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Propellers are a specialist subject and a full understanding needs a propeller specialist. Whilst Beta Marine has many years of experience learning which propeller normally goes with which engine, we can only give you general guidance, please note that we are not propeller specialists.

Propeller Information Downloads

This is a very basic explanation that hopefully explains that you need expert advice from a propeller specialist. If you have any questions please do not hesitate to Contact Us.

Propeller Dimensions

Propellers are normally measured in two dimensions:

  • The actual diameter (frequently measured in inches).

  • The pitch – assuming the blade is set at an angle, then if you followed this angle through one revolution and measured the distance between the starting and finishing point, you will have moved forward the measurement called the pitch.

The propeller size is often limited by the actual space available when trying to fit it in position. These size limitations are frequently the diameter, due to the space limitations between the position of the propeller shaft and the underside of the hull. This can be compensated for by changing the pitch, but there are limitations.

For further information on propellers, please look at the individual manufacturer’s websites for information:

A General Guidance for Propeller Dimensions

In inches – based upon a 3 blade RH (right hand) rotation and a 2:1 reduction ratio.

Beta Marine PNW… More Than Just Engine Sales

We don't want to just sell you an engine, we support the boating community through a comprehensive array of repowers, education and marine diesel engine services designed to enhance our customers’ experience on the water.

Beta Marine PNW is here to recommend the right size propulsion engine and associated materials needed for your repower. If you need assistance with installation, warranty services, repair or service needs, reach out and Contact Us today.

Beta 14 & Beta 16



Beta Marine's Beta 14 and Beta 16 engines are the perfect propulsion engines to replace your Atomic 4 gas guzzler.

Learn more about our Beta 14 and Beta 16 engines.

Small, Powerful, Quiet, Reliable

Beta Marine, marinized Kubotoa engines, are the perfect engines for the boat owner who likes to manage their own routine engine maintenance.

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                               Beta Marine Pacific Northwest is owned and operated by Sea Green Partners, dba SEA Marine, Port Townsend, WA                              

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