Over 1 kilowatt for sure!
This question depends on the type of boat you have. Normally as long as your boat can do around 25+ mph you should be able to pull a skier out of the water. So if you have a 18ft boat with a 115hp depending on the weight of the boat you will be able to tow a skier out of the water.
Assume you are talking about a boat and a water skier. Yes it will work. I have been towed by a 35 HP outboard. It depends on the skill of the skier to be able to get up quickly. It also depends on the skis and the drag they cause while being pulled from the water.
yes
You can pull a skier at around 17ktns so even with a smallish outboard (25hp) on a dinghy its possible.
No, you will certainly drown! Unless you want to start a new trend. Under water skiing.
Row Boat Sailboat Tug Boat Ocean Liner Freighter
Yes, with no problems at all.
Horsepower is irrelevant - it's torque that matters.
sshi
yes
I would say 120 horsepower minimum... I know some people who pull 23 foot disc's with 130 horsepower tractor, but that was on plowed ground... but a 100 horsepower should do the job, at 4-5 mph