Prop for Evinrude V4 crossflow

[Maxwell-8]

I have a hard time finding a prop for my 1982 Evinrude V4 90hp crossflow. I am looking for a 23 or 25 pitch prop. Currently running a 21P alloy but I am over 6000rpm at +45mph. Anyone know of a good search? ( on a '70s English 16ft boat)

 

[Chris1956]

Generally, motors of that HP on std boats cannot spin a large pitch prop like what you suggest. That is likely why you are finding them to be hard to find. 21" pitch is usually the max for them.

Are you sure that your tach is accurate? Try Turning point props. They should have at least a 23" pitch prop that will fit.

 

[racerone]

What boat is it on?----What setting on your tachometer?----That motor on a light 16' boat would normally use a 19" pitch.---You are sure it is not a 140 HP powerhead ?----There was a 23" 2 blade bronze prop ( cupped ) available at one time.----A 24" raker was available at one time.-----Might find one on E-bay or at some " collectors " work bench.

 

[jimmbo]

If you are doing 45mph with a 21" Prop, you are turning about 5000
I would check the Setting on the Tachometer
Must be a Very Light, and I mean Very Light, 16ft to get that speed with an 82 90hp
Even Glastron's light little 15 ft, got about 42mph with an 82 90hp

 

[Texasmark]

Generally, motors of that HP on std boats cannot spin a large pitch prop like what you suggest. That is likely why you are finding them to be hard to find. 21" pitch is usually the max for them.

Are you sure that your tach is accurate? Try Turning point props. They should have at least a 23" pitch prop that will fit.

His numbers are good. My avatar is my 90 Merc pushing a 17.5' aluminum bass boat with a stepped hull, not dead rise but 3 distinct steps with the one on which the boat is riding in the picture about 10" wide.....a "pad" of sorts. It had a 24P SS Ballistic running right at 5800 RPM and 50 MPH. You can judge by the wake (er ah lack of) that it's not loafing along.

I think Michigan Wheel bought Ballistic years ago. A place to start looking. I forget where I bought my prop.....may have been right here on iboats....bought half a dozen TP alum. props from them and up in the 23 inch you mention.

 

[Chris1956]

Gee, you are comparing an aluminum hull with 3 steps to a fiberglass hull from the 70's? I doubt his performance is nearly as good as yours's.

 

[Maxwell-8]

Its a Shakespeare 15.6 foot with a ever so small step in the hull, it has no pad.

I have had the chance to borrow a 23pitch prop and the boat went 52 mph (gps) at 5800 rpm. I am in search of such prop or a cleaver
Fuel use at 25mph was also better with that prop.

 

[jimmbo]

It looks more like a 14ft. What's the Boats Beam?

 

[Maxwell-8]

It looks more like a 14ft. What's the Boats Beam?

The haul is 15.6 ft by 6.2 foot wide and I had it weighed with engine at 1800lbs
I may or may not have used a dremel on this engine )

(Srry for the bad english)

 

[jimmbo]

That engine weighs about 300lbs. I find it difficult to believe that a 15 1/2" even with 30 gallons of Gas and a Battery, weighing 1500lbs. You might have waterlogged Foam in it
This 15 1/5 was 950lbs


and this 16ft was 810lbs

 

[Maxwell-8]

Yes, I was shocked as well when they told me the weight.
It was measured without fuel
The foam under the floor? So I should break out the floor?
according to the manual, the haul should be 600lbs.

I do have a heavy wooden bench in the back, a big battery, and a stainless jackplate.

 

[Texasmark]

Gee, you are comparing an aluminum hull with 3 steps to a fiberglass hull from the 70's? I doubt his performance is nearly as good as yours's.

My experience with '70's fiberglass boats on the low tier of cost amounted to a 15' hull with gell coat, one layer of glass mat, sprayed in paint, a wooden deck providing a space for flotation requirements, a fore deck with the same 1 layer of material...a piece of wood attached therein for a dash and a plastic windshield, and a wood transom reinforcement. Hull was basically flat with a slight V in the bow. You could pick up either end by yourself.

 

[Texasmark]

Its a Shakespeare 15.6 foot with a ever so small step in the hull, it has no pad.

I have had the chance to borrow a 23pitch prop and the boat went 52 mph (gps) at 5800 rpm. I am in search of such prop or a cleaver
Fuel use at 25mph was also better with that prop.

I see a "reverse chine". Speaks for itself. like tri-hulls of the 70's, the reverse chine captures high intensity spray from the hull below and reverses its direction giving tremendous lift to the boat and I'll bet it's the reason for his numbers.

My Crestliner 17.5' Fish hawk with a 115 Merc and a 22P Balistic SS prop (with rake and cupping) has a reverse chine also and over 40 MPH the wake starts its exit at the corners of the transom. Doesn't take a rocket scientist to realize that with the onset of the rake that far back, a lot of the hull is out of the water. There is no pad on this boat but a shallow, maybe 10* of dead rise at the transom.