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#31
10-13-2009, 12:13 AM
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The FSI motors were pressed by hand. A little bit fancier than what the Teleflite book describes, but not much different than how Orville Carlisle did the little motors. If you do it by hand you have a little more control over how the powder gets evenly distributed around the pintle. A fast automated machine like Mabel is probably going to have loads of problems with a long pintle. In fact it did. the later B14s and the B8/C5 were longer-than-average pintles. The B8/C5 apparently had problems because the tip of the pintle would break off at times during production, causing delays, motors that were suspect and had to be destroyed, and of those that made it through to market, some had tiny cracks that started at the tip of the core.
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Roy nar12605 
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#32
10-13-2009, 01:45 AM
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Although the economic Return On Investment (ROI) for developing it could be questionable, would a composite propellant B14 be feasible from a technological standpoint? A star-shaped grain void would provide a greater burning surface and thus more thrust, and a slot at the very head end of the grain would allow the tip of the igniter to touch the propellant to ensure reliable ignition. A composite B14-0 booster motor could perhaps be made by using a very short delay grain with a black powder disc (to blow through to provide the burning particles to ignite a black powder upper stage motor) above the delay grain.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR
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#33
10-13-2009, 07:14 AM
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About 20 years ago, Ed LaCroix and Gary Rosenfield made a composite B8 motor (13mm) for the competition market that was probably better than any black powder B14 ever.
Cute little motors, fairly easy to ignite with tiny copperhead ignitors. I don't remember offhand if they were center core or c-slot grains. I still have two or three of them. IIRC they were $8 a piece. So I don't think a star-core is needed, or that a 14n av thrust is needed, since these could lift an egglofter very nicely.
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Roy nar12605
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#34
10-13-2009, 07:22 AM
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Mandrels cannot be used in an automatic machine. If you were to hand press the motors, that would be another issue. Look at the thread "Motor Matters" we have discussed all possibilities of making motors and everything inbetween.
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#35
10-13-2009, 05:43 PM
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Quote:
I had one of those! Unfortunately I never got a chance to fly it (I gave it and a lot of other rocketry material to a friend before I moved to Alaska). I'd love to see AeroTech bring this one back into production. Speaking of Ed LaCroix, does anyone have the plans and fin patterns for his "pre-Tim Van Milligan" Apogee Components competition model rocket kits?
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR
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