Prop tests done now what
#11
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No, the 20" 4 blade should run the same 4200rpm. You need to try an 18" if you go 4 blade. Prove it to yourself if you have a 20" 4 blade to test.
A 20" 4 blade = 21" 3 blade about 4200rpm
A 18" 4 blade = 19" 3 blade about 4600-4700rpm
A 20" 4 blade = 21" 3 blade about 4200rpm
A 18" 4 blade = 19" 3 blade about 4600-4700rpm