On the surface this looks peaceful doesn't it? Beneath the engine hatch are 2 1100 hp MAN high performance diesel engines coupled to ZF transmissions. The boat is equipped with the Rexroth controls commonly seen on this power-train set up. Interestingly, the transmissions have trolling valves but the owner was unaware of these or how to operate them.
What this means to the average boat owner is that the same engines that give you so much pleasure as you clip along at 35 mph can create quite a bit of anxiety at the dock. All boat owners with this type of boat get familiar with the "half shift". You know what I mean, push it into gear and pull it out quickly before it leaps out of the slip.
By adding a Xenta Smart-Stick you can control all 2200 horsepower with your fingertips. Xenta requires using the trolling valves if the boats equipped with them.
Now for the technical stuff:
The 610 Searay has an Idle Speed of 625 rpm with 1.67 to 1 Transmissions. This equates to a minimum shaft speed of 375 rpm. Given that the propellors are 30 x 39 1/2 and five bladed, the boat in its stock configuration lurches forward at almost 11 mph and will move forward 16 feet in seconds.
The Xenta Smart-Stick uses a signal to activate the trolling valves and when the transmissions engage they engage at 90% slip. As you push the joystick forward it is similar to letting the clutch out on your car. As the clutches engage we start forward motion with a shaft speed of 75 rpm. This brings your shaft speed down to approximately 1.25 rotations per minute. You don't even have to do the math to see how this allows for one handed confident control.
On this installation tied to the dock you can take the slack out of the docklines with the joystick. try to do that with the "Half Shift"