Just a thought - what ever the source of power - 6 volts would be worth considertation. Generally, servos are rated at both 4.8 volts and 6 volts. The servo is able to achieve it's full potential or maximum torque rating with the 6 volts power source. In a smaller boat like a Victoria, it might not be as critical as in a larger boat carrying more sail area.
I run 6 volts in all my boats for that reason. I like having the power there when I need it. When selecting sail servos, while I don't disregard the 4.8 volt rating, I am more interested in the 6 volt rating. Using rechargeables is certainly the more "green" way to go, but honestly using four 1.5 volt AA batteries I can operate a 1 Meter yacht for hours upon hours with no issues.
It is really a personal choice - but 6 volts is my choice.
Windchaser