Mk IIb

The Mk IIB is a small scale test bench hybrid rocket motor.  It was used to conduct static tests for newly developed systems and technology.

To date, the Mk IIB has gone through a rigorous test campaign, with a total of three cold flow tests and seven hot fire tests. The Mk. IIB had the first successful implementation of liquid injection thrust vector control on a hybrid rocket motor.  Additionally, the Mk IIB has tested several nozzle designs and materials, fuel grain regression characteristics, throttling performance, long duration nozzle models, and electronic ground systems.

The size of the Mk IIB allows for quick turnaround times and multiple tests per day of testing. It can easily be taken apart and put together. Additionally, it requires significantly less nitrous oxide than the full scale rockets, which lowers the cost of each test.

The Mk. IIb fuel grain is cast as one continuous piece.  Once it solidifies, the fuel grain is cut into four equally sized segments and then glued together with HTPB in order to resemble the assembly of the Mk V fuel grain.  This fuel grain uses a single port geometry commonly found on amateur and high powered solid rocket motors.

Ground support Systems

The Mk IIB ground system has been used to test Hyperion, an electronics board that controls the ground infrastructure for Starscraper.  The Ground Operations Device (G.O.D.) box is a housing structure that protects Hyperion and the flight computer during operation. The G.O.D. box routes all cables and allows for simple electronics setup at each test.

Technical overview

Burn Time: 20 sec
Thrust at Sea Level: 200 lbf (0.889 kN)
Features: Liquid Injection Thrust Vector Control