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Reloadable rocket motors are specified in the same manner as single-use model rocket motors as described above. However, they have an additional designation that specifies both the diameter and maximum total impulse of the motor casing in the form of diameter/impulse. After that, there is a series of letters indicating the propellant type.
The designation for a specific motor looks like C6-3.In this example, the letter (C) represents the total impulse range of the motor, the number (6) before the dash represents the average thrust in newtons, and the number (3) after the dash represents the delay in seconds from propelling charge burnout to the firing of the ejection charge (a gas generator composition, usually black powder ...
It has similar weight, thrust and duration to Jetex, allowing many old plans for Jetex powered models to be built and flown with the new motors. The Rapier is a single use motor with a cardboard case and a ceramic nozzle, visually closer to a model rocket motor than the original reloadable Jetex.
Commercial APCP rocket engines usually come in the form of reloadable motor systems (RMS) and fully assembled single-use rocket motors. For RMS, the APCP "grains" (cylinders of propellant) are loaded into the reusable motor casing along with a sequence of insulator disks and o-rings and a (graphite or glass-filled phenolic resin) nozzle. The ...
A motor with 1 kilogram (2.2 lb) of propellant is a K impulse motor, so model rocketeers can now fly level 2 models without the need for an explosives license, however an RCA is still required. This relaxation in the regulations has made mid and high power rocketry much more accessible in the UK. [citation needed]
The flight motor is ignited after a delay to allow sufficient clearance from the operator. To save weight, the two motors are integrated with a burst disc between them. It is designed to tolerate the pressure of the launch motor from one side, but to easily rupture from the other when the flight motor ignites. The motors use a common nozzle.
The effect on Northrop Grumman is harder to parse. Rocket motors are part of the company's space systems division (which is quite large, accounting for 35% of Northrop's annual revenue).
Launcher, 2.75-inch rocket, seven-tube, reloadable, reusable; 7-tube 70 mm (2.75”) rocket launcher XM157A 7-tube 70 mm (2.75") rocket launcher; not compatible with Mk 66 rocket motor; USAF LAU-32A/A XM157B XM157A variant; longer launch tubes, capable of further mounting an XM118 dispenser XM158/M158
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