Acme prop

[phataz]

Does anyone know the difference from a 1579 to a 1578? was looking for a 1578 but dealer only has a 1579.

[Jonny Quest]

1579 (Left Hand Rotation)
1 1/8" shaft. 4-blade. 13.5 X 14.25 with 0.105 cup

1578 (Right Hand Rotation)
1 1/8" shaft. 4-Blade. 13.5 X 14.25 with 0.105 cup

[phataz]

Thanks Jonny i think i need a right hand one , boat is a 1999 super sport

[swatguy]

You def need the RH 1578.


Depending how sac'd out you are you may want to look at a 1236

[phataz]

Is the 1236 for huge weight?

[Jonny Quest]

1236 (Right Hand Rotation)
1 1/8" shaft. 4-Blade. 13.5 X 14.25 with 0.150 cup

The 1236 is very close to the 1578. The only difference is that the 1236 has a steeper cup. If the 1578 has good hole-shot for you, but you turn too many RPMs at higher speed, then the 1236 may just be the ticket.

The heavier the boat (more ballast), the lower the pitch on the prop to maintain comparable hole-shot. To answer your question, the 1236 would be a little worse than the 1578 for a heavier boat.