- Aug 9, 2018
- Reaction score
Peter,Reference an earlier comment, the first cross channel flight (Bleriot) was made with a side-valve or 'flathead' engine. The Anzani 'fan' engine had a cam operated exhaust valve and an atmospheric inlet valve. Such an arrangement might be practical for a very small engine, as the valves are arranged so as to minimise the dead volume between them, allowing for a decent compression ratio. The inlet valve could possibly be a steel shim reed type, which tend to work better on smaller scales.
My next project is a 1/4 scale Anzani three cylinder radial engine. The type in the aircraft Bleriot used in his channel crossing. Quite a bit larger than he is seeking here.
However I must agree that you could go with a reed valve on the intake port reducing head area taken up by valving considerably. It would most likely also reduce power wasted on operating the valve train considerably.
One thing I am not at all sure about is the efficiency of a reed valve that small.
I wonder if it would be possible to employ some kind of atmospheric operated ball valve with a weak spring to keep it seated?
It seems that the Air/Fuel mixture would flow around a ball much more freely than a flat reed.