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View Full Version : Prop for more top speed? PS 190 1995.


Surfer
05-25-2011, 05:34 AM
Hi,

I have a ProStar 190 1995, 275 hp engine, with 1:1 transmission, 4-blade prop 13 x 13.
Top speed being now 38 mph (or knots), i.e. 70 km/h.

Any suggestion for a prop to change to gain more top speed e.g. for barefooting, with less revs and less fuel consumption?
I researched this a few year ago, and it seemed that only possibility was to gain max 3 mph.
If more top speed, then acceleration would suffer.

Any experience or comments, prop recommendations?

:)

CantRepeat
05-25-2011, 07:22 AM
38 doesn't seem right at all. I would think with correct factory prop you should get at least 42 mph out of it.

Eric from OJ is on this site. If he doesn't find this thead you can send him a private message EJ OJPROP.

EJ OJPROP
05-25-2011, 07:38 AM
What is the RPM at 38 MPH? Has the prop been repaired? What is the elevation you run the boat?

BrianM
05-25-2011, 02:20 PM
38 is slow. I bet your props been repaired and not quite right. Mine runs 44 mph with the 13x11.5 3 blade on XMP

TxsRiverRat
05-25-2011, 02:26 PM
MasterCrate rates that boat at a top speed of 43 or so.

DooSPX
05-25-2011, 02:29 PM
I agree... 38 does seem low... what is the RPM?

DooSPX
05-25-2011, 02:40 PM
Also, after you find out your rpm's... call Eric from OJ and talk to him about your needs... He is the BEST to work with and will get you a prop that you will be happy with.

setidball
05-25-2011, 04:24 PM
Same boat, same motor, same trani, 3-blade (13x13) ... 44mph. Don't remember the rpm's ... 4500 I think. S

Table Rocker
05-25-2011, 05:00 PM
38 knots or 70 km/h is 43.5 mph. He is getting the same out of that prop as everybody else.

That is if his speedo is in knots or km/h.

BrianM
05-25-2011, 07:32 PM
If you are getting 43.5 mph that is going to be about it with that boat.

Surfer
05-27-2011, 06:00 AM
What is the RPM at 38 MPH? Has the prop been repaired? What is the elevation you run the boat?

Sorry, my mistake, I mixed knots, land miles, and nautical miles. :)

The boat goes now 43,5 mph (37,8 knots, 70 km/h).
RPM I do not remember, in two weeks I will check that!
If I remember right it is around 4000, 4200 maybe.

What do you mean by elevation?

Surfer
05-27-2011, 06:06 AM
If you are getting 43.5 mph that is going to be about it with that boat.

38 knots or 70 km/h is 43.5 mph. He is getting the same out of that prop as everybody else.

That is if his speedo is in knots or km/h.

Yes, my speedo is in km/h, as in Europe!
But, BrianM, are you saying that prop change would not increase the top speed?
Ok, I understand, that with this configuration no.

But the question remains. Maybe a prop with 15 or 17 inch pitch, enough acceleration, enough torque for WOT RPM, in that case?

BrianM
05-27-2011, 11:31 AM
You might be able to eek out another 1mph or so but not much more than that. No way you can run a 15 or 17 pitch prop with a 1:1 just not enough torque to spin that prop. Out of the hole performance would be non existent and you would probably lose top end because the motor wouldnt be able to spin top rpm. That boat, motor and trans combo is only good for right around 44 mph.

DooSPX
05-28-2011, 11:41 AM
I would agree with Brian... But, Call or PM Eric from OJ and ask him.
He makes the props for MC and several others...

JLeuck64
05-28-2011, 01:21 PM
What top speed are you trying to reach? These hulls aren't designed to go into the low 50's like some of the other brands that are barefoot specific. Keep this in mind when shopping for a new prop...
in my case I found it easier (and less expensive) to lose weight! Every 10 lbs you drop will make a difference. Also think about getting a pair of shoe skis, You can simulate a LOT of footing with them at lower speeds. They provide a great workout at slower speeds which consumes less fuel ( ;