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28 Regulator prop selection, stern lift

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28 Regulator prop selection, stern lift

Old 07-13-2019, 06:12 PM
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Default 28 Regulator prop selection, stern lift

I used to run a 26 Reg with twin F300s. All of these boats like stern lift. That boat ran great with Rev 4s with 200 HPDIs but terrible with Rev 4s with the 300s. Today with the 28 with 21P SWS2 props with full fuel could only reach 5600 RPMs trimmed to 8 bars and we need more stern lift. I was thinking Eco Enertias in 18P, Rev 4s in 20P, or OFS4s in 19P. Any thoughts?
Old 07-13-2019, 06:23 PM
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Hydrofoils will get the job done. A lot cheaper than testing and finding the optimum propellers.

Some will come along and state that hydrofoils are not worth a damn. But finding and using a propeller that might do the same thing is a wonderful thing.

There are also trim tabs as a solution.

If the boat is in need of stern lift is it possible that the Cg needs to be moved forward?
Old 07-13-2019, 06:46 PM
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Originally Posted by alloyboy View Post
Hydrofoils will get the job done. A lot cheaper than testing and finding the optimum propellers.

Some will come along and state that hydrofoils are not worth a damn. But finding and using a propeller that might do the same thing is a wonderful thing.

There are also trim tabs as a solution.

If the boat is in need of stern lift is it possible that the Cg needs to be moved forward?
The COG is fine. Every Regulator I have run is ass heavy. Just want to get the bow down at 3000-3800 RPM without having to use trim tabs (which work very well but burn a lot of fuel). The boat needs to come out of the hole faster. I have used hydrofoils on small flats boats with 50-90 HP engines and they can truly work wonders despite how ugly they are. However, I dont want to put them on a twin engine CC
Old 07-19-2019, 10:16 AM
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Hello Ninetoes

The Revolution 4 is an overall lifter. It will give you stern lift out of the hole and accommodate some bow lift once on plane due to the blade geometry and rake present on the propeller.
Based on the current rpm, you should try a set of 19 pitch. This will get you to the rated rpm, and therefore achieve the full hp of the engine.
Please call us for a quote and more details or any other questions.
PS: Wouldn't use hydrofoils in this application. Hydrofoils tend to lift the stern a lot, but in different conditions (weather changes, different loads etc..) you would have less control on the bow (if bow lift is required at a certain moment).

Always a pleasure!
Old 07-19-2019, 10:38 AM
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If your local, you can try some 4 blades I have. I am running ofx4 19s on a ass heavy hydrasport 30 with yams 300. Also will be trying a set I have in my garage of LFS4 17s.

Old 07-19-2019, 12:21 PM
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I think I have your old ofs 4 19 s if you want to try them. I also have a pair of rev 4 20 I currently run you could try as well.
Old 07-19-2019, 12:36 PM
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Originally Posted by GeneralPropeller View Post
Hello Ninetoes

Hydrofoils tend to lift the stern a lot, but in different conditions (weather changes, different loads etc..) you would have less control on the bow (if bow lift is required at a certain moment).
Can you elaborate here? Do you have experience not being able to lift the bow after the addition of foils?

Old 07-19-2019, 02:23 PM
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Rev 4's have them labbed to add some cup
Old 07-19-2019, 02:32 PM
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Bravo 1 4 blade

we SC freaks have tried em all.
We know stern lift!
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Old 07-19-2019, 02:37 PM
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very typical for the regs as I had a 26 w f250s . raised them i knotch and went to the rev 4 s per my conversation with prop god and filled up forward fuel tank . wasn't perfect but certainly helped . sold the boat and went to a 28 southport . the reg is a great boat you just have to get it balanced out and use some tab . no one ever said they were efficient but ride is nice.
Old 07-19-2019, 03:34 PM
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Call Ken at Prop Gods. I know there are other folks that may be just as knowledgeable, but, I have delt with him and don't know the other guys. He returns calls quickly, is familiar with most hulls and props and will let you test and return props till you get what you like.
Old 07-20-2019, 06:45 PM
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I bought Rev 4 19Ps from Ken. He was a great help as always.
Old 07-21-2019, 06:55 AM
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Subd Exact same with my 28 Reg. Considering 19p Rev4s as well. Havent had time to do it yet.
Old 08-02-2019, 05:16 PM
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Big thanks to Ken at Prop Gods. Today I put Rev4 19p on the 28 Reg (actually quicksilver Q4 19p, same as a Rev4). The difference is AMAZING. I was motivated to make the change from SWS2 props for a few reasons:
1) could only get 5600 rpm trimmed to 8-9 bars
2) the stern was buried with a fulll fuel load for fishing. Planing out took forever and the biggest issue...
3) with anything more than 50% fuel, the boat would require tab to keep the bow down. I was super frustrated porpoising over 1-2’ swells an the way out fishing but then having a great ride back in once I burnt off the fuel weight and emptied the livewell.

I ran the Rev4s for about 20 minutes in the bay. First thing I noticed is the faster hole shot and stern lift. At 3500 rpm and engines all the way down, it was like using 50-70% bow down trim tabs with the SWS2s. I’d usually cruise out with my motors fully down and 30% tab with a full load. The Rev4s like 3-4 bars of engine trim and no tab for a similar attitude. This means I have a lot more engine control on trim before I ever touch my tabs. Boat ran WOT 6000 rpm at 57mph and 9 bars of trim.

inalso noticed the motors sound happier and quieter throughout the rpm range. They used to kind of howl at 4500 rpm and up but would be quiet from 4000-4200. Now just quiet.

Massive success.

Sadly I had to go back to my SWS2 props after my 20 minute test because I noticed a gear oil smell around one prop shaft when i pulled the factory prop initially. Don’t want anyone blaming the new props for a bad seal. I’ll get that serviced next week and then it’s Rev4s for the win.

This was all with the motors in the lowest hole as I don’t want more than one change at a time.

Last edited by spearfish25; 08-04-2019 at 01:38 PM.
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Old 08-02-2019, 05:21 PM
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Originally Posted by spearfish25 View Post
Ok so today I put Rev4 19p on the 28 Reg (actually quicksilver Q4 19p, same as a Rev4). The difference is AMAZING. I was motivated to make the change from SWS2 props for a few reasons:
1) could only get 5600 rpm trimmed to 8-9 bars
2) the stern was buried with a fulll fuel load for fishing. Planing out took forever and the biggest issue...
3) with anything more than 50% fuel, the boat would require tab to keep the bow down. I was super frustrated porpoising over 1-2 swells an the way out fishing but then having a great ride back in once I burnt off the fuel weight and emptied the livewell.

I ran the Rev4s for about 20 minutes in the bay. First thing I noticed is the faster hole shot and stern lift. At 3500 rpm and engines all the way down, it was like using 50-70% bow down trim tabs with the SWS2s. Id usually cruise out with my motors fully down and 30% tab with a full load. The Rev4s like 3-4 bars of engine trim and no tab for a similar attitude. This means I have a lot more engine control on trim before I ever touch my tabs. Boat ran WOT 6000 rpm at 57mph and 9 bars of trim.

Massive success.

Sadly I had to go back to my SWS2 props after my 20 minute test because I noticed a gear oil smell around one prop shaft. Dont want anyone blaming the new props for a bad seal. Ill get that serviced next week and then its Rev4s for the win.

This is was all with the motors in the lowest hole as I dont want more than one change at a time.
what motors and year motors? Sorry if you posted the info earlier in the thread.
Old 08-02-2019, 05:31 PM
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Originally Posted by NickTF View Post


what motors and year motors? Sorry if you posted the info earlier in the thread.
sorry, 2018 Yamaha F300s.
Old 08-02-2019, 05:33 PM
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Originally Posted by NickTF View Post


what motors and year motors? Sorry if you posted the info earlier in the thread.
was under the impression this issue was only with older 4.2s. Im in the market for this prop with my single f300 4.2 so will be interested to see if this is legit or placebo (I know my mind can play tricks on me....). Thanks!
Old 08-02-2019, 05:39 PM
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Originally Posted by NickTF View Post

was under the impression this issue was only with older 4.2s. Im in the market for this prop with my single f300 4.2 so will be interested to see if this is legit or placebo (I know my mind can play tricks on me....). Thanks!
Ill post back once my dealer looks it over next week. Super annoying if theres truly a leak running factory Yamaha props for 96hrs.
Old 08-02-2019, 07:27 PM
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I had the exact same experience with Rev 4 19s. We are running with the engines on lowest mounting holes. With full load of fuel (265 or so gallons) we hit 55 MPH at 6000RPMs. The boat has bottom paint as well. The mid range performance is unbelievably better than the SWSIIs. The hole shot is awesome. We went from needing a ton of tabs to now the boat takes off with no tabs, bow runs about 6" lower. I was going to raise the engines a hole or two but they seem right where they are.

Thank you Ken from Prop Gods for setting this boat up right!! He was dead on with his suggestions.
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Old 08-03-2019, 06:58 PM
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So has anyone raised the motors 1 hole on their 28? That's my next consideration. Boat goes in for service next week, so now could be the time.

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