I'm going with BT on this one.... I know the post is about the potential for
engine damage, and I'm guessing that the people using this technique are
worried about shock cooling caused by the prop driving the engine and
forcing the engine to digest more cool air through it's cylinders than
normal.... just a guess... but I'd be more worried about what it teaches the
student. Think about it. Even at idle the engine is producing "some"
power. However you want to explain it, power either produces lift or
extends glide range. I'm not sure that 1 notch of flaps produces enough
drag to overcome the increased lift created by the 1500 rpms + flaps
configuration.
Just a thought. (But I'm on so much cold medicine I might not be thinking
to clearly)
--
Jim Burns III

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"BTIZ" wrote in message
news:nl_Wb.15852$IF1.7345@fed1read01...
you don't get much of an "engine out" at 1500RPM

sort of builds a false sense of security of the seemingly good glide ratio

BT