Propeller

Hull

Appendages

Stability

Rig

Sails

Accommodation

Propeller

Propeller installation is an important factor determining a boat's performance. While many racing boats have a folding propeller to minimize its drag, there can be a considerable difference in drag if the boat has a strut drive or shaft installation, just as there is a difference in drag for fixed, feathering or folding propeller blades. This is all defined by the propeller measurements.

Propeller types

Solid Propeller

Folding Propeller

Feathering Propeller

Propeller installation types

Strut Drive

Shaft Exposed

Shaft not Exposed

In Aperture

If there is no propeller in the water while racing, this shall be recorded as "No propeller".

Measurements

Each propeller type and installation requires a specific set of measurements. It should be noted, however, that the IMS Editor software contains predefined strut drive measurements for different standard production models, which require only the height of the strut drive and the distance from the keel trailing edge to be recorded. However, basic measurement tools allow propellers to be measured in only about 20 minutes.