Prop size advice. Marlin F300s

[NikM820]

I just repowered my 2005 Marlin with Yamaha F300s. I had a set of merc rev 4 s 15 diameter 17 pitch but can't use the rev 4 with the new yamahas. We tried a set of 4 blade turbos 14.5 diameter. 19 pich 5400 rpms max and 15 diameter 19 pich 3 blades with max rpm 5300. With the 15 diameter 19 pitch 3 blades I was able to get to 5900 rpms with my f250s. The motors are brand new and I know breaking them in I should get a few more rpms but can't see 400/min . On the grady white website their specs are with a 15.5 diameter and 17 pitch 3 blade. I really want a 4 blade prop for the midrange fuel economy running in the crap I'm usually fishing in. Using the standard pitch formula when going from a 3 blade to a 4 blade you keep the same diameter and drop the pitch by 2. This would give me 15.5 diameter with a 15 pitch.
My question is, you guys with Marlins with f300s, what props are you using, what's your max rpm, what hole are your motors mounted in and how's your economy?
Thanks
Nick

 

[devildogdad]

give these guys a call, I have only heard good things about them. http://www.propgods.com/Content2/Default.aspx

 

[NikM820]

Thanks. I have been In Contact with Ken but really I want to talk to some people who have run the new engines and found a prop for their Marlin. All the theory in the world doesn't compare to spinning the props offshore.

 

[devildogdad]

well let me know what you find out, I have a 2012 Marlin with 300's and whatever the factory put on.

 

[NikM820]

How your performance offshore?

 

[REBThunderroad]

Nick,

PM Me on your props. Thanks

Rob

 

[devildogdad]

if the performance question was to me, I get about 1.3 MPG at 4100 , full fuel, usually 6 people and gear on board. I go 60 miles off shore here on the west coast of Florida so can be an expensive weekend.

 

[NikM820]

1.3 would be great for me. If I can't find a good set of 4 blades I'm going to go with the 15.5 17 pitches they spec the boats with.

REB I sold my props to the dealer, he offered me more than I planned to sell them for so I took it.

 

[REBThunderroad]

Thank Nick. Ill keep watching your performance posts as I am curious on how you like them/worth the upgrade.

Any thoughts on if you think the powertech 18" x 15 1/4 4 blade props may be a better fit on a Marlin with F250's pitch then the 17" rev 4 blades you were running?

Rob

2005 Marlin 300

 

[NikM820]

Not sure man. I was able to get 5900 rpm with the 15 diameter 17 pitch props so I don't think you're going to want anymore pitch.
The new yamahas are geared differently and Gw specs them with 15.5 diameter, 17 pitch 3 blades. I ran offshore the other day with my old 15.25 19 pitch props and was get surprised at the performance I was able to get. The new engines really have a lot of power and there isn't that falling off a plane when you hit a wave affect that I hated so much about these props with the old engines. My new props are the 15.5 17 pitch sds props and we will see how those preform and I will post my performance numbers.

 

[REBThunderroad]

Thanks for the info Nick! You probably told me but do you remember what your WOT number was with your 17" rev 4's? I appreciate your help.

 

[NikM820]

Not specifically but if you search my posts you will find them. Truth is I got better numbers in the river no doubt with the 4 blades and it handled better offshore but I never got more than 1 mpg offshore.