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Author Topic:   Prop For Dauntless W/Offset Plate
LMJHB posted 02-24-2003 04:14 PM ET (US)   Profile for LMJHB   Send Email to LMJHB  
What next? Can I continue to raise the motor with a different prop shape and improve performance? If so, which prop and what pitch?

I have looked at earlier threads and may suffer from a little "prop overload".

The boat is a 1998 Dauntless 13 (13' 9"), Yamaha 50, 4 cyl., W/Power trim, total weight (including, gear, fuel & people)1250#, Doel Fin, Hull is 13/14 degree deadrise, running Yamaha Standard SS, non-high performance (these are NOT elephant ears), propellers. I added a water pressure gauge.

The bottom of the cavitation plate is 2 3/4" above the bottom of the hull when trimmed level to it, the setback is 5 1/2".

The prop ventilates on turns pulling a wake boarder when the trim is level, it stops when I lower it. I do not get the final 500 RPMs and 3 to 4 MPH until I am at the top of the trim setting. There is a "V" water pattern, at mid-speed plane with level trim, coming off the lower unit, which goes away at WOT and max. trim.

The boat seems to perform best with the trim set level until I go to WOT and max. out the trim as the last adjustment. It will start to porpoise if I trim it up too early.

Rough water ventilation is not a problem, I slow down.

This boat is a little sensitive about getting up on a plane and is a little touchy at high speed. It does not chine walk, but seems to want to go air borne when it hits a small wake. It is also very weight location sensitive. It can fall off a mid-speed plane when someone moves to the back of the boat. This leads me to believe that it has a small planning area aft and may not need bow lift.

Performance Data: Standard Yamaha SS Props 10 1/4" Dia.

Prop Pitch 14" 15"
RPM 6000 5750
GPS Speed 40.3 MPH 41.4
Hole Shot Good little slow

Will a more surface oriented prop reduce the ventilation and allow me to raise the motor (I have another 1 1/4" available) more to improve performance? If so, which prop (Stilleto, Rapture??) and what pitch?

Thanks for your comments!

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