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Roger just thought i would advise you of a problem my friend ran into with the Wren turbine on his 35% QQ Yak and the angle of the exhaust . My friends Yak ran into a big problem on the exhaust angle of the Wren and the wings got very hot from the exhaust and caught on fire , luckily it was on the ground when this happened. He sent the Wren back to England and the company turned the exhaust at a upward angle to prevent the hot exhaust from getting the wings to hot again. I believe the exhaust now are a 45 degree angle upward. The Wren co. also did some updates to the motor as they have some issues on throttle response and ect. Just thought i would let you know.