View Full Version : 1987 w/powerslot prop

05-09-2005, 05:06 PM
Bought this boat this winter and it had a 14x18 3 blade on it. Everybody told me it was the wrong prop! I put a 13x13 3 blade on and it is DEFINITELY not right (5500 rpm and 32 mph plus the valves were floating!!!!). What prop would be a good starting point? We are a mile high in altitude and are using the boat mainly for skiing and boarding with teenage boys.

east tx skier
05-09-2005, 05:13 PM
Welcome to the board. If it's a slot, 14x18 sounds right, but I don't know for sure. As you mentioned, it's definitely not 13x13 as would be correct if it was a 1:1. Brad should have an answer for you if no one else does. He's got an 87 slot.

east tx skier
05-09-2005, 05:56 PM
Okay, 14x18 is right. Here's another thread.

Powerslot Prop (http://www.tmcowners.com/teamtalk/showthread.php?t=1959&highlight=14x18)

05-09-2005, 06:00 PM
If you are up close to 6,000 feet you might have to go down in pitch from the stock 14x18 for performance reasons because of the power robbing effects of the altitude. Ask around the local ski boat dealer to see what they say people are running or call ACME propellers or OJ to get their recommendation. But if you still have the 14x18, I'd put it back on and see how it performs. That will give you much more info to tell the dealers if it doesn't seem right. I think you ought to do about 42 at about 4.5k rpms in that boat. Hole shot should be good. You might have to sacrifice some top end for hole shot at that altitude though. At Tahoe (6,000') my folks had to prop down their I/O quite a bit to get out of the hole. Cost about 5mph at the top end.

05-10-2005, 08:14 AM
I would suggest our 13.7 X 15.5 LC 1 1/8" 4-blade for your application. The standard propeller would be the 14 X 18. At the altitude you are running the 15.5 will allow the motor to run the proper RPM. If you have any other questions please let me know.

Eric Johnson
Johnson Propeller

east tx skier
05-10-2005, 11:27 AM
Ah, altitude. Forgot to look at that.

Eric, don't know if you read the other post, but we got rained out on Sunday, so the prop test was postponed yet again.