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TOPIC: RH vs LH propeller?

RH vs LH propeller? 15 Sep 2017 15:53 #1

  • Raestlin
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2008 Bayliner 175, Mercruiser 3.0L

Just bought this boat about 3 weeks ago.
The old propeller was a RH, so I bought a new RH propeller.
However, working on my engine last night, I noticed the info label (picture attached)
mentioned that the engine is a LH rotation.
Does that mean that I should be using a LH propeller, or is that just the engine that's LH,
and the stern drive is still a RH propeller?

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~ 2008 Bayliner 175, Mercruiser 3.0L 4cyl, w/AlphaOne (Gen2) 2.0, 14.25" 21p
Last Edit: by Raestlin.

RH vs LH propeller? 15 Sep 2017 16:15 #2

  • Centerline2
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it means the drive has been set up for an engine that rotates to the left, which is the normal rotation for an engine...
some engines are built to rotate to the right so that when twins are installed, the torque of the two engines cancel each other out.... this is not common in smaller boats unless they are very high HP motors.
its much easier and quicker to change the way the shift cable throws the lever in the gearbox, so that the output shaft turns to the left, so that the prop torque of the dual screws oppose each other.

if that drive was connected to a RH engine, it would need a different top end gear set..

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1989 Bayliner 2556, 5.7 OMC Cobra
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RH vs LH propeller? 15 Sep 2017 16:43 #3

  • Ruffryder
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right handed is considered as normal, a LH prop would usually be fitted to a counter rotating set up.

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RH vs LH propeller? 15 Sep 2017 22:34 #4

  • Centerline2
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Ruffryder wrote: right handed is considered as normal, a LH prop would usually be fitted to a counter rotating set up.


correct. a right hand rotating prop is considered the normal standard rotation, but a left hand rotating engine is considered normal...

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1989 Bayliner 2556, 5.7 OMC Cobra
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