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Old 10-25-2018, 03:33 PM   #14
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Default Re: Surface drive help





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Originally Posted by orangefeetdown View Post
off course ? I have a 2016 Yamaha 40 HP tiller and I cant get my boat on plane with 2 guys and gear no way my blind is that heavy? My question is would a 4 blade prop make a big difference i mean I am plowing I have 16ft xwide/deep coast gaurd front with pods.
What size boat?
Have you checked the mounting placement?
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Old 10-25-2018, 04:14 PM   #15
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Originally Posted by Gude View Post
What size boat?
Have you checked the mounting placement?
1672 coast gaurd front I did not check mounting placement it's as high as it can be on transom i believe
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Old 10-25-2018, 04:27 PM   #16
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Default Re: Surface drive help

Guessing it's 72 at the top, so probably a 1650 or 1654.
That is plenty of power to push that boat with a good load. I would first check the suggested mounting position, then your prop pitch.
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Old 10-25-2018, 05:43 PM   #17
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Default Re: Surface drive help

yes i believe it is at the top 72 Should I stay with 3 blade prop and go lower pitch? I'm pretty sure it is mounted correctly same holes last 2 motors have been in.
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Old 10-25-2018, 06:02 PM   #18
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Default Re: Surface drive help

I've found on Outboards when pushing heavier loads a big round ear prop with more diameter and a flatter pitch works well. A four blade would help only if you were trying to get more trim angle and running prop near the surface, the extra blade would help prop bite beings there would always be two blades in water. Big round ear props are used on pontoon boats a lot.
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Old 10-26-2018, 08:12 AM   #19
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Default Re: Surface drive help

Pitch man, Pitch!

Pitch is like the gear in a transmission or differential. If your in to high of gear what happens, or to low of gear ratio in a differential when pulling a heavy load with truck? Answer, you get no take off power... Right now your engine simply doesn't have the power for the pitch of prop you have.

Also, the prop slipping in the water when accelerating is comparable to the "clutch" of a transmission.

So a four blade like Denny said will "grab" the water even more making your problem worse. Raising your motor is not going to make a difference for your boat or situation of plowing, other than the benefit of when being on plane it might run 1 or 2 mph faster because of less drag in the water and maybe 1/2" shallower.

Asking for recommendations based on boat size, load, mtr size to anybody will give you a good start in respect to pitch and that's it. Getting on the water with a tach is the real test and only way to really do this right. A Tiny Tach (M model for outboards) is only like 30-40 bucks.

I would start by dropping the current pitch by two, blind, decoys, and dog with just you and shooting for 5700 to 5900 rpm. If shy of that drop the pitch again by 1.

Also, the units of pitch is inches. Meaning with no slip a 12P prop will advance through the water 12" in one revolution. So the less pitch the less distance traveled in one revolution, comparable to a lower gear ratio.

Pitch is the most important factor in a prop, not diameter (within reason of course) and not blade count. Diameter and blade count are only fine tune parameters and a boat plowing is a along ways from that.

For a good starting point of pitch I would call Starks in pdc. They will get u in the ball park and the best prices around on props.

Last edited by jmatura; 10-26-2018 at 08:38 AM.
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Old 10-26-2018, 09:23 AM   #20
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Default Re: Surface drive help

On another thought, you might check the gear ratio in the lower unit. Some motors are geared 2.1 or 1.84.1. that will make a difference on the load carrying and what prop is best. Some motors that are used on pontoon boats are geared different from factory if they are used on pontoon boats. Putting a small diameter prop with a lot of rake and pitch won't push a load very well. Had a friend buy a boat motor combo, and it was set up with a motor that was suppose to be on a pontoon boat, didn't work well on a 18' jon boat. Motor was running very high RPM. Dealer finally changed out lower unit so he could run the right prop.
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Old 10-28-2018, 02:37 PM   #21
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Modified Vee hulls are notorious for shitty performance especially with short tails.
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