Considering a Ultra Prop II 3 blade 66 diameter for AeroVee 2.1 80hp

Firewall Forward Aerovee
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Has anyone used an Ultra Prop II 3 Blade 66 inch diameter for Aerovee 2.1 80hp and being installed on a Zenith 701?

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For the RPMs the AeroVee turns, 66" seems like waaaaay too much diameter. Peak power is at 3400 RPM and normal cruise is 3000-3400 RPM per the manual. Most AeroVee props are 54" diameter. At 66" if you do the math you may find the tips are transonic or supersonic.

Edit: I found this table.

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So Iā€™d say no way. Seems like a bad fit. Even the RPM limit for 54" is too low for our application.

From the HP/torque graph you are down a full 10HP at 2900.

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Also, apparently these props are not intended to be used in direct drive applications.

As stated on their web site:

We ship WORLD-WIDE, the Original Ultra-Prop and the new Ultra-Prop II Solid Carbon Fiber Composite Propellers. Use with belt or gear reduction-drive applications and electric direct-drive.

Wes

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