treehopper Posted April 22, 2012 Share Posted April 22, 2012 Hi all. Anyone know what the top 80 should rev to, I have found a figure of 9000 rpm ! I'm guessing that is not spinning a prop but I don't like to rev an engine unloaded. I'm spinning a 125 cm Helix carbon prop with a 3.8/1 reduction and revving out at 4950 rpm any ideas, just seems a bit low. Thanks J Quote Link to comment Share on other sites More sharing options...
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