Performance Propellers

Size Questionnaire

If you have a well-known boat (Catalina, C & C, Ericson, etc), we probably already know the exact prop you need. Go to our props by boat page.

if you have a well known motor go to our props by motor and gear ratio page

Note we are in the process of changing the site location. This page may not work properly. please call for help if you do not get a response within 48 hours,

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. 

Full name:
Email address:
phone
 * required
Please contact me by:
by phone
by email
 
Boat information
 
manufacturer
 * required
 
overall length
 * required
 
length at waterline
 
displacement
 

 
Propeller mounting style

 
prop tip to hull "C"
 
Prop blade to rudder A
 
bottom of prop blade to skeg "C2"
 
Prop forward to skeg "E"
 
Only dimensions for D,C,A are needed for props in open water. Note: in open water configurations the dimension A can be left blank if the distance to the rudder is greater than 20 inches.
 
Propeller shaft diameter
 
Motor information
maker
 * required
 
Motor model e.g. 2GM23
 * required
 
Gear Ratio e.g. 2.25:1
 * required
Present propeller information
 
Present propeller diameter D
Present prop pitch
My present propeller is
 
How does your present motor and propeller work together?
 
maximum rpm of motor with your present propeller
 
boat speed at max rpm
emit black smoke at max rpm?

please quote the following propeller styles

 
Print

What happens next?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

your contact information

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
aperture-sketch.jpg

open water dimensions
open-water-sketch.jpg

 

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.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
propeller styles

fixed 2 blade and extendo
ext-reg.jpg
feathering prop
100_3000reduced.jpg
available 2010

Performance Propellers


44 James Street                                     Phone 607-749-3165

Homer, NY 13077                             Fax 607-749-4604

Email performance.props@verizon.net