Airboat? Snow sled? Outboard boat engine powered? What in the world?
Your outboard motor doesn't necessarily have to be put away when the boating season ends. With a few mechanical changes, almost any 10-hp, or larger motor can be put to work the year 'round and used to propel an ice sled.
Speeds up to 35 m.p,h. are possible with a payload of three.
The change-over in no way reduces the efficiency of the motor as an outboard engine. To modify the motor, the water intake and output systems must be sealed and a radiator installed in line.