02 9533 1633 / + 612 9533 1633

Propeller Size Selection

Austral provides a technical service for inboard, sailboat and skiboat propeller size suggestions. We have an extensive range of software to analyse and compare various propeller sizing calculations, which when combined with our long practical experience, helps ensure the correct choice of optimum propeller for each vessel application. However, our calculations can always ONLY be as accurate as the information provided.

The MINIMUM vessel information required for us to provide a inboard propeller size suggestion includes :- (1) Vessel waterline length (2) Vessel operating weight (3) Vessel style and normal usage (4) No. of engines (5) Maximum rated brake horsepower and wide open rated RPM recommended for your engine(s), and (6) Gear box reduction ratio.

In addition, the current vessel speed and maximum engine RPM being achieved, with a known existing propeller size/style, will provide valuable comparative data when fine-tuning the suggested optimum sizing.

ACCURATE DETAIL IS VERY IMPORTANT Inaccurate vessel and engine information will mean an inaccurate suggested sizing, so please take the time to check your details first.

Our size suggestions are given in good faith, sight unseen. Due to the many variables including, but not limited to, vessel design, hull resistance and operating environments, we accept NO responsibility, nor do we in any way guarantee, the use of the suggested propeller sizes provided by this service.

NOTE: For outboard and sterndrive propeller size suggestions within Australia please contact our sales department on (02) 9533 1633. Please have details of your engine make, HP, year model and the size of the propeller currently being used. (or the part number or stamps off this propeller) For international enquiries, on outboard and sterndrive propeller size suggestions, we generally recommend contacting the outboard/sterndrive dealer in your region.

Propeller Size Selection Service

    Hull Type*



    Vessel Information:


    Engine Information:

    No. of Engines* :

    Fuel* :


    Helpful Information:

    Current Results - Maximum vessel speed and engine RPM achieved at full throttle and at normal operating throttle level

    Additional Information : eg. Existing propeller size, no. of blades and style, stamps/part no. off existing propeller


    Alternatively, click on the button below, download the form and fax the completed form to us.

    Fax No. (02) 9533 3302          International Fax No. +61 2 9533 3302

    Propeller Size Selection Service Form Download
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