Technical, Techniques, Hints, and Tips > Other Technical Questions...

Handing props

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maninthestreet:
Can someone please remind me of the way to determine whether a prop is LH or RH. Also, which way should a prop rotate, once you know whether it's LH or RH.

Thanks.

boatmadman:
Hi,
Look along the line of the prop shaft from aft to forward. if the blades are angled so that the edge of the blades closest to the bow is on the right hand side of each blade, it is a right handed prop and should rotate clockwise for forward motion. Vice versa for left handed.

Just got up from nightshift so if my left and rights are crossed.......... ;D

maninthestreet:
'bow' meaning the front end of the boat, I assume?

meechingman:
Yup, the 'pointy' end!  ;D

OUt of interest, on a twin screw vessel, should the props turn inwards or outwards? My late father's tug (a real one!) had screws that turned outwards - ie right handed screw on the starboard side, but I've seen ships and models that do the opposite. Is there any advantage to one or the other?

Andy G

boatmadman:
its something to do with manouverability versus speed...but dont ask me which!!!!

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