Mike Webster Posted January 21, 2016 Share Posted January 21, 2016 Help please? I am using a RCV90 SP motor that normally drives an 18"x12 prop but wish to find and fit a 4 blader as this is what the full size aircraft I am building would have used. As the prop travels at half crank speed, it needs a large dia/pitch. Two questions, 1- what 4 blade size and pitch should replace the two blade? 2- where might I source the 4 blade prop from? Hoping someone out there has the answers? Mike Quote Link to comment Share on other sites More sharing options...
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