This is the final design for my Stable Speed Boat series. I added a flyable plane to the boat that can be launched from anywhere and has a bomb pod and missiles. I also made the boat a bit bigger and added an extra engine to give it enough thrust for the extra weight. Here's how it works:

1. Turn on the engine and drive the boat to the water. Be careful going down the steep slopes. Use yaw to turn.
2. Once you get to the water (going less than 60 mph) float out a little bit and activate group 1. This detaches the boat launcher and activates the boat's engines and steering. Use yaw to turn and press S to go backwards.
3. When you're ready to launch the plane, move the VTOL slider all the way up, activate group 2 to turn on the plane's engines, wait about 2 seconds for the engines to fully turn on, and activate group 3 to launch the plane.
4. When you want to drop the bomb, activate group 4, and when you want to fire the missiles, activate group 5.
5. When you're ready to land the plane, you will need to bring it in with some power, so make sure to keep an eye on the fuel gauge.

Thanks for downloading and have fun!