I think the most ironic thing about that video was the intense practice to try try try to get back to the airport when there was a perfectly acceptable beach right below. I bet lots of folks have bought it trying to get their stricken aircraft back to the airport despite the presence of other acceptable places to land. And if the OP thinks he really has this under control he'd best think about the difference between an airplane at idle power and one at no power.
I'd like to know the CFI's name so I can avoid him like the plague. This should have been performed at altitude. There was no reason whatsoever to take that kind of risk.
I have researched the difference between Idle Power and No Power a bit. I would wager lunch that a 182 with the engine out and prop pulled back actually glides better than one at Idle power.
What I actually found that is, that
practicing engine out landings at idle power is very realistic and few pilots could tell the difference between and idling engine and just a windmilling prop.
And yes in a real power failure, depending on the failure, pulling the prop back might not be an option which is one reason why I don't normally pull the prop back for my emergency practice unless the POH recommends it.
It was unclear in the video if they were pulling the prop back. Perhaps the instructor was saving that option just in case they needed the extra glide to get back to the airport.
I think the lens on the camera makes the distances and altitude appear worse than they really were.
Practicing the Impossible turn is much like the Impossible turn itself. There a number of factors that can make it safe or unsafe(aircraft, loading, runway length, density altitude, light wind conditions, instructor).
Unlike gliders where we can make a general rule that 99% of the time we can make the 180 turn back to the runway from 200 feet. ASEL aircraft have a much lower percentage of takeoffs where a turn back to the runway as option and more factors need to be considered.
At my 5000' runway at 2500 ft MSL, on most days in most aircraft I fly there is very good chance that once I start to turn my crosswind (500-700ft) I can make it back to the runway. On a hot day, heavily loaded and calm winds it might not be an option.
After practicing it quite a bit my two rules for the Impossible turn are.
1. Do NOT try it for real unless you have practiced it under similar conditions (aircraft, loading, runway length, density altitude, light wind conditions) . It truly is (should be) an impossible turn if you haven't practiced it.
2. Do NOT turn back if you are under 500 feet. May be higher in some aircraft and conditions.
If you are going to practice the "impossible turn" I strongly recommend doing it with an instructor present just to watch over your performance and help evaluate if the conditions are safe to practice it.
Brian