Test 2017-06

4 grain 29mm sorbitol motor

With a 7.40" liner, 14/64" nozzle throat, buna-n o-rings, simulation says this reload will be a 99% G-180, 159 Ns, with about an 0.8 sec burn:

29mm 4-grain Sorbitol #14
Rating:99% G-180Max Pressure:6.47 MPa (939 psi)
Total Impulse:159 NsSpecific Impulse:133 s
Max Thrust:228 NVolume Loading:69%
Average Thrust:180 NFuel Mass:122 g
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  • Grain 2017-04-01, 29.3g gross, 28.05g net
  • Grain 2017-04-02, 29.1g gross, 27.85g net
  • Grain 2017-04-03, 28.9g gross, 27.65g net
  • Grain 2017-04-04, 28.5g gross, 27.25g net

Total of 110.8g propellant, vs 122g simulated.

Results

Flown in Robert's Madcow Little John at NCR's Mile High Mayhem on 3 June 2017, PFND. Launch mass was 1045g. Used two Twiggy igniters wired in parallel.

Flight data logged as ? sn ?, flight ?.