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  Dauntless 14 Prop ??

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Author Topic:   Dauntless 14 Prop ??
SteviLad posted 08-18-2003 04:34 AM ET (US)   Profile for SteviLad   Send Email to SteviLad  
I currently own a 2000 Dauntless 14 with a 50 HP Yamaha High Thrust 4 Stroke . I purchased this boat new 3 seasons ago, & have had a great time with it. I am primarily a sailor (J/32) & I am not very familiar with outboard motors. The Yamaha runs a 13.5 inch prop with a 15 pitch. I can generally get 5100 RPM's & 30 MPH with just one or 2 people. I am unable to get the boat up on plane, or past 12 MPH, with 4 adults, even though it's rated @ 750 Lbs, ...& we're considerably less. Will a prop size or pitch change help me get some improved performance? Its very expensive to trade up to a 75 HP motor, & its alot of addl. weight on the transom. The Dol-Fin addition to the motor also made a big difference.
JohnJ80 posted 08-18-2003 01:13 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
I am not sure what your max RPM range is (consult your owners manual on the motor). But if you are not in the range at WOT with a normal load on board, then you have the wrong prop.

Also, you need to look at your motor placement. If you motor is too low, you will be generating a ton of drag. Whaler recommends that the AV plate be at 0-3/4" ABOVE the bottom of the boat. Conventional wisdom on this site seems to say that you should be 3/4" to 1.5" above the bottom of the boat.

What we have seen over and over on this forum is that dealers mount the motors way to low. The one exception to this rule seems to be Whaler deals selling Merc since they follow the whaler guidelines above.

I repowered this year. My dealer mounted the motor all the way down and the performance stunk. I fiddled with it, added a fin and wound up raising it to the top hole (all the way up). Now it runs fine.

I am not familiar with Yamaha engines, but if you could report on your hole position (vertical position of the motor) and the prop that you have on the boat (marked in the prop usually) plus the RPM at WOT, that would help.

J.

SteviLad posted 08-18-2003 11:24 PM ET (US)     Profile for SteviLad  Send Email to SteviLad     
Thanks for the reply. The optimal range reported on the Yamaha website is 5000-6000 RPM's......which is quite a range. I currently have a 13.5 inch 15 pitch prop on the boat. I will check the motor height next time I am at the marina, since it stays in a fresh water slip thru the summer. I can currently spin at 5100 RPM's & 31 MPH with just myself in the boat . I was considering dropping down to another aluminum prop with a 13 inch pitch...or possibly an 11 inch. I also noticed that the diameters of the props vary, with many dropping down to 11 inch versus my current 13.5 inch. Lots of decisions. What are the downsides to going to a lower pitch, or smaller diameter?

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