In order to calculate which prop is best for your boat and engine combination, Please complete the form below with
the information needed to calculate your propeller.
We usually reply by email within 24 hours with a complete quote and pricing
for your boat and motor.
Ocasionally we will need to clarify information and will reply by email.
Boat considerations
Length at the water line (lwl) determines the
maximum speed of the boat while the displacement determines the power required to attain that speed.
Propeller mounting styles of aperature
or open water.
The dimensions of some configurations can linit the size
of the propeller used on the boat. See max propeller size determination.
aperture dimensions
open water dimensions
Motor Information
The horsepower,
rpm, and gear ratio of the motor are used to calculate the diameter of the propeller needed to transmit the hp and how far
the boat must travel with each revolution to attain the desired boat speed.
Motors are usually specified as supplying horse
power at a specific rpm. However the advertised horsepower is usually peak horsepower, which is rarely used in propeller selection.
The manufacturer often recommendation a different HP at RPM to be used for propeller matching. This can be listed in
many forms: continuous operation, and propeller matching, are a few of the listings. Some
manufacturers will not have an obvious rating, in those cases 80% of rated HP and corresponding rpm is used.
Information about your present propeller and how it is working with your motor helps
us determine if your boat is over-propped or under-propped and can indicate if some adjustments may be needed to supply you
with the best possible propeller.
