"Parbuckle" Capsize recovery technique

New to me.
Very impressive capsized power boat recovery

https://www.youtube.com/shorts/9Fd6T2AB1jc

 

I’ve done a couple of this type of recovery’s, found that it helps to rig the “flip line” looped on the tow and returned to the towboat so that it can be released without stopping forward motion once the tow is righted.
Some well timed surges of throttle can spill enough water over the transom to then get it floating.

 

How many hp does one need?

And this assumes the capsized boat is pos buoyant; does the vessel also have plugs pulled? That would mean swimmin.

How is the tow line rigged for pressurized release? Knife or some pull apart knot?

 

The example in the video looks like it might have benefited from some more room between the boats, as the prop wash might have been interfering with the righting of the tow.
Horsepower calculations? I don’t think there’s a documented formula, but The captain of the tow boat should be very confident that his craft can do the job before fastening to it, especially in open sea conditions as shown.
It’s always prudent to have a sharp knife handy in this line of work!

 

Agreed @kapnD . That was my first thought. The propwash is blasting directly against the tow.

 

I've done this with about 60 - 80 feet of polypropylene tow line out, 2 x 225HP outboards on a rescue Zodiac.
The white water from the props doesn't seem to hinder the operation.
Not a lot of throttle (HP) is required.
The prop wash velocity helps with the righting moment by increasing the apparent speed through the water of the tow.

Everybody on a towboat carries 2 or 3 knives and there is a small hatchet, and a knife, strapped to the tow bollard.