Prop my F150

[Yamahaha]

I just tried my new Yamaha F150 yesterday with a 13 3/4 X 19 SS prop (left over fm my old 200 hp), and it maxed out at 5600rpms. Its on a 19' Grady '91, total package with two people and full tank about 3300 lbs. My goal is higher top end instead of better hole shot. Should I try a 13 3/4 X 17 or a 14 1/4 X 18. I don't quite understand how the diameter of the prop can alter the rpms.

 

[bigbrownbuku]

Re: Prop my F150

the 17 will get you much closer to the target rpm of 6000 but you might lose 3 or 4 mph. 5600 isnt a bad rpm for that engine but it is working a litle harder then say if you had the 18 or the 17.<br />more blade area to turn = more work to do.

 

[JRJ]

Re: Prop my F150

Can't help you with the prop, but I am interested in the F150. How many hours do you have on it and how do you like it? Ease of service? ie: big mess? or well thought out. Thanks

 

[mark n dark]

Re: Prop my F150

I HAVE NEW F150 WITH 13.3/4 X 17 WITH 20 HRS MOUNTED ON 24 FT PRIVATEER 10FT BEAM TOP SPEED 38MPH @ 5600 RPM GETTING THE BEST FUEL ECONOMY ALMOST 4MPG@ 3000RPM AND 20MPH. WAS THINKING OF TAKING MY OLD PROP (WAS OFF 200HP) WHICH HAD A LARGER PITCH 14.1/2 X 17 FOR MORE SPEED(OLD SPEED WAS 44 MPH) BUT DEALER SAYS FUEL ECONOMY WILL DROP.

 

[Tacklebuster]

Re: Prop my F150

I have a 21' NorthRiver Seahawk that is powered with the F150. It came with a 13 3/4 x 19 aluminum prop from the dealership. I could only crank out about 5400 to 5600 rpm's max out of her until I put a 17 on her. Now she will get 6000 fully trimmed up at wot. I lost a few miles per hour in the deal but can still run about 44 miles per hour. Our boats weigh about the same so your results should be close. <br /><br />If you want more top end speed, spend the cash and get you a stainless steel prop.