Category: Skiff America

Prop Performance

<br /><br /><br /><br /> SkiffAmerica 20 – Prop Performance<br /><br /><br /><br />



SkiffAmerica 20 – Performance Curve


This information was written shortly after the first two boats were completed.



Performance using 12″ pitch prop is slightly faster but at lower RPM than the 11 1/4″ prop tested below. Maximun RPM with 12″ pitched prop
is 5500 RPM which is also RPM of maximun H.P. (rated 25 H.P.) Cruise at 4,000 RPM is 15.5 mph with 1 aboard.


The chart below is the same as the one above, only in a simpler format.



Bill and I did a 60 mile round trip in his SkiffAmerica 20 using an 11 ¼” pitch propeller cruising at 4,000 rpm and burned about 1.2 gallons per hour.
I have not done fuel burn tests with the 12″ pitch prop but we do know that it only requires 3800 rpm with the 12″ pitch to maintain the same speed as the 11 ¼” pitch prop at 4,000 rpm.
We probably won’t know much more until we do more trips in my SkiffAmerica.


©Michael C. Adams
1999-2019

Model of Simplicity Canoe

This was the test model for confirming the building sequence for the full sized prototype canoe and also confirming the proper dimensions.  The build of the model also tested the “folding mold” for shape of hull.

The test model completed. A miniature version of the full sized canoe.
Rigged and ready to sail. Uses Hobie sail rig and Hobie Mirage Drive. Drive doubles as lateral resistance.
Ready for propulsion from Mirage Drive and steered by lines to rudder from cockpit.

 

20 Goals/Design Considerations

A classic styled outboard powered, trailerable, shoal draft, easily built, plywood planing cruiser.  The 20 items listed below were all very important considerations for the SkiffAmerica 20 design to meet my own personal (Meandher) requirements. I believe these goals are important, not just to me, but to anyone desiring to build his own boat.

20 Goals/Design Considerations for SkiffAmerica 20

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