What experience do you have that indicates that this is a risky
maneuver.

C'mon, common sense says that stopping the prop on an powered airplane is
maneuver that has some risk. As I said there is a tradeoff. Let's not get
into arguing over the tradeoff or what risk is acceptable. This is just a
rehash of the old spin training debate.

And certainly the airplane and environment matters. There is little risk in
practicing very realistic engine-one scenarios in a low-traffic environment
with a plane like a C-172 or VW-powered homebuilt. But it's a whole
different deal in a Bonanza or T210 at a busy field.

You make your own tradeoff, but if I ever have a CFI that wants to practice
the maneuver to the point of stopping the engine, I'll decline and find
another CFI.

- Mark