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S A L E S 

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Sales
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Victoria Propellers

Retail Outlet
1650 Belford
Nanaimo, B.C. Canada

Repair Shop
3385 Trans Canada Hwy
Cobble Hill, B.C. Canada

Phone: We take telephone orders and ship anywhere.

Cobble Hill: 250.743.8151
Nanaimo:    250.753.9700
Toll Free:   1.800.665.0616








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Choosing the Right Prop

A propeller converts the turning power of a marine engine at the shaft (called torque) to usable power which moves the boat (called thrust). It works like a pump, sucking water from ahead, accelerating it and then discharging it astern. This produces thrust which pushes the boat forward.

Different boats require varying amounts of thrust (and consequently varying amounts of slip) to propel them efficiently. Slow moving, heavy boats require high thrust and operate most efficiently at high slip. Fast moving, light boats require relatively low thrust and, therefore, operate most efficiently at low slip. Thrust is developed by accelerating a mass of water. It might seem that the same thrust could be attained by turning a small diameter propeller rapidly (giving a high acceleration to a small mass of water), or by turning a large diameter propeller slowly (giving a low acceleration to a large mass of water), but this is not necessarily so. Energy is lost in friction between the accelerated water and the surrounding water. Therefore, in selecting a propeller shaft speed, it is important to strike a favorable balance between shaft speed and boat speed. The resulting propeller size should have a pitch ratio (pitch divided by diameter) according to the following table for best efficiencies:

Type of Boat Pitch Ratio Range
very heavy cruisers
average cruisers
medium and fast cruisers
high speed cruisers, & runabouts

.55 to 0.8
.65 to 1.0
.80 to 1.2
.90 to 1.5

Victoria Propeller uses a computer based selection questionnaire to help you choose the correct propeller for your boating needs. Based on your feedback, we will provide a suggestion to help optimize your boat’s performance.