"It's like UFO sightings, a whole bunch of people are convinced
that they've seen flying saucers, but I've never witnessed it
myself. Looks like Scully better open an X-File on this. "
Well, I there is that thing with torque

....
P-51s zoom up to about 100mph, and when it stalls, it stalls
horribly, so they can't do really tightly calculated Ropes...
In case of 109s they can go down to hefty 50 mph vertical
but the plane keeps squriming out of control, leaning/waning
to one side...
I don't feel much torque when I fly a Spit straight vertical.
I remember when I tried a vertical with a Spit..It noses up
but I didn't feel any sort of warnings of stall.. nor did I have
to influence the controls to keep the nose straight up.
I was fairly surprised when the plane just went straight
vertical and reached absolute 0 mph, and then, without any
sort of indication, just plain fell into flat spin.
..
Spits and N1K2s don't hang as long as other planes, but once
they go vertical, they just go straight up.
And then that point where the 600~700 yard spraying with
Hispies and Type99s

come out and..

..
but still,
Spit9 should not be perked.
Maybe some indication of torque, yes.. but I can't think of
ANY reason to perk a Spit9.