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06-23-2019 12:23 PM
Daddybigfins 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.
06-23-2019 11:31 AM
Lmbkiller 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
06-23-2019 09:22 AM
Ches
Quote:
Originally Posted by REW View Post
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.
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.
06-23-2019 04:33 AM
REW 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.
06-20-2019 11:15 AM
mwh624
Quote:
Originally Posted by DPKing814 View Post
Why does the motor need to be raised?
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.
06-20-2019 05:04 AM
DPKing814
Quote:
Originally Posted by Northwoodswalleye View Post
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
Why does the motor need to be raised?
06-19-2019 11:40 PM
TackleJunky
Quote:
Originally Posted by Daddybigfins View Post
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?
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
06-16-2019 08:13 PM
2catch1 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.
06-10-2019 10:40 AM
Diesel Pro
Quote:
Originally Posted by MuskieMat View Post
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.
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.
06-09-2019 07:28 AM
riverduck11 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.
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