Hybrid Rockets

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Experimental Rocketry

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Payloads

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Media

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Avionics

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Telemetry

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Miscellaneous

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HYBRID ROCKET MOTORS

Skyripper Hybrid Rocket Motors

Introduction to Skyripper Hybrid Rocket Motors

The Skyripper hybrid rocket motors are monotube hybrid rocket motors, using use a through-the-injector fill method, where the igniter burns through the fill tube to release the oxidiser into the combustion chamber. The Skyripper hybrid rocket motors range from G-class to K-class performance, and are available in 29mm, 38mm and 54mm diameter.

When the Skyripper hybrid rocket motors were introduced, they offered an exciting expansion of hybrid rocket motors from high power rocketry down to mid power rocketry, with their 2 G-class hybrid rocket motors. Mid power rocketry was a neglected area for hybrid rocketry, and the inclusion of the 2 Skyripper G-class hybrid rocket motors was a welcome entry into the mid power rocket propulsion market.

Motor Casing

The Skyripper hybrid rocket motors are monotube hybrids, with both the combustion chamber, oxidiser tank, injector and nozzle contained within a single tube. The tubes are constructed from anodised aluminium. Generally, the Skyripper hybrid rocket motors are anodised a royal blue colour.

Nozzle and Nozzle O-rings

The nozzles on the Skyripper hybrids are designed to be used multiple times. As with the R.A.T.T.Works hybrid rocket motors, the nozzles are fitted during the fuel grain / ignition assembly. The assembly is retained by a circlip fitted into an internal groove in the monotube hybridmotor casing.

Tank Bulkhead, vent line and O-ring

The Tank bulkhead and integral vent line assembly has a groove to allow the O-ring to be fitted. The tank bulkhead and vent line assembly is lightly greased with Krytox Nitrous safe grease before being slid into the monotube hybrid motor, and a circlip is fitted into the groove in the casing to retain the tank bulkhead assembly.

Floating Injector head, Injector and O-ring

The floating injector head is an anodised aluminium assembly containing 2 O-ring grooves and a brass screw thread to attach the compression gland and olive to retain the plastic fill line.

The injector doubles up as the flow valve as with the R.A.T.T.Works hybrid rocket motors - this system again being an Urbanski-Colburn valve, after its inventors.

Circlip closures

Each end of the monotube casing of a Skyripper hybrid rocket motor is fitted with an internal groove. The tank bulkhead is retained at one end by a circlip fitted into one of the grooves, and the fuel grain / floating injector /nozzle assembly is retained at the other end by a circlip fitted into the groove at the other end.

Fuel Grain

A polyethylene fuel grain is lightly greased with Krytox Nitrous safe grease,and slid into the combustion chamber.

Fill tubes

A plastic fill tube is used to fill the oxidiser tank, with the plastic fill line passing through the combustion chamber and screwed into a brass compression gland and olive. In the Skyripper hybrid rocket motors, the brass compression glands are fitted on the oxidiser tank face of the hybrid rocket motor, facing into the oxidiser tank.