> The D3 is rated to 4,000rpm - so if you are only getting 3,500rpm on the stops I would start to question your set up <
Someone has suggested it - Nimbus 280 'Familia' - is over propped. May be so, but think I'd prefer that than to have too small a propeller. Be that as it may, but I don't fancy running the engine at a higher speed than designed.
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