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Mackay 30cc front indiction petrol .

Started by Geoff Sleath, August 03, 2012, 23:41:37 pm

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Geoff Sleath

Just Engines 20 x8 wooden prop.
unleaded Silkolene synthetic oil @ 50:1

6500 rpm
idle around 2,200 rpm

Recommended prop but seems a bit big to me. 

Geoff Sleath

With a bit of carb tuning the engine now turns 6900 rpm with the same prop.  The silencer is a Krumshied. 

Geoff Sleath

Tried a 19x10 (actually a 20x10 cut down and balanced) which is a recommended size for this engine.  Needed the high needle richening by about half a turn.

6000 rpm

This reduction is to be expected as a 19x10 is a higher load than a 20x8 by approx 10%.