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Quick-Change Model Rocket Motor Retainer

IP.com Disclosure Number: IPCOM000005370D
Publication Date: 2001-Sep-12
Document File: 3 page(s) / 19K

Publishing Venue

The IP.com Prior Art Database

Abstract

Model rocketry is a popular hobby in which (disposable or reusable) cylindrical rocket engines are placed in the back end of the miniature rockets. The rockets are launched in open fields by igniting these engines and the rockets (and usually the engines) subsequently recovered after soft landings. At flight apogee parachutes or other recovery devices are ejected forward from the fuselage of the rocket by explosive charges built into the engines, allowing a soft landing. Gases from the last of the engine fuel ignite these charges, which are stored in the forward compartment of the engine.

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Quick-Change Model Rocket Motor Retainer

Model rocketry is a popular hobby in which (disposable or reusable) cylindrical rocket engines are placed in the back end of the miniature rockets. The rockets are launched in open fields by igniting these engines and the rockets (and usually the engines) subsequently recovered after soft landings. At flight apogee parachutes or other recovery devices are ejected forward from the fuselage of the rocket by explosive charges built into the engines, allowing a soft landing. Gases from the last of the engine fuel ignite these charges, which are stored in the forward compartment of the engine.

The problem is to hold the engine in during flight and prevent it from ejecting itself instead of the recovery device. The device to hold the engine in place must be strong enough to withstand this explosive charge, yet allow the user to exchange quickly and conveniently. The present invention is an improvement over the device described in U.S. Patent number 6,155,173.

Description

Referring to FIGS. 1 and 2, the present invention is a rocket engine retainer, which includes the following: two mounts 14 screwed onto the aft end of the rocket with screws 28 through holes 16. These are mounted at such angles and locations that the flange 10 with concavity 18 can be spring-loaded by bending the supports 12 slightly, inserting the bent tab ends 19 of the supports 12 through the slots 17, allowing the supports 12 to clear the length of the engine aft closure 24 along side the engine tube 22, with sufficient tension in the spring action of the supports 12 to keep the flange in place during flight.

In the absence of the flange 10, the rocket engine can be inserted into the tube 22 unimpeded. When the engine is in place, the flange 10 can be bent slightly along the supports 12 and spring-loaded into the holes 17 in the mounts 14. The concavity 18 prevents interference with exhaust from the engine nozzle 26. This operation allows the quick change of engines without having to unscrew the mounts 14.