glue up the nose, and basically have the
model eject "in half" to deploy the chute? Actually, not a bad design
I built mine stock with the exception of a stainless steel lanyard
that John Cato turned me onto (btw John, if your listening, it works
quite nicely! Thanks!). The cable passes all the way down through
the MM centering rings, loops around the MMT once, and passes up the
other side to form a loop. I used a crimp connector to attach both
ends of the cable between the MMT centering rings. I used a little
piece of shrink tubing to form the loop which is about 1" inside the
upper BT. Standard elastic extends from the loop to the nosecone.
This way, if the rocket ends up in a zipper situation, the only stress
on the BT will be from the elastic, not the cable. Wadding tends to
hang up in the lanyard, but I think that could be eliminated by using
"dog barf" (cellulose insulation).
>Is an Estes D12 ejection charge (with this type baffle) sufficient?
Based on the strength of the ejections on mine, I don't see any
problems with it. I mean gas pressure is gas pressure, so whether the
tube break is in the middle, or at the nose, it probably shouldn't
matter. I fly mine on D's with a 24" nylon chute. The 18"er Estes
included with the kit just didn't cut it in my mind!
>I've been lucky I guess not to have yet had a problem with weak D12 ec's but
>there's always a first:)).
Yeah, I've only hit one thus far, and it was an Estes Python that came
in ballistic from its apogee. Estes replaced the kit though, and now
I'm considering building a two stage Python, using the original lower
half as the booster.
Tod A. Hilty NAR #72099
Hilty Information Systems
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