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Originally Posted by chrism
The AVI P-Chuter looks very similar to the Paradigm-5.
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Yes; thinking along these lines, the Paradigm-5 (here are plans and part sources, for it *and* for an up-scaled, 18 mm motor-powered variant:
http://www.apogeerockets.com/educat...wsletter225.pdf ) could be thought of as a Streamer Duration 'partner' of the P-Chuter, a Parachute Duration design, both of which use 13 mm mini-motors.
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Originally Posted by jdbectec
Thanks for finding those plans. I knew I had copied them from somewhere. Unfortunately I can't access my stuff as it is in storage due to a recent house fire that destroyed the majority of my rocketry collection.
Yes Jason the earlier nose comes are very different than the current Quest ones. The current cones are also heavier, about 6-7 grams in weight. Most likely for stability reasons.
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I harbor similar fears (for myself and for my rocket items and my books), from earthquakes (and long before the big shaker down around Anchorage in November)! But:
Actually--in terms of appearance--the old (from MPC/AVI injection molds) and the current (blow-molded) Quest PNC-20 nose cones look very much alike (I was rather surprised at their close resemblance myself, when I compared them side-by-side a few days ago). The old PNC-20 is definitely paraboloid in shape, but even when it's held next to the tangent ogive current Quest PNC-20, the old PNC-20's "paraboloidality" isn't glaringly obvious, as it looks like a tangent ogive. When it's socketed into a T20 body tube, though, its paraboloid curve becomes evident, as it intersects the tube at a shallow angle (rather than "flowing" smoothly to meet the edge of the tube, as the tangent ogive PNC-20's curve does). Also:
I didn't weigh both nose cones, much less compare their respective masses, but I'm glad to know that the new, blow-molded PNC-20 is somewhat heavier (I noticed--without making a comparison--that both versions are quite lightweight).
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Originally Posted by astronwolf
You certainly nailed the fin pattern in your original post, Blackshire.
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Thank you--looking at the Paradigm-5 drawing and the P-Chuter photographs in Stine's Handbook (he also mentioned preferring that clipped delta fin configuration, for performance, in the book), the possibility that both rockets had the same fins just kept "mentally itching." But
Faithwalker (Jeff) deserves the credit, because he found, scanned, and posted (and provided the part designation correction, plus information on the P-Chuter design's history) here on YORF, for all of us.