In article ,
Dudley Henriques wrote:

Ron Garret wrote:
In article XoH1k.16394$qP.15098@trnddc03,
TheSmokingGnu wrote:

More_Flaps wrote:
How can I tell if my loops are perfect
circles?
Ask Dudley for technique, but as for the physics: a perfect loop would
have a constant acceleration.

Only in zero G.

Just take an accelerometer with you and
see how consistent you are (preferably one that can discount the Earth's
gravity,

Are there such beasts? I know it's theoretically possible, but it would
be very hard (and expensive) to build such a gadget. Do they really
exist?

rg
Yes. The Naval Test Pilot School uses extremely sensitive accelerometers
on the T38's used for coupling and departure research flights.

It's not so much that they have to be sensitive as that they would have
to incorporate an AHRS (or something equivalent) in order to figure out
which way is down.

And what is a coupling and departure research flight? And why would you
need an accelerometer that compensated for gravity to conduct one?

rg