Not true. I'm constantly having to work the throttle and make course corrections to avoid other boats as well as navigate the course. Our race course measurements are given below:
The standard race course shall:
be oval in shape
have two parallel straightaways
be a minimum of 60 feet from the closest shore
have dimensions that must be: turns 60’ to 120’ in diameter and straightaways 275’ to 400’ in length
Taking all of that into consideration, a boat doing 50 MPH will go the length of the straight in less than 3.5 seconds and complete the turn at one end in around 1 second if the boat is running right on the buoy line.. Unlike an airplane, my boat's rudder is constantly having to hold pressure on its left side as the prop is trying to push the boat's transom to the left. Also, the rudder, prop, and turn fin are going through a substance that 784 times more dense than the air meaning that the servo has to deal with 784 times the pressure on every square inch of the rudder that is in the water as compared to a control surfaces on an aircraft This means that a boat rudder servo alone will used much more power than the combined total used by the servos of an airplane. By the way, my boat weighs in at 14lbs and runs a .67 that can turn up to 28,000 RPM, more than twice the speed of a similar sized aircraft engine