Sharrow Props

Edmund said:
So - is the following correct with a Performance Tune to 335 (I can get 89) and the 5 blade: -- I should see more hole, more mid range, more reverse control and low speed control over all, and probably enough HP to over come the drag of the 5th blade and maybe another 1-2 at the top?
Click to expand...

I know a boater who's running that combo (PT SCE5 + NizPro Perf tune). He's on the East coast. I txted him. He says he can't remember his WOT, but that it was faster than before the tune. (He flashed his F300 last October, and has only ran the boat a few times since).

My advice, hang on. 😀

ChannelSurfingWheelie.png
 
Lemondrop sent me this photo from her 2019 R27-OB.

33mph at 14.4gph = 2.29mpg.

Lemondrop had her F300 flashed with the NizPro Eco tune and runs the PT SCE5 Channel Surfing edition prop.

671527461_2202725120471620_7318929609913330694_n.jpg

IMG_6809.jpeg
 
Rocky Lou said:
Thanks for posting Martin. I've also been working with PowerTech for some time after I gave up on Sharrow.

I'm current running 17" OFS - 5 BLADE props and, as you have experienced. I get better hole shot, stern lift and mid range performance. However, I lose top end, compared to SS2s, reaching only 5100 vs. 6000. It's important to note that my C302c LE presents a substantially different issue than your R27, that I consider to be a more 'standard' and performant hull. My boat is extremely stern heavy, a real a$$ dragger, with a generator and gas tanks located aft. Stern lift is the most important factor for improving my boat's performance.

Given the lack of top end, PowerTech will be sending me: OFS5L15PCL200 (LH)/OFS5L15PCL200 (RH) with hopes that we keep the mid range and improve top end. I also will check whether the 'SCE 5 Blade/Channel Surfing' props are an alternative. I only dream of seeing numbers like 1.8 MPG, realizing that I have twins, but at least I now see 1.0 MPG at cruise, which is a far cry from 0.7 MPG.

Also, for those who are planning on performance testing and want it all done for you with graphs, I attached the link to the VDR that I have installed.
Click to expand...
Paul, what's the WOT rpm of the 15P OFS5 versions from previous 17P versions? Are you running the extended exhaust barrel as well?

I loved our Turning Point Mach-4 Express 15.5x15P dual geometry, but had similar issues, WOT rpm reduced to 5300. Running the TP Mach-3 OS in 13P or Mercury Enertia in 14P I can reach 5900-6000. I would've like to try the Turning Point Mach-4 Express dual geometry in a 15.6x13P, but only if I can borrow one!
 
Rocky Lou said:
Linux (RHEL), my company made a fortune selling 'free software' and we helped put my prior company, Sun, out of business along with much lower cost, non-proprietary processors. IBM bought us for $32B, we were born cheap but sold expensive.

You need to offer enough value to justify the price and if many of your potential customers are not believing it, and have been publicly disparaging the products, then it's not doing Sharrow any good to keep going down that path.

Sharrow has been going at it for years now...I know some key execs. who bailed.
Click to expand...
If I remember our support contract correctly, RHEL was only free in theory. 😉

But, I digress. Let’s get back to boats.
 
cliffm said:
Paul, what's the WOT rpm of the 15P OFS5 versions from previous 17P versions? Are you running the extended exhaust barrel as well?

I loved our Turning Point Mach-4 Express 15.5x15P dual geometry, but had similar issues, WOT rpm reduced to 5300. Running the TP Mach-3 OS in 13P or Mercury Enertia in 14P I can reach 5900-6000. I would've like to try the Turning Point Mach-4 Express dual geometry in a 15.6x13P, but only if I can borrow one!
Click to expand...
I can’t answer for Paul but we have the OFS5 16 pitch with the ext tube and can get 5700 area.
 
cliffm said:
Paul, what's the WOT rpm of the 15P OFS5 versions from previous 17P versions? Are you running the extended exhaust barrel as well?

I loved our Turning Point Mach-4 Express 15.5x15P dual geometry, but had similar issues, WOT rpm reduced to 5300. Running the TP Mach-3 OS in 13P or Mercury Enertia in 14P I can reach 5900-6000. I would've like to try the Turning Point Mach-4 Express dual geometry in a 15.6x13P, but only if I can borrow one!
Click to expand...
Missed this earlier. I've posted detailed reports elsewhere, however, I declared victory, with 5 blade OFS 16s with extension tubes, after years of testing. Along with about 30% improvement at mid range (over OFS2s), WOT is 5500 RPM/45 MPH. I did not run 5 Blade OFS 15s, however, I ran several other 15P props that did not give me enough stern lift. I consider 5500 RPM to be the bottom of the acceptable range. However, compared to what I originally purchased, overall performance is like a 'new boat'.
 
Rocky Lou said:
Missed this earlier. I've posted detailed reports elsewhere, however, I declared victory, with 5 blade OFS 16s with extension tubes, after years of testing. Along with about 30% improvement at mid range (over OFS2s), WOT is 5500 RPM/45 MPH. I did not run 5 Blade OFS 15s, however, I ran several other 15P props that did not give me enough stern lift. I consider 5500 RPM to be the bottom of the acceptable range. However, compared to what I originally purchased, overall performance is like a 'new boat'.
Click to expand...
Fascinating report. In general, would you recommend going up in P if you go from a 4 blade to a 5 blade?
 
Edmund said:
Fascinating report. In general, would you recommend going up in P if you go from a 4 blade to a 5 blade?
Click to expand...

The PowerTech SCE5-15-EXT (Channel Surfing edition, 5 blade, 15 pitch, extended exhaust tube) has been tested on a Cutwater 24 with good results. A boater reached out to me from the Everett area several months back, as he bought one, to go out and do detailed testing. He txted me that with the prop he gets up on plane in 1/2 the time as before, and his WOT RPM's are between 5800 and 5900 RPM. He's very happy with the prop. (He also did the NizPro tune as well).
 
Submariner said:
The PowerTech SCE5-15-EXT (Channel Surfing edition, 5 blade, 15 pitch, extended exhaust tube) has been tested on a Cutwater 24 with good results. A boater reached out to me from the Everett area several months back, as he bought one, to go out and do detailed testing. He txted me that with the prop he gets up on plane in 1/2 the time as before, and his WOT RPM's are between 5800 and 5900 RPM. He's very happy with the prop. (He also did the NizPro tune as well).
Click to expand...
My boat is so much better than it used to be....getting a new 4 blade and then a year later adding the SK Ride......but it still is awful in reverse around the dock. Since I had great results re propping two boats with Ken...including this one several years ago - when the CS 15p 5blade was not available ,I may touch base with him again.

In your opinion....will going to 5 blade be felt around the docks in Reverse?
 
Edmund said:
My boat is so much better than it used to be....getting a new 4 blade and then a year later adding the SK Ride......but it still is awful in reverse around the dock. Since I had great results re propping two boats with Ken...including this one several years ago - when the CS 15p 5blade was not available ,I may touch base with him again.

In your opinion....will going to 5 blade be felt around the docks in Reverse?
Click to expand...

You will notice a difference. I rarely ever use my bow thruster as a result. Also, they are only available direct from PowerTech.

Propeller | LetsGoChannelSurfing

csurf.co csurf.co
 
Last edited:
Edmund said:
Does Ken at PropGods not use PowerTech? I thought that was the brand he was involved with. Then again, my brain.....
Click to expand...
Yes, he recommended PowerTech and NizPro to me years ago. However, he may not be following all the work that's been done by Submariner, et al, specifically for our FM boats...that information is available within Tugnuts.
 
Edmund said:
Does Ken at PropGods not use PowerTech? I thought that was the brand he was involved with. Then again, my brain.....
Click to expand...

The PowerTech "Channel Surfing" edition is a patent-pending propeller design that I spent a year (2024) working with the owner of Powertech on. They designed it, I did all the testing and collaboration with PowerTech. I suggested they go to market with it. PowerTech filed the patent and has not released the "Channel Surfing" edition to the dealer network. This is why they engrave "Channel Surfing" on all these being sold.

There is a difference between an SCE5-15 PowerTech prop available at any prop shop authorized to resell PowerTech vs the SCE-15-EXT (Channel Surfing Edition) which are only available when ordered direct from PowerTech. The difference between the two versions is mid-range cruising. The stock prop will not perform as well in the mid-range (fuel efficiency, specifically).

I have all the data sheets and such published on our website.

Propeller | LetsGoChannelSurfing

csurf.co csurf.co



IMG_6794.jpeg


IMG_6806.jpeg
 
Edmund said:
Does Ken at PropGods not use PowerTech? I thought that was the brand he was involved with. Then again, my brain.....
Click to expand...

If you've not watched this video, this one is where I disclosed all the prop testing that I've done, it's really in-depth as I go over 5 different prop's, including the Sharrow, factory 3-blade (Yamaha), 4 and 5 blade PowerTech prop's, and a 3 blade Turning Point prop.

 
Martin, should we also be getting the cushion lok from Powertech as well? (I have the R25 Yamaha 250 engine)

POWERTECH CLYX200 CUSHIONLOK DRIVER 150-300 HP YAMAHA (GEN3)​

 
GTilley said:
Martin, should we also be getting the cushion lok from Powertech as well? (I have the R25 Yamaha 250 engine)

POWERTECH CLYX200 CUSHIONLOK DRIVER 150-300 HP YAMAHA (GEN3)​

Click to expand...

The prop comes with it. PowerTech's Cushionlok hub is awesome. Compared to the Yamaha prop hub, the PowerTech Cushionlok is so smooth putting the engine in and out of gear... no more "clunk" when shifting.
 
Submariner said:
If you've not watched this video, this one is where I disclosed all the prop testing that I've done, it's really in-depth as I go over 5 different prop's, including the Sharrow, factory 3-blade (Yamaha), 4 and 5 blade PowerTech prop's, and a 3 blade Turning Point prop.

Click to expand...
I'll watch all of this, thanks.
 
Edmund said:
I'll watch all of this, thanks.
Click to expand...

A lot has changed (for the better) since Dec 2024 when that video was published.

I've got a playlist of Prop Testing videos which came after that you may also find interesting after you watch that first video.

Prop Testing Playlist
youtube.com

Propeller Testing

Testing prop's on our boat
youtube.com youtube.com
 
REVERSING A C?
Sub...fantastic analysis...thanks. Now, for you, or anyone who knows....fuel spend is not a huge factor for us - related to how we use the boat - which is primarily day boating. I mean less fuel is better but we will not recoup ROI if we gauge it on fuel spend. I like tinkering around and improving, and I like to "feel" any changes at the helm. My "feelz" are the pay off for us.

So regarding the 5 blade - the C 24 is a sumbiiich to back up. If current is running side to - even the yammy cranked full to the side and the throttle hammered - the stern will not respond. And TBH, even with no side current, it doesn't back up well at all.

I assume this is because A: the aggressive steps work directly against reverse thrust and B: the fulcrum effect of the prop being so far back with the bracket, etc.

I got a little relief going from 3 blade to 4....and I trim engine up so that less of the thrust is bouncing off the stern....but still not good. .I would like your theories on a 5 blade in this situation.

As well as your predicted impact on mid range acceleration and hole shot. (the 4 blade + SKR have already helped this boat a lot).
 
You must log in or register to reply here.

  • Tugnuts.com is the community hub for Ranger Tug, Cutwater, and Solara owners. Since its inception in 2008, the Tugnuts forum has grown into an active and thriving community of more than 9,000 members. It serves as both a meeting place for the best boating community online, and an invaluable archive of information.

  • User menu
Back
Top