What Prop To Use?

[Brad S]

I have a 2002 Honda 9.9 power thrust 25" shaft. My boat is a 1992 16' valco bayrunner and weighs approx. 230 lbs. The honda was used as trolling motor for a 24 Wellcraft Coastal W/A. I sold the Wellcraft but kept the Honda. The first time I tried to use the Honda I lost the prop shaft and prop (prop was brand never used).
I intend to use it on the bayrunner for this summer. I don't remmeber the pitch or dia.

My question is what blade/dia/pitch should I use for this size of boat. I know it is not enough to plain the boat out, but at least I will be able to use it this summer trolling and getting from point A to B (would like to get there a quickly as possible).

Also, does anybody know what 16 Valco Bayrunner, 1992, side console steering with a 25" transom would be rated for?
I have asked Klamath as theyt bought Valco and they were no help. I have estimates ranging from 45hp to 90 hp.

Thanks
Brad

 

[steelespike]

Re: What Prop To Use?

Don't know why it wouldn't plane a 230 Lb boat unless its not intended to plane or your going to load it down. A 9.9 should be good for about 21mph
on a reasonably light boat 230 sounds light to me. Are you sure its 230lbs with a side console and a 25" transom?I think Honda is your best bet for prop size unless someone here has a similar setup. I know nothing about the Valco
but a 25" transom on a 16 ft boat seems unusual to me.

 

[Brad S]

Re: What Prop To Use?

Thanks for the reply -
The plate on the boat with the information says it is a BR-15. I can barely make it out. It actually measures 15'-10". The max hp rating is worn off. My beam on this boat is juest under 5'-8" at it's widest point. NADA Guides says this boat weigh 240 lbs.
As for the transom, it had been cut down to accomdate a 20" shaft motorby the previous owner (I'm going to restore it to it's original height). The wood on the transom was bad so I removed it for replacement. When I did, under the cut out portion of the transom was writing in permanent blue maker ink saying - 25" trans.

I don't understand "honda is my best bet... Do you mena I should call a Honda dealer?

Thanks
Brad

 

[steelespike]

Re: What Prop To Use?

Yes A good dealer should be able to recommend a prop.
There is a fellow hwsiii on here with a program that can select props if enough info He will need the gear ratio among other. Check some of the other posts You find him
Signs H

 

[hwsiii]

Re: What Prop To Use?

Steele is right, it should do about 21 to 22 MPH with a 9" x 12" aluminum prop. Here are my calculations for that motor with a 12" Pitch prop and a total allup weight of the boat at 800 pounds Brad. Thank you steele, and I found the gear ratio on your motor to be 2.41 Brad, check this for me please.

H

 

[Brad S]

Re: What Prop To Use?

Perfect. The help is appreciated more than I can say.
I will check out the gear ratio and get back to you.
Again, thanks for the help.

Brad

 

[hwsiii]

Re: What Prop To Use?

Brad, you are very welcome.

H

 

[steelespike]

Re: What Prop To Use?

Isn't nice when things come together?

 

[Brad S]

Re: What Prop To Use?

Big Yes on that

 

[Brad S]

Re: What Prop To Use?

I found an old prop for the 9.9 Honda that I can get free. It's blades are a little dinged up but definitely fixable. It is a Honda prop 4 blade 9-1/4 x 8 (inch)
Would this work for my application?

 

[hwsiii]

Re: What Prop To Use?

I am thinking with the change in diameter and the 4 blades you are probably going to max WOT at about 6,100 to 6,300 RPM and about 16 miles and hour. You need to buy a Tiny Tach so you can make sure you don't over spool the motor too much with the RPM, it only cost about $ 40. Hopefully it will go fast enough to plane, but I am not positive it will. Free is a good price, try it you have nothing to lose.

H

 

[Brad S]

Re: What Prop To Use?

I agree with the tach. Going to get one this weekend and hopefully I'll be rigged by next weekend to try it out.

Again thanks for the help.

Brad

 

[hwsiii]

Re: What Prop To Use?

Brad, you are very welcome and please get back with me on the speeds and RPM you get from this prop for my database.

H

 

[Brad S]

Re: What Prop To Use?

Will do

Brad