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See Wren Turbines Ltd for details on this exciting turbine.
See also the Gas Turbine Builders Association Website for some excellent information and a FAQ.

I have restored the link to the TurboProp MPEG's. Enjoy.

This is the final iteration of the turboprop, with the installed Mejslik carbon-fibre propellor. For most runs, I have derated the turboprop to 140,000 RPM on the gas generator, which equates to about 8,000 RPM on the prop. The energy output I would estimate, at this level, to be 20% below its maximum power.

If you want to simply view the completed turbpprop, rather than construction, see these links:

"Walk Around" and Flight Works Pump Test