RST Engineering wrote
Unmitigated bushwa. Most aircraft engines (fixed pitch & CS prop)
will stop the prop at normal glide speeds.

Not a chance Jim... In every Cessna, Piper, and Beech that I have
used for instruction, I would have to slow to nearly stall in order
to stop the prop. And yes, I did do fuel shut-off demonstations
for all of my students. 3-4,000' over the airport of course. :-)

Bob Moore