The parallelogram stick simply removes most of the input that the weight of
the pilots arm and hand might have on the control movements.

conventional stick - pull back - G increases - arm gets heavier and pulls
down on stick - increases sick back effect. Pilot makes effort to correct -
G decreases - arm gets lighter - unloads stick!

In rough air the effect starts with G loads from turbulence.

The theory is that PIO's are less likely in a ship with a parallelogram
control setup.

Ian

"Shawn Curry" wrote in message
hlink.net...
STUART SCHWARTZ wrote:

The 303 and 304 (plus some/all? DGs) have a parallelogram control stick.
Instead of rotating back and forth around a point at the base of the
stick, it slides fore and aft along a line (roll control is the same as
a conventional stick). This was a non-issue for transitioning into the
303, but it decreases the tendency for turbulence to bounce your hand
resulting in uncommanded pitch changes. I don't really understand why
it works (and frankly don't care , but it does.

Cheers,
Shawn