tough to plane, repair prop?

Geodopolis

Cadet
Joined
Apr 28, 2009
Messages
16
I have a '68 johnson 65h v-4 on a 17.5 ft fiberglass alumacraft(deep and wide). I have no tach or speedo, but gps says max is 23 mph. I just got it purring this spring but I can't seem to get on plane with more than two people in the boat. The prop is kinda worn and one of the blade tips is bent forward (about an inch of the tip). How big of a problem is this, would a different pitch help, or is it a trim adjustment issue? Thanx for the help.
 

cr2k

Captain
Joined
Mar 19, 2009
Messages
3,730
Re: tough to plane, repair prop?

First start with a new or rebuilt prop or have yours fixed.

Bent blades are a big drag (pun intended).

There are 2 basic balances on a prop, static (no heavy blades) and dynamic which includes ALL blades pulling equally in the water.

If one blade is bent it will mess with the water flow over the others and cause poor performance.
 
Last edited:

hwsiii

Commander
Joined
Jan 25, 2009
Messages
2,639
Re: tough to plane, repair prop?

Geodopolis, 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 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 planning hull boat that needs this information, and anyone else who is 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
8. Manufacturer?s recommended WOT range
9. Antiventilation Plate height above keel of boat if it is an outboard in inches
10. Make, model, diameter, pitch and whether SS or aluminum prop
11. WOT RPM and speed from each prop

H
 
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