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wats218
01-21-2008, 05:17 PM
I am researching new propellers for my 96 prostar 190. I looked at the transmission nameplate to see if I had a powerslot transmission or not. It stated that the ratio is iA = 1.51 iB = 1.51. Don't know if this means the ratio is 1.51:1 in both forward and reverse (powerslot) or that since they're both the same that its actually a 1:1 ratio. Here is all the info on the nameplate.

Hurth Marine Gear
Model: HSW 450 A2-1.5
Ratio: iA = 1.51 iB = 1.51
Serial: 25 26218 C

Thanks in advance for any info you have.

east tx skier
01-21-2008, 05:20 PM
Sounds like a powerslot, but what size prop is on there now. If it has a 1.125" shaft, it is a powerslot. If the prop on there now is larger than 13" in diameter (see the hub), then unless someone put the wrong prop on there, it's a powerslot tansmission (1.52:1)

wats218
01-21-2008, 05:32 PM
Not sure about the current prop or the shaft diameter. Just ordered a prop puller so I can get the old one off.

east tx skier
01-21-2008, 05:39 PM
If you look at the hub, it will have 3 numbers on it. If it's stock, it'll either be 13x13x1 (1:1) or 14x16.1.125 or 14x18x1.125 (1.52:1)

wats218
01-21-2008, 05:47 PM
It's a four blade so I think that means that the previous owner changed it. I think the stock was a 3 blade. I'm not near the boat right now, but I did look at the hub to try to get the prop dimensions before. IIRC, the only number I could make out was a 14, so if that is accurate I guess it would be a powerslot. I'm not really sure that I trust that the previous owner propped it right though. I did use it this summer with the current prop and you couldn't over rev the engine, but the top speed was only around 35. That could be from the 4-blade, right?

If it is a powerslot what is a good prop. We mainly wakeboard and waterski (regular, you know with two skis). I do want to try to slalom this summer, though (since i do own a slalom boat).

BrianM
01-21-2008, 05:50 PM
Sounds like a slot to me. The stock prop woulf have been a 4 blade with the slot and no 35 mph is not because of the 4 blade. More than likely it is prop damage that is causing that very low top end. Call Eric at OJ or Bill at Acme and ask them what would be best for your application.

east tx skier
01-21-2008, 06:00 PM
35 is way slow. You should top out in the low to mid 40s.

wats218
01-21-2008, 07:13 PM
How accurate is the interpretation of the HIN? According to the FAQ page I have 1:1 transmission. But then again the model of my boat is incorrect also. If I contact mastercraft, can they tell me which transmission I have based on the HIN?

cbryan70
01-21-2008, 07:30 PM
You speedo's could also be off.....

wats218
01-22-2008, 03:11 PM
I know the prop does have some damage. You can feel a little vibration. I'll have to wait until I can get the boat in the water to double check top speed and rpm. The owners manual says it should top off at 43.

wats218
01-22-2008, 03:12 PM
You speedo's could also be off.....

How can you check if the speedo's are off. I never calibrated either of them.

Sodar
01-22-2008, 03:21 PM
How can you check if the speedo's are off. I never calibrated either of them.

Grab a hand held GPS and go for a speed lap!

88 PS190
01-22-2008, 03:22 PM
Handheld GPS
Slalom Course
Set distance marked by bouys or on shore
Or against a calibrated boat.

With the slalom course accelerate to a set speed, say 36 mph on your speedo's. enter course and start timer, stop timer at other side of course. Adjust speedo towards that direction, ie if your time is slow or fast adjust speedo and repeat.

Most speedo's are only accurate where you set them, ie. Get a 36 mph dialed in, 20 mph might be incorrect, but if you do multiple speeds you have two speedo's

GPS is normally easiest for most, get a handheld, and just match the speedo to the gps, remember that gps don't update the speed so rapidly so hold speed when you set it, not on the fly.

wats218
01-22-2008, 04:21 PM
I just got a gps for christmas so that should work perfectly. Thanks guys.

wats218
01-22-2008, 04:22 PM
I talked to jim at BAWS and he said that it is a powerslot. Just bought a prop for it.