New Gori propellers lift catamaran’s performance



New Gori three-blade single pitch propellers retrofitted to its saildrive engines have given a 44ft Queensland catamaran more manoeuvrability, responsiveness and stopping power.

image4Brisbane-based Chris Petersen was using his Leopard Sail catamaran to make short-stay trips around southeast Queensland and wanted to extend his trips to medium-length coastal cruising. To do so, he decided to upgrade his propellers to reduce drag when sailing and get better low-speed responsiveness and stopping power at anchorages and marinas when under power.

After consulting with Power Equipment’s Queensland branch manager, Michael Blair, Chris opted to install the new three-blade single pitch propellers from Gori on his Leopard. The single pitch (SP) version of the Gori three-blade propeller is simple to install and offers sailors fail-safe motoring.

Chris says the new propeller offers excellent low engine RPM operation and stopping power that exceeds his original propellers by 50 percent. The new Gori design also offers the lowest drag of all sailboat propellers in its class, so the refit has improved his sailing performance.

Based on the standard three-blade propeller that Danish company Gori introduced in 1994, the new SP propeller has no overdrive, so it is simple to operate.

Its 360 degree blade inversion design offers identical pitch in forward and reverse. The propeller does not auto-rotate when folded and therefore does not require a shaft brake.

Paired with the 13-tonne Leopard’s twin 39hp Yanmar 3JH5/SD60 saildrive engines, the new propellers give a maximum speed of nearly 10 knots and a comfortable cruise speed of 7.5-8 knots at an economical 2400-2450 RPM.

image3Chris says the new Gori propellers are noticeably smoother across all speed ranges, a feature that other boat owners with the new propeller have noted.

Power Equipment says European and South African boat yards are already offering the new Gori three-blade SP propeller in new builds, and if Chris’ experience is anything to go by, it will be popular for refits and new-builds in Australia.

The new SP propeller is currently available for saildrive engines only in a left-hand rotation in 15 to 20-inch diameters.

Next year, Gori plans to launch a shaft propeller range in the same design in 22-26 inch sizes for applications of 10hp to 300hp. These propellers will include a right hand rotation variant.