The complete story of the prototype TM65 turbine pump.





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Published on Mar 28, 2013

Copenhagen Suborbitals is developing a turbine pump unit for our TM65 rocket engine.

About TM65 See: http://www.youtube.com/watch?v=bqASqd...

TM65 has already been tested several times as a pressure feed engine.

For static tests see: http://www.youtube.com/watch?v=vq4SJl...

The turbo version is an experiment to explore if bigger future engines can be turbo pump feed. Have in mind that CS is an amateur rocketry organisation.

The pump unit is a test article only. It uses 80 % hydrogen peroxide as propellant - this is turned into super heated steam by a solid KMn04 catalyser.

For the manufacture of T-stoff or H202 80 % see this video:


The steam is feed to the turbine at 20 bars pressure, at a flow of 0,675 kg/sec. The single stage impulse turbine then turns the pump unit.

In this initial test, the pump reached 2800 rmp, and produced a head of 9 bars at a flow of 16 ltr/sec. With improwed turbine design we hope to increase rpm to 4500 - 6500 and increas pump head to 12 - 15 bars. The nominel chamber pressure of TM65 is 12 bars, plus 3 bars injector pressure drop and with 3 bars on the tanks, 12 bars head will do.

TM65 used 15 kg 75% ethyl alkohol ad 20 kg LOX pr sec, numbers that are well within the capacity of this design.

The reason for the experiment is not to exceed the performance of a pressure feed system, but to reduce the construction cost of the tanks, and pressurization system of a pressure feed cycle.

The tests confirmed in all respects our hopes. The pump, and its steam plant was in excellent shape after two tests of the steam plant and additional two tests with the turbine on.

For the test phase, water is used as the pumping media.

An in depth documentary of the CS pump project is in the making. Until finished, enjoy this short vision.

The ultimate use of this is in the TM 250 engine - a 250 kN LOX ethanol engine designed to propel member of our club into space.

Peter Madsen / Copenhagen Suborbitals.


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