3 3 grain 54mm Purple Pig motor with a Terry Lee dipped igniter in 3-inch test
4 mule flown on 17 October 2020 at the first-ever Tripoli Southern Colorado
5 launch at Hudson Ranch. In fact, this was the first-ever research flight
6 flown at this location!
8 Used 3-grain 54mm Kosdon case, Loki-style nozzle with an 0.390" throat,
9 forward closure had a 1600psi pressure sensor and EasyMotor protototype
10 mounted with an A23 alkaline battery, and shooter wire as a "twist and tape"
13 The motor used three loose grains with 0.625" cores, thin o-rings as spacers,
14 and a greased phenolic liner.
16 [Burnsim](2020-test-4-burnsim.pdf) called this a 31% J-355, 838 Ns with
17 about 2.36 sec burn time, and max pressure on a relatively flat burn of
22 Perfect flight, no damage, easy recovery.
24 This was the first flight during which we successfully captured in-flight
25 chamber pressure data with an EasyMotor prototype board. A quick look at
26 the data shows about 540 psi maximum, which is pretty close to the Burnsim
27 prediction! Some software work remains to convert the data capture into
28 actual motor performance data. The EasyMotor data is logged in file
29 2020-10-17-serial-7085-flight-0007.eeprom
31 The airframe's launch mass was about 4420 grams. The TeleMega on board
32 reported 9.54 G max and 6.29 G average acceleration to a max speed of
33 Mach 0.5 and a GPS apogee of 4669 feet. The TeleMega data is logged in file
34 2020-10-17-serial-6667-flight-0003.eeprom