Which prop to use on 85hp evinrude?

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pokerface

Cadet
Joined
Jun 14, 2009
Messages
25
I have a 18 foot Maxum ski boat with a 1973 85hp Evinrude. Looking to get more of a hole shot. What pitch would be best? 3 or 4 blade? Thanks
 
countvlad

countvlad

Chief Petty Officer
Joined
Jun 29, 2009
Messages
439
Re: Which prop to use on 85hp evinrude?

pokerface said:
Anyone know?
Click to expand...

from what ive read a 4 blade will get you on the plane faster but your speed would drop.... if you have 19 pitch now and you switch to a 4 blade you wanna go 1 pitch lower.... thats tone of info out there on props do a search...

answering your question: which prop to use on 85hp evinrude? well nobody can answer you that question... as ive learned the hard way choosing a perfect prop setup is ofter archived throught trial and error

also if you have an aluminum prop right now you might wanna get a SS prop because it flexes less

if i were you i would stay with a 3 blade

what are your RPMS at WOT???
 
hwsiii

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
Re: Which prop to use on 85hp evinrude?

Poker,welcome to Iboats prop forum and we will try to help you as much as we can, but there is certain information that is needed in order to help you. The following form has all of the information that is needed to help you with your problems in finding the right prop. If you do not know all of the information that is asked for on the form please give us the most information you have available as I have a program I designed to find the right prop for any planing hull boat that needs this information, and most other people who are trying to help you will need the same information. It requires time to find all this information when we have to look for it and in my defense I expect you to be willing to expend as much effort in finding the right prop as I do. We hope to be able to help you get the exact prop you need for your particular uses, and this information is required to do that.
It is not as simple to pick the right prop as most people coming to this forum think it is, that is why we ask so many questions, it is for your benefit we ask all these questions. And if you have a stainless steel prop or are changing to one the blade geometry of the prop can make a lot of difference in speed and RPM.

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
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
8. Manufacturer?s recommended 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 or trim tabs
12. Make, model, diameter, pitch and whether SS or aluminum prop
13. WOT RPM and speed from prop, how much gas and how many people in boat for test data

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
 
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