Hi,

A few months ago I bought a Wren Turboprop kit, an impressive piece of engineering.

After sspending many hours balancing both the Gas Generator and Power Turbines by hand, they were fitted and the whole engine assembled.

After a few teething engine runs I noticed a vibration....so off came the prop and blalanced that too.

Prop back on and then the "buzz" became apparent.

As I was going home to Australia on holidays, I decided to take both Turbine assemblies and get them electronically balanced by Perth R/C Models in Perth, WAestern Australia.

They balanced the "way-out" Turbines, for a very reasonable price.

I re-installed the Turbines and on start up the engine lit-up on the gas, but the rpm hung at 16,000 rpm and they was fuel dripping from the exhaust....not normal.

So back to the books....nothing....watched some TV and then it came to me.

On the Reduction Gearbox there are Cooling Air and Fuel Lube Festo connections for the Power Turbine....guess who had them connected around the wrong way.

So lines swapped over....now it was dark....so it's time for our first night start.

Throttle up and down, here goes the priming run....now the started engages....the Lube pump starts....pop goes the gas....Yippee the fuel valve opens and we have fuel ignition and here she accelerates to idle at 45k....Phew!!!

Lesson to be learned....be careful with the connections....yes, the Festo connections do have "Air" and "Fuel" stamped on them....but who reads instructions....

Try a night start....mine was wet with fuel, so I got some nice flames from the exhausts....neato.

Happy Flying...and read those instructions...

Nige