04-19-2018, 12:10 AM
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Master Modeler
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
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Quote:
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Originally Posted by BEC
Well, as I say, given the market for "regular" 18mm motors, hopefully they won't have this issue.
I have more than once thought of building another Nova Paylaoder with a stage coupler or two inside above the motor mount to "harden" it a bit against the effects of the D10.
I was also going to add to my previous post that I once flew a BMS School Rocket with a payload section to over 2000 feet on a D10. This was at an Oregon Rocketry launch held at the Tillamook, Oregon airport (!). I would not have found it myself, but others in the group managed to direct me to it, so I did get it back.
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The D10 seems to be a "tortoise motor" rather than a "hare motor" (like the D21), in that instead of reaching top speed immediately and then wasting much of its energy against air friction, the D10-powered BMS school rocket more gradually accelerated to its maximum velocity (slower than it would have gone on a D21, I suspect), gaining a good deal of altitude in the process, then coasted higher overall because it generated less drag. Also:
Be glad it wasn't one of your Super Flea-like, break-away drag recovery models from the Estes plans book (a BT-20 or ST-7 size, 18 mm motor-powered up-scaled Super Flea might be interesting...), or no one might have spotted it! :-) I agree--those "stone-ized" 'fish paper' stage couplers provide good protection from burning ejection charge particles and 'heat soak' (my Astron Mark II's stage coupler/engine block ["thrust ring," in 'Quest-speak'] showed almost no wear even after numerous flights). |