In article ,
Vaughn wrote:

"Mark James Boyd" wrote in message
news:402bf598$1@darkstar...

Aerobatics with less than 3 miles vis is prohibited
in the US without waiver, as far as I know...

And in the US you would have to remain at least 1000' above the cloud
(assuming class E or class G 1200' agl.)

actually, there are some fairly large areas of "G" airspace
which go up to 10,000+ here in CA and NV. Spin down to cloud level,
then level descent through the deck. I've never done it myself,
but I'd bet money Carl Herold has...

Not a whole lot of traffic in these areas either, so that's
a very minor issue (big sky, little bullet theory).

Stupid? Maybe (for some folks). Legal, sure.

but the idea still might have
merit given the theory that clouds are usually soft and empty but the ground
is invariably hard.

The guy who told me he spun through a cloud intentionally in his
Pitts said it was psycholigically REALLY hard to hold the spin
through the 500 foot layer through to break out...