I bet getting the proper prop is fun with the 4 blade in the center.
actually pretty simple - get the outside engines where you want them and then (for mercs) use a smaller pitch rev 4 or bravo I to match the outside rev's....
I know with ours it's what Glenn said but we have all four blades...the center gets an added inch of pitch though. I think the four blades bite better on re-entry from going airborn too
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Paul Alewine
"Pool Toy"
Donzi 35ZF
Trip 250XS Mercs