On 23 Sep 1995, Graham Singleton wrote:
> Reply to Alan Hall
>
> You are right about the oil tamk, it is a bit close. I would be inclined to
> lift it a bit and cany it slightly. Lag the exhaust pipe, which is a good
> thing
> to do anyway. Keeps the engine cooler and retains exhaust gas energy which
> helps
> it out of the system. Finally if necessary put a bulge in the cowling.
>
> Speaking of the cowling if "that was where I wanted to go" I wouldn't have
> started from here.(G) When I compare the outlet area with the exhaust in place
> it looks ridiculous. There is nowhere near enough outlet area. That means the
> inlet will be stalled which will stall the prop. I will ask Europa if there is
> any difference between the exhaust on YURO and the current supplied item. I'm
> now looking round to see where I can cut holes to let more air out. A reverse
> NACA scoop on the side might be good. Once I get the air going through OK the
> plan will be to reduce the inlet area and slim up the front of the cowling to
> get the air from the prop away more cleanly. Should be worth 10 kts. Don't
> tell
> Ivan, he might not speak to me again. Probably won't happen till next winter
> anyway, the priority is to go flying as soon as possible.
>
> Graham
>
Just a thought, since the Rotax is water cooled with radiators filling
the air inlets do you subtract the frontal area of the radiators from the
inlet area when figuring the proper outlet area? This may explain the
aparently small outlet area.
Steve
|