what prop

[bdanley]

i have a 78 ski nautique im looking into getting a 4 blade prop for it since i mainly use it for wakeboarding and tubeing....I have been told it will do better under load....i want some opinions on wether it is worth it to go for a 4 blade or just stay will my regualr 3 blade....I have been doing some research and have had some trouble finding out what size of prop my boat has stock.......Another reason why im looking into a new prop is because last weekend i went to my local mudhole of what used to be called a lake and hit a tree that was submerged didnt do any damage to the glass, the major damage was to my prop so now im faced with ether just fixing this one or getting a new one....im leaning towards getting a new one and fixing my old one just so i have a spare....

[AirTool]

RE: what prop

Fill this out and request a four blade. If you don't have the WOT data just tell him...don't make it up.

http://www.acmemarine.com/contact_us.php

[2gofaster]

RE: what prop

Definitely look at the Acmes. The problem you will run into with your 78 is that the 4 blades will turn a little more rpm than the 3 blades. This would only be noticeable if you're slalom skiing at 34-36, though. Depending on what pitch and cup you use, you could put your engine at those speeds at the point where the 4 barrel opens and closes. Been there done that! lol

[bdanley]

my prop is a braL 13x13 1" im having trouble finding anything on it to even buy a new one i have found 13x13 1"1/8 as a standard size would that even work

[AirTool]

my prop is a braL 13x13 1" im having trouble finding anything on it to even buy a new one i have found 13x13 1"1/8 as a standard size would that even work

Which way does it rotate? LH or RH?

ACME 1" Bore LH Rotation
Part # DIA Pitch Cup BLD Bore ROT
613 12.50 15.25 .105 cup 3 1" LH
913 13.00 10.50 .060 cup 3 1" LH
1225 13.00 10.50 .150 cup 3 1" LH
1229 13.00 11.00 .120 cup 3 1" LH
649 13.00 11.50 .040 cup 3 1" LH
1609 13.00 11.50 .060 cup 3 1" LH
543 13.00 11.50 .080 cup 3 1" LH
541 13.00 12.00 .080 cup 3 1" LH
651 13.00 12.125 .060 cup 4 1" LH
209 13.00 12.50 .080 cup 4 1" LH
475 13.00 12.625 .080 cup 3 1" LH
431 13.00 13.00 .080 cup 3 1" LH
1459 13.00 14.00 .135 cup 3 1" LH
1443 13.25 15.00 .090 cup 3 1" LH
1475 14.50 14.25 .105 cup 4 1" LH

ACME 1" Bore RH Rotation
Part # DIA Pitch Cup BLD Bore ROT
1606 12.50 11.50 .040 cup 3 1" RH
1604 12.50 11.50 .060 cup 3 1" RH
1210 12.50 12.00 .080 cup 3 1" RH
470 12.50 15.00 .105 cup 3 1" RH
654 12.50 15.00 .105 cup 4 1" RH
422 12.50 15.50 .105 cup 4 1" RH
668 12.50 15.50 .150 cup 4 1" RH
648 13.00 11.50 .040cup 3 1" RH
1608 13.00 11.50 .060cup 3 1" RH
542 13.00 11.50 .080 cup 3 1" RH
1598 13.00 14.00 .080 cup 3 1" RH
1458 13.00 14.00 .135 cup 3 1" RH
224 13.00 15.50 .090 cup 4 1" RH
1442 13.25 15.00 .090 cup 3 1" RH
1490 13.25 15.50 .060 cup 4 1" RH
1492 13.50 16.00 .105 cup 4 1" RH
1600 13.50 17.50 .150 cup 4 1" RH
540 13.00 12.00 .080 cup 3 1" RH
650 13.00 12.125 .060 cup 4 1" RH
208 13.00 12.50 .080 cup 4 1" RH
480 13.00 12.50 .105 cup 4 1" RH

[bdanley]

the prop doesnt say anything about rotation but the engine manual sais lh and the max running rpms is 4500

[8122pbrainard]

bd, A RH prop will turn clockwise looking from the rear when moving forward. Unless someone has repowered with a LH, you should have a RH prop. Also a 1" shaft and not the 1&1/8" you mentioned.

AT has list the available 1" props from Acme. You also can go with O.J.'s and Michigan/Ferderal props. You may need to remove the prop as sizes sometimes stamped on the hub end. If I were you, I'd go with the Acme 540.

[81nautique]

The Acme 540 prop is considered by "most" to be the best upgrade you can make to your particular boat . It is a 3 blade, 13x12 and is what I run on my 81SN. It will increase your WOT by approx 400 rpm, the holeshot/pulling power is like adding 40hp, you will be instantly gratified. Lots of bang for the buck, if you want to do a little more homework before buying do a search on CCfan for the 540 and you'll find a lot of info on it.