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-   -   Switching to a 4 blade prop- (https://www.walleyecentral.com/forums/showthread.php?t=694952)

Daddybigfins 06-07-2019 09:30 PM

Switching to a 4 blade prop-
 
So I'm thinking of trying a 4 blade prop to have a slower planing speed and better boat control in rough water. I never run at WOT, and hate the prop rattle that I can't shake by trying different hubs. I'm running a 2018 1875 Impact Sport, 150 4 stroke with 19p Tempest. My question is should I stay with a 19p if I went with a 4 blade Spitfire or change pitch? Anyone with this boat tried this?

Northwoodswalleye 06-08-2019 12:21 AM

Had identical boat/motor and tried both a 19p bravo LT and a 20p FS. Both worked similar but motor needed to be raised to 4th hole

turtle chain 06-08-2019 06:17 AM

props
 
I do not have your boat
On my triton 206 I am running a 5 blade with great results not sure what pitch you would need? good luck

Opus Dog 06-08-2019 07:29 AM

Give DAH Propellers a call. They will talk to you and answer a lot of questions. I had a prop cupped and done up by them with great results. Joe

WallyWarrior 06-08-2019 09:03 AM

I went down a pitch when switching to 4 blade on a 17ft fisherman. Went with the spitfire and it was the right choice. It was suggested to me on here. Iím very happy with performance increase on the planing and low end torque. I only lost 2mph on the top end.


Sent from my iPhone using Tapatalk

Senderofan 06-08-2019 03:31 PM

If you are thinking of the Mercury Bravo FS........Scott Reichow ( Mercury Racing Prop Guru ) advises going up 1" in pitch from running a Tempest three blade. Just make sure your engine height is appropriate to take advantage of the four blade......IMHO.

Here's a link to the Mercury Bravo FS page.....you'll find a thread there with several guys asking Scott for advice:
[url]https://www.mercuryracing.com/boat-propellers/outboard/bravo-i-fs/[/url]

A YouTube video from Scott explaining the benefits and set up of the Bravo FS prop:
[url]https://www.youtube.com/watch?time_continue=22&v=3P0mUHH6hD0[/url]

MuskieMat 06-08-2019 04:19 PM

Go with a revolution 17p 4 blade, It's amazing went from a 19p tempest. Only down side is lost 4 mph. Cornering and time on plane is much improved. You can turn with out prop blow out I won't change back.

Daddybigfins 06-08-2019 05:56 PM

Thanks for the input folks. I have a spitfire ordered to try next week on a week long trip to Ft. Peck. I'll be able to compare it to the Tempest the same day. If I really like it I'll sell the Tempest next year and pick up a Bravo FS. I want a back up on the boat any way.

riverduck11 06-09-2019 06:28 AM

I also have a different boat, but loved testing props and changing to a 4 blade. It honestly changed my whole boat. I went from a 19 tempest to a 19 Trophy Plus. I got all the advantages you are looking for and I only lost 1 mph on the top end.

Great tip I got on here, when you are trying to dial in your RPM's, start with all solid vent plugs and drill them out yourself. I was amazed at the precision. My motor is max 5800 rpms. I can get it right at 5760 each time I try to max it out again. I have no doubt I could get to 5800 on the number, but did not want to push it or hit the rev limiter.

Diesel Pro 06-10-2019 09:40 AM

[QUOTE=MuskieMat;6329274]Go with a revolution 17p 4 blade, It's amazing went from a 19p tempest. Only down side is lost 4 mph. Cornering and time on plane is much improved. You can turn with out prop blow out I won't change back.[/QUOTE]

This ^^^ exactly my setup.


I had DAH rework my Rev 4 so the gap is closer. The only downside is that both props are at the top of the RPM range and I'd like to raise the motor up so I almost need to go up probably 2 sizes on both theoretically.

2catch1 06-16-2019 07:13 PM

I tried a few on my princecraft deck boat and 150 merc (same as yours). I love my 4 blade turning point propeller. It is aluminum as I run a rocky river all the time. They are cheap and it performs well.

TackleJunky 06-19-2019 10:40 PM

[QUOTE=Daddybigfins;6329148]So I'm thinking of trying a 4 blade prop to have a slower planing speed and better boat control in rough water. I never run at WOT, and hate the prop rattle that I can't shake by trying different hubs. I'm running a 2018 1875 Impact Sport, 150 4 stroke with 19p Tempest. My question is should I stay with a 19p if I went with a 4 blade Spitfire or change pitch? Anyone with this boat tried this?[/QUOTE]

I have a 2025 Impact with 19p Tempest as well. Torque it to 140ft lbs. I think there is old info for like 90?

I have a very small amount of rattle almost not noticeable,

Worth a try if you aren't already at 140 or so.

I have a new 200 Merc.

I'm wanting to try the 4 blade aluminum spitfire just to see how it performs......

Rick

DPKing814 06-20-2019 04:04 AM

[QUOTE=Northwoodswalleye;6329154]Had identical boat/motor and tried both a 19p bravo LT and a 20p FS. Both worked similar but motor needed to be raised to 4th hole[/QUOTE]

Why does the motor need to be raised?

mwh624 06-20-2019 10:15 AM

[QUOTE=DPKing814;6332760]Why does the motor need to be raised?[/QUOTE]

Four blades turn harder (compared to an equivalent 3 blade) but "grip" the water betterl. This allows you to run the motor higher resulting in less motor drag.

You want to run any propeller as high as you can to reduce motor drag, it's just 4 blades are generally able to run higher than a 3 blade.

REW 06-23-2019 03:33 AM

Just be aware that for many folks, they find that they lose reverse performance when switching from a 3 blade to a 4 blade prop.

If you only reverse when docking it will be manageable, but if you do a bunch of back trolling you may find that you will like a 3 or 2 blade prop better than a 3 or 4 blade prop.

Best wishes.

Ches 06-23-2019 08:22 AM

[QUOTE=REW;6333618]Just be aware that for many folks, they find that they lose reverse performance when switching from a 3 blade to a 4 blade prop.

If you only reverse when docking it will be manageable, but if you do a bunch of back trolling you may find that you will like a 3 or 2 blade prop better than a 3 or 4 blade prop.

Best wishes.[/QUOTE]

Now REW, When was the last time you saw a fishing boat with a 2 blade prop on anything but an electric trolling motor?
Ches.

Lmbkiller 06-23-2019 10:31 AM

I have a 7.5 and 4.5 both mercs both have 2 blade props both power small aluminum fishing boats that catch plenty of fish

Daddybigfins 06-23-2019 11:23 AM

Thanks for the replies. My experience with the 4 blade spitfire is that the all around performance isn't as good as the Tempest but I can see using it for hauling the ridiculously heavy loads that I carry when going out for a weeks camping trip with 2-3 guys.
The hole shot is better but the Tempest isn't bad until you put a huge amount of weight in the boat. I could run about 1.5 mph slower and still stay on plane, which is an improvement but isn't enough of a difference in my mind to justify a switch. I couldn't trim out as far with the spitfire and still stay hooked up which surprised me after what I had read here(motor is in the third hole). The top speed/rpm difference just doesn't matter to me but I lost 1.5 mph at 4000 rpm. The motor would make a whining noise if I backed off of the throttle too fast while decelerating with the spitfire, not sure what would cause that. There was no prop rattle with the spitfire though, that was nice. I'll probably run both props thru the summer to get a better feel for the differences but as of now I think I like the performance of the Tempest better.


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