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  #1  
Old 09-15-2018, 01:59 PM
Cobbled Cobbled is offline
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Default Bought boat. Needs a prop

Hi. I got a great deal on my first steering wheel boat other day! Its a 2003 crestliner 1750 sport fish, the motor is a Ole smoky merc 125 (prolly 03 aswell but not sure) 2+2. I'm wondering what pitch and size I should go with and what my wide open rpm should be. I will mostly use it to fish but might pull a tube or skier on the side. I have not even taking this boat on the water myself yet.

What prop for fishing only?
What prop for tubing/ski only?
Any good hybrid props? Or is the tube ski prop the hybrid

Also I want to go stainless. I seen merc had this insert that is supposed to break incase of a rock strike, how do i get that?
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  #2  
Old 09-15-2018, 03:33 PM
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Farmerj Farmerj is offline
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5000-6000 rpm.

I'd suggest starting with a spitfire 17" for fishin' and maybe a 15" for tubing.

The hub kit came with both of my props
Here's what I have.
https://www.walleyecentral.com/forum...d.php?t=684968
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  #3  
Old 09-15-2018, 04:49 PM
Cobbled Cobbled is offline
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So would pulling a tube with a 19inch prop cause to much stress on the motor? How long does it take to swap props anyway? What speed difference would there be from the 17 to 19? It seems like getting a 17 would be a better idea since swapping props seems like a buzz kill.
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  #4  
Old 09-15-2018, 05:24 PM
REW REW is online now
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Cobbled,
With that boat and that motor, it is doubtful that you would be able to turn the 19 pitch to rated rpm.


Therefore the 17 pitch prop for general purpose use and the 15 pitch prop for heavy load pulling like tubes, skiers and other big loads.

If the boat is on the trailer, it takes about 2 minutes to change a prop. One minute to take it off and one minute to put the other one back on.

Get a socket breaker bar and the correct size deep socket for your particular prop nut.

Also, it is a good idea to carry a spare prop nut, prop washer, backing plate and locking tab or cotter pin - which ever is used for your motor.

A box like this one makes a perfect tool box. It has a rubber gasket with a snap down latch and is 100% waterproof. Carry a few tools spare prop nut, and washers, spark plugs, tape, pliers, crescent wrench, spark plug socket - and a box of band aids.

Also, check to see that your fire extinguisher is fully charged and is not out of date. If it is not charged or if it is out of date - replace it.

Also, have a paddle on the boat as well as an extensible push pole to help around a dock or near a tree or brush on a shore line.

Carry two or three ropes to use as lead ropes, anchor ropes or whatever.

Good luck

Last edited by REW; 09-15-2018 at 05:28 PM.
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  #5  
Old 09-15-2018, 07:39 PM
Cobbled Cobbled is offline
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Oops I meant to say 15 and 17. Thanks for the advice. What mph difference is there between 15 and 17? Is going stainless worth it?
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  #6  
Old 09-15-2018, 07:57 PM
REW REW is online now
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It is always worth it to get a stainless prop if you want much better durability and the ability to shed low speed bottom strikes with essentially 0 damage.

In this HP range, you typically will not get much difference in the area of performance.


So, dial in the prop that you want to use for your boat doing different things. Then, if you are very happy with the selection, go pick up essentially the same prop in stainless and you will have a very long lived prop - as long as you don't do a wide open, full bottom strike on a rock or rock pile.

The 15 pitch prop will likely be a 35 mph prop.

The 17 pitch prop will likely be a 37 mph prop.

A 19 pitch prop will likely be a 36 mph prop with a poor hole shot.

Good luck
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Old 09-15-2018, 08:05 PM
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For me, the 15" was a 38-39 mph prop. But it popped put of the water like nothing.

The 17" is a 43.44 mph prop. Still has a good hole shot, but you can tell it's not like the 15".
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Old 09-15-2018, 08:23 PM
Boondock Boondock is offline
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Lot of miss information posted

Max rpm for that motor is 5250.
So a 19 pitch near sea level might over rev.... would consider a 20-21 if it does

17-19 would be good for tubes/skiing

Stainless is super worth it once dialed in. Can trim up without blow out and helps a ton in big waves also from keeping the prop blowing out.
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Last edited by Boondock; 09-15-2018 at 08:25 PM.
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  #9  
Old 09-15-2018, 08:38 PM
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My mistake. 5000-5750 rpm.

Let me know if you can actually get it to turn a 19" prop faster than 5200 rpm.


Today was a polite reminder for my cousin why Stainless is a bad idea for a prop.

As he sits there looking at a 115 Suzuki with a tore up lower unit and a damaged sst prop from hitting a submerged log on the lake. No, the hub didn't shear like it's supposed to. But he's not got to replace a $700 prop plus rebuild/replace the lower unit if it cracked the case.
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Last edited by Farmerj; 09-15-2018 at 08:43 PM.
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  #10  
Old 09-15-2018, 09:06 PM
Boondock Boondock is offline
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Quote:
Originally Posted by Farmerj View Post
My mistake. 5000-5750 rpm.

Let me know if you can actually get it to turn a 19" prop faster than 5200 rpm.


Today was a polite reminder for my cousin why Stainless is a bad idea for a prop.

As he sits there looking at a 115 Suzuki with a tore up lower unit and a damaged sst prop from hitting a submerged log on the lake. No, the hub didn't shear like it's supposed to. But he's not got to replace a $700 prop plus rebuild/replace the lower unit if it cracked the case.

Wrong on his motor
No 115 pro xs in 2003
Sure if you have a great chance of hitting something ss might not be worth it. But itís a GIANT difference performance wise like it or not. 90hp or more I would say

2+2 motor is 5250 max rpm and it has a ton of bottom end to get on plane. Way more than my 4 stroke
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