yes
Yes, the more powerful the jet ski the better. A pole attachement of the back will probably make it easier. You can waterski behind pretty much anything - the mythbusters did it behind an rowing team. In most States, the jet ski must be rated for three people and you must have an observer to notify the driver if the skier gets in trouble. In some States, mirrors can substitute for the observer, but this is extremely dangerous. The driver should be concentrating on driving and someone should be watching the skier at all times so they can alert the driver if the skier is in distress. The skier counts as an occupant.
You need three people and a three-person jet ski. One person is the driver. One is the observer, who watches the skier and alerts the driver if the skier is in distress. The third is the skier. Connect a ski line, at least 40 feet long, to the jet ski. Usually the line connects to the aft mooring clip. Work out hand signals between the skier and observer before skiing (slower, faster, speed okay, pick me up, emergency). All three people must have PFDs (life jackets). Ideally, the skier should have a marine rescue whistle attached to their life jacket. The observer should sit behind the driver and face the skier. There are too many cautions to list them all here. Do not let the jet ski run over the ski line. Do not let the ski line tangle on the skier. If the observer falls off the jet ski, do not let the skier collide with them. Make sure the driver is very confident in their ability to operate the jet ski, the jet ski is in good mechanical condition, and the jet ski is one that is very stable (larger and wider is better).
The safest are for towing a jet skier is in a large, open are like the center of a lake. This reduces the risk of striking hidden objects and running into other boaters.
The 1968 428 Cobra Jet has 335 horsepower 428-CI Cobra Jet V8
How many horsepower is a 1200 Yamaha Waverunner horsepower rated at
60000
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130 horse power
NO
Jet engines are rated in 'pounds of thrust', not horsepower. There may be some type of conversion chart available to give you a rough idea of what a comparable rating of horsepower might be...but I'm not personally aware of what that might be.
The more horsepower you have, the more thrust you will be able to produce. The more horsepower you have, the more thrust you will be able to produce.