yamaha prop

[cleve]

i upgraded to a yamaha 60 2 stroke and took it for a test run today. i have a 1648 grumman semi-v hull. weight? maybe 500-600 lbs. not sure just a guess. the motor has rpm range of 5000-5500 and a 19 pitch prop. wot rpm's hung around 5500-5800 and top speed was 38-39. hole shot is tremendous! should i go with a 21 pitch? if so, what changes could i see? aluminum or stainless? name brand prop? there were 2 people(430lbs.),2 batteries, trolling motor, 2 coolers, and fishing gear and it gave us whiplash out of the hole, so i'm thinking higher pitch. figured i'd ask the experts.

 

[steelespike]

Re: yamaha prop

A 21 pitch would put you at about 5,400 more or less.
little less hole shot and a little more speed.If your looking for more speed
The hustler turning point is said to be effective.Was your speed by GPS?Pitot speedos are not very accurate.
What year is the 1648?Depending on the year there could be many versions.
Most are rated at 25 or 30 hp.

 

[cleve]

Re: yamaha prop

speed was on a gps. boat is a 1998 and rated for a 50. would you recommend a hustler? what are the performance differences between aluminum and s.s?

 

[steelespike]

Re: yamaha prop

If I was upgrading my prop I would consider the Hustler because it delivers performance for a good price.Stainless is stronger than aluminum can be built to a more sofisticated design.Will usually improve hole shot,speed and allow higher motor setup while resisting blowout/ventilation.

 

[cleve]

Re: yamaha prop

could i go with a smaller diameter prop on my motor , i think the mercury 60 2 stroke had a 10 or 11" where mine is 13.25" and it looks big to me. the gear ratio is 2.33-1 so that means it is similar to the merc. bigfoot right? the hustler webpage shows a top speed of 56 with a merc. 60 on a 16' alumicraft. they did not say whether it was a 2 or 4 stroke or if it was a bigfoot. should there be 16 mph difference between the merc. and my yamaha on a similar boat. i thoght all horsepower was created equal, it was the 'variables' that made the difference. if so, what could i do to acheive 45-50 mph?

 

[cleve]

Re: yamaha prop

anyone?

 

[Irv964]

Re: yamaha prop

The "X" dimension or diameter is usually not much of a concern, it boils down to what prop manufacturer and pitch you use which will determine your diameter.
Check out www.turningpointpropellers.com or any other prop manu and see what it recommends as far diameter goes, what ever pitch and prop you choose will determine your proper diameter.
I doubt you will ever see those speed numbers your after? Any motor, once it's max rpm is reached will only given what ever given speed you have, rarely any more. I got an extra 2mph when I switched from a black max to a Turning Point prop and from what I understand I was fairly lucky to see that.
If I were to put a 23 or 25 Pitch prop on I would not see a 10mph increase, it doesn't work that way........Irv964

 

[cleve]

Re: yamaha prop

if i went with a 21 s. steel is there a difference than an aluminum. i think i read that s.s. is like 2" more pitch than a comparable aluminum. would you recommend turning point express?

 

[Randybeall]

Re: yamaha prop

Yes, there is a difference from alumnium to stainless steel. Stainless is a much stronger metal, will not flex or give where alumnium will. This allows thinner blades, more complex cupping and rake designs which move water more efficently. That means when you change from al to ss you throw all your research on al out the port hole. If your going to do that, then find a supplier like iboats who will allow you to buy then exchange the prop if it is not right. I would suggest the 21 ss turning point express, as a starting point. It could over prop the engine since it will put more energy into the water in a given size, but if you can exchange then you could go back to the 19. You are just about to the point of 'pay your money and take your chances'. Happy Boating.

 

[cleve]

Re: yamaha prop

should i go with a yamaha prop or a turning point express? stainless steel is what i'm leaning toward. someone told me yamaha props are the best, is this true?

 

[Irv964]

Re: yamaha prop

should i go with a yamaha prop or a turning point express? stainless steel is what i'm leaning toward. someone told me yamaha props are the best, is this true?

I've heard the same about Merc props, some people won't use anything else!
From what I have learned on here, there is no one perfect prop, you have to do your homework by reading lots of posts/testimonials etc to figure out what "you" think will work best for you.
I love my Turning Point prop, (it gave me everything I was after and more) but that doesn't mean you will? Your best bet is to use iboats prop exchange if you can, that way you can play around with different manufacturer's and prop's.
I have heard great thing about Stiletto props, in fact I was very close to purchasing one but I figured for the price of my Turning Point prop it was worth the risk to try one of their's first, and I happened to get lucky........Irv964

 

[steelespike]

Re: yamaha prop

could i go with a smaller diameter prop on my motor , i think the mercury 60 2 stroke had a 10 or 11" where mine is 13.25" and it looks big to me. the gear ratio is 2.33-1 so that means it is similar to the merc. bigfoot right? the hustler webpage shows a top speed of 56 with a merc. 60 on a 16' alumicraft. they did not say whether it was a 2 or 4 stroke or if it was a bigfoot. should there be 16 mph difference between the merc. and my yamaha on a similar boat. i thoght all horsepower was created equal, it was the 'variables' that made the difference. if so, what could i do to acheive 45-50 mph?

56 on an aluminum boat with 60 hp is exceptional.most would run in the high 30s to low 40s.Perhaps the boat was stripped down no frills,really light.The Hustler prop will produce higher speeds than the typical aluminum prop but a simple prop change is not going to produce a 16mph increase.Nor will there be a 16mph difference brand to brand same application.
They wouldn't likely test a bigfoot on a light boat as they are intended for heavy applications like pontoons.

 

[cleve]

Re: yamaha prop

i find it hard to believe that top speed of a 60 merc. on an alumicraft 16' is 56, but they claimed it on the performance tests. i would think it's almost impossible. my boat is slightly overpowered and i have high gear ratio which is why i thought i could go more aggressive with pitch. i'll agree with randybeall, i just have to buy and see what happens and exchange it if it's not right.