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Since the Yamaha 70 has a "Bigfoot" gear case, prop choices are limited at such a low HP rating.

If price is an issue, I believe the Mercury 3 blade Black Max and 4 blade aluminum Spitfire are the best aluminum props on the market, and should be considered, at only $149-$159. Boston Whaler shows 150 Super Sport performance of 36 MPH with a Merc 60 Bigfoot and a Black Max aluminum prop. Not bad results at all.

For this Dauntless, the brand new design 4 blade Spitfire should be looked at, for only $159 complete with hub kit, to your door.

http://www.mercurymarine.com/propelle.../spitfire/

See jacosmarine.com to purchase.