The Outboard engine: 50 -70 h.p.

For 50 h.p: we recommend the propeller screw with the pitch 12,5 " for water skier towage and for full load travels; a pitch 13" screw is the most universal one, pitch 13,5 " is most convenient for use with the 1 or 2 passengers onboard.

 Very good mileage shows the Honda BF50 engine with a 4-blade Propulse screw with adjustable pitch (this screw lowers the maximum speed by1,5 - 2 knots, but allows to cover all requirements with one screw). The maximum speed with a 50 h.p. engine is about 25 knots depending on the actual loading.

 When a 60 h.p. engine and a 15" pitch screw are used, the maximum speed increases to 28 knots.

When a 70 h.p. engine and a 17" pitch screw are used, the maximum speed increases to 30 knots.

 We do not recommend to mount more powerful engines because it considerably increases the STM 4700 Sportfun speed (up to 40 knots with the 90 h.p. engine and 19" pitch screw) which is unsafe since the catamaran flies at the rate of 18 m in one second, and aerodynamic elevating force reaches 10 % of displacement. To control such a small catamaran at such speed requires a lot of experience and skill.

 Trailers:

The catamaran can be transported on any trailer with the 750 kg capacity.

If you purchase a trailer yourself and prepare it for STM 4700 SportFun transportation - herebelow are the necessary dimensions of the frame.

 The rest of transportation, launch and lifting from water does not differ from similar operations with a one-hull boat of the same size.