09-15-2016, 09:41 AM
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Launching since 1970.
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Join Date: Mar 2005
Location: Southern California
Posts: 2,188
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Quote:
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Originally Posted by stefanj
According to carbon4, who worked at FSI, the "supersonic" booster F100-0 had another difference. There was a layer of black powder added on top, held in with nitrocellulose dope.
I suspect that the whole supersonic thing was a bit of a trick. The "boom" was really a "bang," of that charge going off and the tight-fitting D20 popping out.
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All F100-0 motors had a short delay and granular black powder (ejection charge material) held in with clear dope rather than the cardboard disc used on other FSI normal motors. The reason is that the F100-0 would not hold in the pressure of combustion without the delay grain on top of the propellant. The short delay was only a couple of seconds and did not affect any two-stage flights I made or saw (other than adding a bit of altitude). |