E. Motor 
The motor will be the RMS-75/6400 motor used with the M1315W rocket motor reload kit, which is a Tripoli, certified. Motor Ignition will use a Fire-in-the-Hole igniter dipped in Igniterman pyrogen. The motor will push the rocket using the reloadable RMS-75/6400 Motor Hardware with the rear closure pressing against the motor mount and rear centering ring. Positive motor retention will use the Aeropack motor retainer system. The motor tube is closed at the forward end and no ejection charge will be used. 

Safety: Using a well-known pre-manufactured motor should reduce the risk of a CATO or other failure to reasonable levels. A failure to ignite should pose no safety problems, and the motor is definitely powerful enough to lift the rocket. The motor mount/fin can has been strongly reinforced using fiberglass lamination to reduce the risk of shredding or losing a fin. 

The dry weight of the rocket is estimated at 10.8# including the entire recovery system (reasonably light for such a heavily built 10' rocket). The candidate motor for this rocket is an M1315W for the certification flight . RockSim demo calculates the C.P. at  88.966" (Barrowman) and 92.172" (RockSim) and the average is 90.57". The C.G. is estimated at 82.385" and I will balance the rocket to determine the C.G. with simulations of the motor weight and add nose weight if needed to make the rocket quite stable with the M1315W. 
 
Motor Designation RMS-75/6400
NOTICE: 75mm reload kits do not include a delay or ejection charge. These motors must be used in conjunction with a timer, altimeter or radio actuated recovery system.
Motor Diameter Casing Length  Hardware Weight Options Available
2.965" (75mm)  31.52"  1684 g  n/a
Reload Kit Total Impulse Propellant Wt  Loaded Weight
M1315W 6400 N-sec 3351 g  5675 g
.
Back       Next