Evaluation of elevated the plane of anti-ventilation plate installed on outboard engine propeller on the speed, fuel consumption and craft stability with full-scale

Porpoising inStability in planing crafts is one of the negative properties Which Has great impact on the parameters passenger comfort, speed and fuel consumption. This phenomenon from the aspect of hydrodynamic Has been studied by many people. But the impact of flap system to reduce this phenomenon And its effect on speed and fuel consumption of planing crafts has outboard engine Much work has not been done. According to previous research, If flaps at different speeds, different angles to take will have a positive effect on these parameters. on top of the propeller outboard engines installed plate as the anti- ventilation plate, which also acts somewhat as a flap. In this study, increased plane of this plate and The object craft Real tested in the sea the effect of this increase, The craft parameters listed, be examined. The results showed the positive effect of increasing the plane of the aforementioned parameters.