I need a prop!!! 2000 115hp mercury 2 stroke

199675hpforce

Petty Officer 1st Class
Joined
Feb 27, 2004
Messages
299
The boat is crestliner superhawk 1700 seems pretty heavy. The current prop is 19 black max has a few dings and such. Prop doctor wants $70 to fix it straight. Buying a new one kinda makes sense and i can choose the brand and pitch. Would dropping down to 17 pitch be a good idea im going to be running at 6000 altitude and higher. Havent taken the boat out yet still going through the entire unit getting it ship shape. I dont mind spending hundred to get a prop. Volvo penta ql series or solas amita, solas rubtex. Im even thinking drop it 17prop and going with 4 blade. Give me some ideas so i can get ordering before winter gets here.
 

emckelvy

Commander
Joined
Jan 16, 2004
Messages
2,506
Re: I need a prop!!! 2000 115hp mercury 2 stroke

If your 19p prop is not so damaged that you can't run it, you oughta take it out and see what it does. Real hard to "guess" on prop size without having hard data such as WOT rpm with driver-only and a light load in the boat.

Factor in the loss of a couple-hundred rpm or so with a banged-up prop. You can also have the prop shop re-pitch your prop if you feel the need.

4-blade or 5-bladed prop will be smoother and have superior holding power over a 3-blade, but may be slightly slower in top speed. If you're doing a lot of watersports I'd recommend going that route. A stainless prop, with thinner-than-aluminum blades, will perform even better for any given pitch.

Once you have a baseline of performance with your existing prop you'll be far better equipped to choose its replacement.

HTH.........ed
 

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
Re: I need a prop!!! 2000 115hp mercury 2 stroke

Fore, welcome to Iboats prop forum and we will try to help you as much as we can but without more information no one can help you, and I will tell you I need more information than anyone else. But if you would like my help fill this form out and I will help you as much as I can, if you would prefer to not go to this much trouble there are other people who will gladly help you.

Iboats Boat and Motor Info

1. Year, make and model of boat
2. Length, width and base weight of boat, look for boat decal on back of boat
2a.What is the maximum recommended HP for your boat
3. Number of people and gallons of gas normally on boat
4. What do you use the boat for
5. Is it a Deep Vee and if so how many degrees of deadrise
6. Year, make. manufacturer and model of motor
7. HP and gear ratio of motor IMPORTANT
If you don?t know the ratio, you need to pull the plugs out and put a piece of tape a c ross the prop and the lower unit and then cut it between the prop and the housing and turn the motor until the tape lines up with each other, it is easier if two people do this, so one can watch the prop while the other counts the revolutions of the motor
8. Manufacturer?s recommended Wide Open Throttle (WOT) range
9. Anti-ventilation Plate height above keel of boat if it is an outboard in inches, use a board under the keel and stiking out to the anti ventilation plate for a referene
10. Is it a bass boat or does it have a pad bottom
11. Does it have a hydrafoil, dolefin or trim tabs
12. Make, model, diameter, pitch and whether SS or aluminum prop
13. WOT RPM and speed from your current prop and how much gas and how many people were in the boat for the test data and is the speed by GPS. Make sure you trim the prop up until it starts ventilating and then just trim in until it quits ventilating. If you do not have a tach you can buy a Tiny Tach for $ 50
14. Are you at sea level or a higher elevation, give us the elevation in feet
15. Has your motor been tuned up lately and have you checked that the carburetor butterfly is opening all the way, checked compression, and looked at the plugs and checked spark, all of the foregoing could be the reason your prop is not attaining full RPM
16. How long has this prop been on the boat and why, at this time, do you think it is the wrong prop
17. Does the prop show any damage that you can see
18. What problems are you trying to cure or what are you looking for the boat to do that it is not doing the way you think it should or to your expectations
19. If you are trying to attain a better cruising speed and fuel savings or trying to attain a faster speed I will want you to take your boat and run it with 1 or 2 people and give me the RPM and speed readings starting at 3,000 RPM in 500 RPM increments all the way to WOT.

REMEMBER, The numbers I give you will be NO better than the information you give me

The only thing I ask of you is to come back and give me a report of WOT RPM and speed for my database.


H
 

kick bass

Cadet
Joined
Aug 20, 2009
Messages
26
Re: I need a prop!!! 2000 115hp mercury 2 stroke

Mr. H,
Just came to read some posts. some are pretty interesting. I want to see the answer to this one. But, Remember he said he would be operating above 6000 feet altitude.
Hint:
Horse power loss =
Elevation X 0.03 X rated Horse Power Divided by 1000

6000 X 0.03 X 115/1000= 20.7
HP @ 6000 feet is 115-20.7= 94.3

Don't have a formula for below Sea level Because it usually means your boat sunk!
 
Last edited:

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
Re: I need a prop!!! 2000 115hp mercury 2 stroke

Gary, I use 4% loss. LOL
And that is an exellent formula.


H
 

kick bass

Cadet
Joined
Aug 20, 2009
Messages
26
Re: I need a prop!!! 2000 115hp mercury 2 stroke

Still waiting for your head to expload!
 

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
Re: I need a prop!!! 2000 115hp mercury 2 stroke

:eek: Just kidding about the 4%, trying to mess with your mind. There needs to be more than one mind ready to explode.


H
 

kick bass

Cadet
Joined
Aug 20, 2009
Messages
26
Re: I need a prop!!! 2000 115hp mercury 2 stroke

now you telll me you were kifdding,
I wore out my calculator trying to get 4%! LOL
Thanks,
As soon as he can post more info, He will get his answer.
Sorry, people for the humor, I promise to get serious.
 
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