Diesel Marine Propulsion Engines & Generating Sets

Saildrive Propeller Guidance

Whilst Beta Marine has had many years of experience learning which propeller normally goes with which engine, we can only give you general guidance, propellers are a complex subject with many variables that can affect a vessels performance and if optimum theoretical hull speed is required a propeller specialist should be consulted.

Our standard range of propellers for the SeaProp 60 are:

  • 2 Blade – Folding
  • 2 Blade – Fixed
  • 3 Blade – Fixed

Propeller Dimensions

Propellers are measured in two dimensions:

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

There are often physical limitations/restrictions imposed on the propeller. This would frequently be the diameter due to the space limitations between the position of the propeller shaft and the underside of the hull (Y). This can be compensated for by changing the pitch but there are limitations to what can be achieved.


Y = the minimum clearance between the tip of the propeller and the underside of the hull and should be 10% (or greater) than the propellers overall diameter (X).

The following chart is an approximation of the required propellers and does not represent a bespoke Beta Marine recommendation.

A dedicated propeller calculation that is unique to your vessels configuration is highly recommended.

A general guidance for propeller (left hand or right hand) dimensions in inches for SeaProp 60 2.15:1 reduction.

SaildriveBeta 14SDBeta 16SDBeta 20SDBeta 25SDBeta 30SD
2 Blade Folding
(Bronze)
14" x 8"14" x 9"15" x 9"16" x 9"16" x 10"
3 Blade Fixed
(Aluminum)
13" x 8"13" x 9"14" x 9"15" x 9"15" x 10"
SaildriveBeta 35SDBeta 38SDBeta 45TSDBeta 43SDBeta 50SD
2 Blade Folding
(Bronze)
16" x 11"17" x 10"18" x 13"18" x 14"18" x 16"
3 Blade Fixed
(Aluminum)
15" x 11"16" x 10"17" x 13"18" x 13"18" x 14"
SaildriveBeta 60SD
2 Blade Folding
(Bronze)
-
3 Blade Fixed
(Aluminum)
18" x 16"

To get a better understanding of the benefits and compromises of each propeller type please read or download the articles listed below or contact a propeller specialist.

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