4:02 Without having a sharrow prop to compare, I would see that 2000rpm is the spot for fuel economy slow comfy mode and 4500 is the best compromise to go where I want quickly. In that case I would beat the sharrow that has an indecent price point. Despite cavitation, I can buy maybe 5 or more regular props with the money. Thank you so much for this seemingly honest review.
I don't get some of this chart. I'm guessing that running the diesel engines at 4,000 RPM would require the same amount of fuel regardless of the prop. Yes? If not, why not? So - at 2,500 RPM the Sharrow props push the boat 10% farther but get FEWER MPG? How is that possible? But no matter what is going on otherwise, the speed gain in the sweet spot is impressive.
the cavitation is different at diff RPMs and engines have diff power at diff RPMs... so you need a prop that could adjust itself to optimize at all RPMs . or complex computer models. I think they customize it to the RPM/power you tell them so if you have a major boat and do 10s or 100s of miles at a cruise RPM then it makes sense to get.
doesn't it really mean that the original prop is optimized for 5000-5500 ... and the sharrow for -1k lower ? idk have to compare more designs I think ..
Given what I know about toroidal props I am not sold on the promises. Considering they have turned comments off on their own video's I think I may not be the only one. Toroidal props have been seen to create vortexes which interferes with the flow of water causing a lower efficiency, meaning more fuel to get the same power. Unless Sharrow have found a way to beat physics. Also the "no cavitation" claim is easily provable bs. It is physically impossible to spin a prop that fast and not cause cavitation.
Good investment in your boat's performance and efficiency! Way to Go!
Just in, new Sharrow MX-A props starting at $1995 and up now available for more model engines! Check it out!
4:02 Without having a sharrow prop to compare, I would see that 2000rpm is the spot for fuel economy slow comfy mode and 4500 is the best compromise to go where I want quickly.
In that case I would beat the sharrow that has an indecent price point. Despite cavitation, I can buy maybe 5 or more regular props with the money.
Thank you so much for this seemingly honest review.
Stunning difference at 4000RPM: 50% more speed *and* 35% better fuel economy!
Good review. Price point at 5k each is too much especially on a triple 450 boat. Maybe they will come down once more people purchase them.
I don't get some of this chart. I'm guessing that running the diesel engines at 4,000 RPM would require the same amount of fuel regardless of the prop. Yes? If not, why not?
So - at 2,500 RPM the Sharrow props push the boat 10% farther but get FEWER MPG? How is that possible?
But no matter what is going on otherwise, the speed gain in the sweet spot is impressive.
the cavitation is different at diff RPMs and engines have diff power at diff RPMs... so you need a prop that could adjust itself to optimize at all RPMs . or complex computer models. I think they customize it to the RPM/power you tell them so if you have a major boat and do 10s or 100s of miles at a cruise RPM then it makes sense to get.
doesn't it really mean that the original prop is optimized for 5000-5500 ... and the sharrow for -1k lower ? idk have to compare more designs I think ..
Id love to see 3900 & 4100rpm :)
Given what I know about toroidal props I am not sold on the promises. Considering they have turned comments off on their own video's I think I may not be the only one.
Toroidal props have been seen to create vortexes which interferes with the flow of water causing a lower efficiency, meaning more fuel to get the same power. Unless Sharrow have found a way to beat physics.
Also the "no cavitation" claim is easily provable bs. It is physically impossible to spin a prop that fast and not cause cavitation.
i think they tweak it for your application/RPMs you want to use. but prob other methods to improve efficiency .
Not worth 5k
It's a $400k boat, so $10k for props is 2.5% hit; they might save $150/day, so payoff may be 70 days on the water.
Very noticeable difference at 4k rpms