Merc 250 4s 5800 rpm

[bhodgedds]

Ran a fury 3 23p today. Varied jp from 3” to 1 1/2. Highest rpms were 5920.smartcraft. Speed 70-71. Lower motor lower rpms
So what are your thoughts?

[mikesxpress]

Box prop?
Trued up 23 (without any other BS) will get you your 6200.

[bhodgedds]

Croxton?

[DaveTTN]

With the new gear cases prop slip at 10% or less is quite common.

[bhodgedds]

Yesterday I ran 70 at 5910 rpms. Air temp 34. Water temp 52. That’s with a fury 3 23.
So do I need a 22p prop?
If I were able to get a bravo l fs they say go up 2”. So I should go up 1”?

[EuropeanAM]

2004 tr21x with a 250fourstroke running a 24 fury 3 blade at 6100. 77mph with two guys and gear. In the summer heat.

Mercury prop slip calculator using your data and 1.75 gearing shows a 3% slip. That is not achievable. Most bass boat setups are in the 10-20% slip range. A high performance drag boat with $5K propellers occasionally reach 8% slip.
Your speed or RPM data is suspect. You will want to check the devices for accuracy.

That's actually right at 5% slip, since the Fury he's running is probably right at 24.6 pitch (Fury is usually on the high side of it's pitch number). And that's certainly possible with the TM gearcases... see it quite regularly.

That being said- this isn't the Original Poster's engine or setup, so it's not a lot of help.

Yesterday I ran 70 at 5910 rpms. Air temp 34. Water temp 52. That’s with a fury 3 23.
So do I need a 22p prop?
If I were able to get a bravo l fs they say go up 2”. So I should go up 1”?

22P in the Fury, 24P in a Bravo-1 FS.

[bhodgedds]

Thanks Don

[eatmywake]

John I don't need a ride. You provided the data. I just put it thru the Mercury prop slip calculator that's been in use for many years and it doesn't make sense.

What number did you use for pitch? I’m guessing, 24 but you should be using 25 since it’s a Fury.

He’s actually at 7% slip which is really good and certainly not out of the question.

[nowakezone]

I've seen around 5-7% slip on a 250 pro xs 4 stroke, these new lower units are very efficient.

[Jasonrs]

Same here, in the 5-6% range pretty consistently with my setup. Wasn t sure at first, every other mercury outboard ive run is closer to 10-12%

[fishnfireman]

Same here, in the 5-6% range pretty consistently with my setup. Wasn t sure at first, every other mercury outboard ive run is closer to 10-12%

not a problem if you have an efficient hull.

[leonreno]

Delete

[EuropeanAM]

What number did you use for pitch? I’m guessing, 24 but you should be using 25 since it’s a Fury.

He’s actually at 7% slip which is really good and certainly not out of the question.

24.6 is pretty close for the Fury.

[bhodgedds]

Today I ran bravo 1 fs 24 and hit 6000 for the first time at 68.5 max speed. 2 ppl 250 lbs gas at 1/4 tank and live wells empty

[Pulsare2020]

Today I ran bravo 1 fs 24 and hit 6000 for the first time at 68.5 max speed. 2 ppl 250 lbs gas at 1/4 tank and live wells empty

Did you try and raise the engine higher with the Bravo FS to gain a bit more rpm or is 6000 the maximum for the engine?

[bhodgedds]

I did bump it up and rpms began to drop.

[bhodgedds]

6200 is engine max. 6000 is closest I have been. And in cold air. I have tried so many props and I think I’m done. Just gonna go with what I have. Not racing anyone..I just wanted it to be performing as it should. I just wanna drive it and go fishing. I never dreamed trading boats would be such a hassle.

[Pulsare2020]

I did bump it up and rpms began to drop.

I think you meant to say the speed dropped when you raised the jack plate higher, not the rpm or am I confused. Glad you got it figured out. I have been there and constantly trying different expensive props, gets old fast.

[smokeyboy]

i have a Nitro z20 with 250 4s.duel 10 ft power poles,4 batteries and normal tournament gear and witha 24 3 fury i turn 5800 and run 71-72,with a 23p 3 fury i run the same speed and 6100 rpm and use alot more gas. i don't see the need in a 23p. my 24p does great out of the hole.

[bhodgedds]

No. Actually the rpms dropped. I was watching that guage as I was trying to see how high they would go.