prop reccomendations?

[pmat1]

I think its time for a new prop, my current one is pretty beat (previous owner), my gas consumption and rpms are horrid.
1) Performance issue you are trying to correct.
extreme gas consumption and high rpm;s
2) Current prop manufacturer, model, aluminum or stainless and as a minimum.
some 15+ year old aluminum prop
3) Current prop diameter and pitch (required).
13 1/2 dia and 15 putch
4) Wide open throttle RPM and speed with an average load (very helpful)
Around 6 grand.
5) Engine/drive make, model, year, and HP
1985 evinrude e70elco 70hp
6) Boat make model, year, length and weight
1986 Thundercraft. 16'2 Dont know the model but i do beleive it is a regency o/b. no idea about weight.

i will be buying the prop off iboats.

Here is a quick vid of holeshot if it helps any..
http://img190.imageshack.us/i/mov00835.mp4/

 

[steelespike]

Re: prop reccomendations?

Looks like a brisk hole shot.I think a Turning point hustler in the same pitch will help you out.Generally they give overall improvement when changed pitch for pitch.

 

[Bifflefan]

Re: prop reccomendations?

I have basicll the same boat, older tho.
I use a 14x17 Alum 3 blade for pulling the tube and a 13x19 SS 3 blade for anything else.
Gets good fuel economy with the 19 and not so bad with the 17 eather.
My 17 has a lot of cupping and it really puls out hard.
The 19 is just good all around for everything else.

 

[pmat1]

Re: prop reccomendations?

i also use a different prop for tubing, its what i beleive is a 12 pitch. even on a tube its still slow and revs high, but it dosent lug the motor like the 15. Im sure a new prop would help, even if in the same pitch, this one looks like it scrapped something, and was grinded. Should i try a 16 or 17 pitch for the heck of it? or would it be a possible waste of money?

 

[junior1113]

Re: prop reccomendations?

where is cavitation plate in relation to bottom of transom?
do you have a whale tale.
if motor has room to go up a 17 would be worth a shot.
if hole shot and fuel are all you want a 4 blade prop is the answer.
all i run is 4,s

 

[pmat1]

Re: prop reccomendations?

I would like high top speed and gas savings. Holeshot dosent really matter to me... The cavitation plate is not much lower then the bottom of the boat if i remember correctly, i would check if it wasnt in the water. I am not exactly sure what you mean by whale tale, here is a pic of wot.

 

[pmat1]

Re: prop reccomendations?

http://boatpropellers.iboats.com/Ev...andard&**********=363992537&*******=322173857

i like the turning point hustler... it is probabily the cheapest prop for my motor and steelspike recommended it.

 

[pmat1]

Re: prop reccomendations?

Nobody can tell me if it is worth buying or not? Its not impossible to tell me if a 2 inch increase in pitch will give me any noticible performance or not. Just my .2 cents.

 

[hwsiii]

Re: prop reccomendations?

Pmat, if you will fill this out I will see what I an do to help.

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 across the prop and the lower unit and then cut it between the prop and the housing then do the same thing on the motor and turn the motor until the tape lines up with each other on the prop, 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
RPM ___________ Speed ___________ No. of people ____________ Gas ________
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

 

[stylesabu]

Re: prop reccomendations?

whale tail is a hydro foil, or a bolt on extension of your anti cavitation plate