IS OUR PROP TOO BIG?

Canal Boat - - Back Cabin: Experts -

QThe tip of the pro­pel­lor blade on our boat seems very close to the bot­tom of the boat and the clear­ance is only about one inch from the swim, will this cause any loss of power? Should we fit a smaller prop?

R MARTIN, via email

ANICK REPLIES... It sounds a lit­tle tight, but it should be all right. Re­duced pro­pel­lor tip clear­ance is more likely to re­sult in ex­tra noise and a greater like­li­hood for some­thing to jam be­tween the tip and hull or skeg than to re­duce the thrust in any mean­ing­ful way. It’s quite pos­si­ble that the boat orig­i­nally had a smaller prop that sim­ply wasn’t up to the job.

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