prop wizard 2.0

[jeffbort1]

i got a used 88 proline 16' center console with a 87 mariner 75hp 4cyl. the lower unit was cracked bad. i found a used mercury lower unit (dont know year). i now need a prop and dont know where to start. did anybody have any success with the prop wzard 2.0 like you find on ... http://boatmartusa.com/marinemall/propPage.php

i have seen a few more sites that use this system... its telling me i should run a 13 1/4 x 21 or 23 for top speed.. i just dont see that size in anything other then the hustler props these websites sell

 

[rndn]

Re: prop wizard 2.0

The various prop calculators are fairly accurate. I did use one for my boat and have been very pleased with the performance. There is also one here http://www.turningpointpropellers.com/, maybe you can check to see if the sites are all suggesting the same size.

 

[jeffbort1]

Re: prop wizard 2.0

thanks rdnd that website uses the same prop wizard 2.0 calculator it seems all theses sites use the same calculator and they all sell the same props. a shop wants to know if my lower unit was made in the us or japan.. but it is used and i know nothing about it.. that would tell them what diamater the prop the lower unit came with. which would be a mercury oem prop. i see you had luck with the calculator i will giove it a try

 

[hwsiii]

Re: prop wizard 2.0

Jeff, 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 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 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 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 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
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. 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

 

[Bifflefan]

Re: prop wizard 2.0

here's my 2 cents, and thats about all it worth.

measure from the shaft to the ventalation plate. minus 1/2" then multiply by 2. this is the max dia. prop. count the splines, enought said there. measure the hole dia. at the rear of the lower unit (where the back of the prop sits).
this with the manufacture and HP should be enough to get the correct prop.
pitch will be a different story.
its not nessarry to with the max dia. eather.