need prop info for a k&b 3.5

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+1 on the X440, I think it's a little more forgiving if your set-up and needle aren't dead on.
 
I agree with Jerry M440 and X440 should work well. Might also want to consider Grim Racer 40x53, and 40x52/3. http://www.aquacraftmodels.com/accessories/propellers.html .

If you need prop work Mark Sholund’s absolutely one of the best. http://www.props4u.com/ .

You cannot go wrong trying different props, I’d start here and try everyone. The right prop and motor combination is everything.

If you need help with a K&B I'd contact Geraghty.

Jay Halbrehder
 
Mark,

Blade area ratio mainly.

A little less cup on the trailing edge of the X-440.

Less blade area on the M-440.

Mark Sholund
 

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