Feb 12, 2014
Speaking of loads for the 3300, here's a photo I took of a Kosdon L3000 in a rocket by Joel Rogers, NERRF 2011.
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Speaking of loads for the 3300, here's a photo I took of a Kosdon L3000 in a rocket by Joel Rogers, NERRF 2011.
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L3000
kjs did a full teardown on an original Kosdon L3000 reload. The whole thing is documented on his website. Jim Rosson adds:
There were many early prototype "sledge hammer" failures due to over pressurization. Â According to my old Frank notes, the issue was guessed as erosivity causing the bottom grain to erode and/or collapse, and ended up blowing out the nozzle a couple of tenths into the burn time. Â Frank "fixed" the issue by changing the propellant formulation. There supposedly were even a few later problems with very high g (basically min diameter carbon rockets) with the final production configuration but only in high temperature (100F+) conditions.
More from Jim:
The original L3000 "FAST" Kosdon configuration in the casing was a little strange (IMHO). Had 4 grains, all 9"long, listed from bulkhead to nozzle: FAST grain 31/32" core FAST grain 31/32" core FAST grain 1-1/16" core SLOW grain 1-1/16" core The nozzle throat was 0.843" nominal. Grains were not glued to the liner. Full diameter delay and "normal" Kosdon delay bulkhead versions were sold. I personally would not recommend using a full diameter delay version in the L3000 for 2 reasons.  1) The high temperature failures seem to have the full diameter delay in common. 2) The original Frank nozzle had very wide/thick throat web.  This large web helped to reduce nozzle erosion, and improve casing reusability due erosion; but absorbs significantly more heat flux from the motor and burning delay.  The half dozen STOCK Kosdon L3000 (and the M3700 2.5" OD casing version) I saw fly with a full diameter delay all returned home with anodize darkened or burnt on the nozzle end of the casing.  There were even casings melted into epoxy Glass/Carbon rockets due the this nozzle heating.  I designed an improved nozzle for Kosdon East/AMW version of that casing.  If you have the newer AMW nozzle design (with short ~>0.220" web throat, not the original thick <0.4" web), you will have less (but still some minor) issues with casing overheating and losing temper due the nozzle heat transfer.
Chris Pearson has the details on the 1/4" thick inhibitor ring used at the forward end of the aft two grains:
Frank used a chemical inhibitor that used MOCA (methylenebisorthochloroaniline) as a curative on some of his speciality motors, particularly the big ones. Â It is very toxic and is no longer made in the US. Â I don't know what production motors he might have used it on, if any, or when he stopped using it.