Variable Pitch Props and Shaft Brakes

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Variable Pitch Props and Shaft Brakes

Postby BlowingOldBoots » Thu Dec 19, 2019 12:20 am


I am fitting a new propellor to the yacht and considering something like a Bruntons Auto Prop. A colleague suggested that because I have a hydraulic gearbox, which can't be locked, I will need a shaft brake. The logic I think is that water flow across the prop due to sailing and causes it to rotate and find a pitch angle. Conversely it needs a locked shaft so that the blades will pitch to neutral.

What do you think? Anyone got any experience of this? A brunt's is expensive enough as it is without fitting a shaft brake.



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Re: Variable Pitch Props and Shaft Brakes

Postby ash » Thu Dec 19, 2019 9:15 pm

Hi Alistair

I inherited a Brunton Autoprop with the boat and find that there are some aspects of it I don't like.

I'm on the boat with just an old phone so will tell you more over the weekend.

Certainly, you would need to stop the shaft to get it to fold.

With a mechanical gearbox, the technique is to leave the engine driving in forward gear at tickover and stop the engine.

Speak later.

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