Buying a Sharrow propeller for my 27OB

Did you get your Sharrow prop? If so, what's your opinion?
 
It may be the jetlag, but my math says that a 20% improvement will pay for the prop in... 30 fillups on my 27?

That doesn't seem right
 
Bump! @Red-27 or @visionman, any luck getting a Sharrow prop? Hoping that several months later maybe those deliveries has shown up and folks have first-hand experience with RangerTugs using these props. I have a R-29CB and would be very interested in running more efficiently, especially with current diesel prices.

Regards,
-Darryl
"Little Blue T"
 
gregc":1y28gq7t said:
It may be the jetlag, but my math says that a 20% improvement will pay for the prop in... 30 fillups on my 27?

That doesn't seem right
Click to expand...
$5000 savings at 20pct would mean I spent $25k in fuel.
At $4/gallon that’s 6,250 gallons. I usually fill up 100 gallons at a time, so 62 fill-up’s If my maths correct.


Sent from my iPhone using Tapatalk
 
So, the savings are.... realized over multiple years (in my case).

The performance and increased range seem to be the "sell" for me here, I just need to decide if it's worth $5k.

I'm hoping that the Yamaha announcement / manufacturing does something on the price point
 
My prop was finnaly delivered on the 10th. i plan on putting it on this week and testing it when the weather calms down near me
 
Can’t wait to hear your initial impressions and results! I’m really considering one for my R25 with the Yamaha 250 OB, which is basically the same 4.2L V6 on your 27, just tuned up to 300HP. I’m definitely interested in seeing some results on fuel consumption on a Ranger Tug, but also all of the other purported benefits of low-speed handling, reverse power, planing RPM, and noise reduction. If there’s appreciable “check marks” by most/all of those, it will be hard not to justify the upgrade…
 
Posting to watch this thread
 
You're building up an anxious audience, Red-27! ;-)
 
after alot of bad weather I finally got a few nice days to test out the prop this weekend. the results were not great my usual crusing speed is 28-33 mph depending on wind and wave conditions and my average MPG in the 2022 season was 1.48mpg with the prop from the factory. my top speed was 37mph. with the sharrow prop my topspeed is 32mph which I expected but i went down to 1.2-1.3mpg at my usual cruising speed in order to gain any mpg my new cruising speed would have to go down to 20mph where i now get 1.55mpg. it seems to be more efficent at slow no wake speeds but i didn't pay much attention to that with my old prop as i do not spend alot of time going that slow.

I talked with sharrow today and sent them the information i collected and they are sending it to their engineers to review. so i may be exchanging my sharrow prop for another sharrow with a different pitch this winter. the company representatives seemed friendly every time i talked with them so far. hopefully next season ill be able to report better results and the data i sent sharrow will help other ranger owners in the future.
 
Red-27":pyx9obr3 said:
after alot of bad weather I finally got a few nice days to test out the prop this weekend. the results were not great my usual crusing speed is 28-33 mph depending on wind and wave conditions and my average MPG in the 2022 season was 1.48mpg with the prop from the factory. my top speed was 37mph. with the sharrow prop my topspeed is 32mph which I expected but i went down to 1.2-1.3mpg at my usual cruising speed in order to gain any mpg my new cruising speed would have to go down to 20mph where i now get 1.55mpg. it seems to be more efficent at slow no wake speeds but i didn't pay much attention to that with my old prop as i do not spend alot of time going that slow.

I talked with sharrow today and sent them the information i collected and they are sending it to their engineers to review. so i may be exchanging my sharrow prop for another sharrow with a different pitch this winter. the company representatives seemed friendly every time i talked with them so far. hopefully next season ill be able to report better results and the data i sent sharrow will help other ranger owners in the future.
Click to expand...

You can let Sharrow know there's a lot of RT-27 outboards out there... I'd estimate there to be at least 400. Not everybody would upgrade to a Sharrow... but once they figure out the correct size prop, they'd sell a lot of prop's. If the Sharrow prop performs as they advertise, I'd buy one.

The most important factor in sizing the prop is what is the RPM and speed at WOT?
The factory 3 blade (15.75x15) and Power Tech 4 blade (15.25x15) have a WOT of 5600-5800 RPM, and speed of 39-40mph.

The F300/250 need WOT to be between 5,000 and 6,000 RPM. But prefer WOT to be close to 6,000 RPM.

I'd be willing to work with Sharrow on sizing the prop for the boat, doing performance testing, etc... Even through the off-season as I can pull my boat out anytime to swap a prop and I keep her in the water year-round as we boat year-round.

With the PowerTech 4 blade prop, I have seen 1.5mpg at 24mph, and my top speed is 39mph.

https://www.letsgochannelsurfing.co...kxcs0cum-aa3076ef-2a33-441b-860a-294d5859acd1
 
Great point Submariner. I've got a 25 with the F250, and expect there's a fair amount of those out there as well.

I'm definitely curious about your experience thus far - most of the performance advantage of the Sharrow can be boiled down to the concept of it having less slip than any other prop, and sometimes dramatically so, in testing.

That should loosely translate to lower engine speeds needed to get on and stay on plane, as well as higher vessel speeds at every engine RPM, other than at WOT and top speed, where a conventional prop starts to outperform the Sharrow (but that's an area where few operate for very long)...

So with that, I'm surprised that you actually had lower MPG at your regular cruising speed - what was the engine RPM at that speed? Same as with the standard prop? Higher? Lower?

Did you find that you were getting/staying on plane at lower RPMs, or was that also the same or potentially worse (higher RPMs)?

Any comments on the noise levels, low-speed handling and reverse thrust, high-speed handling? These are all the other less measurable touted improvements that I am probably equally as interested in as efficiency/fuel savings.

Hope the Sharrow folks help you dial something in - definitely sounds like the prop was not a great match for the motor or boat or both, which is surprising.
 
I just bought a new R23 and interested in this prop, how did it work out on your 27?
 
Red-27":17ixaf77 said:
after alot of bad weather I finally got a few nice days to test out the prop this weekend. the results were not great my usual crusing speed is 28-33 mph depending on wind and wave conditions and my average MPG in the 2022 season was 1.48mpg with the prop from the factory. my top speed was 37mph. with the sharrow prop my topspeed is 32mph which I expected but i went down to 1.2-1.3mpg at my usual cruising speed in order to gain any mpg my new cruising speed would have to go down to 20mph where i now get 1.55mpg. it seems to be more efficent at slow no wake speeds but i didn't pay much attention to that with my old prop as i do not spend alot of time going that slow.

I talked with sharrow today and sent them the information i collected and they are sending it to their engineers to review. so i may be exchanging my sharrow prop for another sharrow with a different pitch this winter. the company representatives seemed friendly every time i talked with them so far. hopefully next season ill be able to report better results and the data i sent sharrow will help other ranger owners in the future.
Click to expand...

I'm not surprised to read this. I've been working with Sharrow for some time and, unfortunately, can't say how it's going since I was required to sign an NDA. I appreciate reading your reports and comparing with what I'm seeing. Of course, we all hope to see results similar to those being published, e.g. https://www.sharrowmarine.com/perfo...ail&utm_term=0_ef39558cdc-a48304bd36-76180977
 
I thought this article might be of interest to those following this thread. https://flip.it/vk6JVh. It seems like this concept is also being applied to aircraft. The article also talks about Sharrow, but is overall focused on toroidal blades in general.
 
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