Slow Flight Question (back side of power curve)

[photofly]

To throw something else into the mix:

The gyroscopic effect that causes yaw depends on pitch rate; the faster the change of pitch angle, the greater the yaw force. Other effects depend on pitch angle only. If you raise the nose slowly the gyroscopic effect will be small, and once you reach a fixed pitch angle the gyroscopic effect goes away, but the effects from asymmetric prop-wash, and different airspeeds over the rising and descending prop blades (et al.) will remain.

[Colonel Sanders]

Correct! Unless an aircraft is pitching (or yawing)
you will not experience any gyroscopic precession.

However, the effects of coiling slipstream, torque
are a function of airspeed - slower you go, the worse
you get - and the effect of asymmetric thrust is
solely a function of AOA.

The above is why people struggle with the hammerhead,
where the aircraft pitches vertically at high speed,
comes to a stop, pivots, and flies the vertical downline.

The first half of the vertical, the airspeed is high enough
that you don't really have to do anything.

The second half of the vertical, the airspeed is decreasing
enough that you start to feel the effects of coiling slipstream
(requiring some right rudder) and torque (requiring some right
stick).

The pivot - where you apply full left rudder - is when you
will encounter the effects of gyroscopic precession. With
a metal prop, if you do not put the stick all the way into
the front right corner during the pivot, the left yaw will
put you on your back into the prettiest inverted spin you
ever did see. Kind of fun, really.

Pop Quiz: With a Lyc or TCM, why do you only pivot left
during a hammerhead?

[Beefitarian]

Is it going to cause the nose to keep from dropping relative to your position?

[white_knuckle_flyer]

Pop Quiz: With a Lyc or TCM, why do you only pivot left
during a hammerhead?

Is it to take advantage of the slipstream which will kick your tail out more cleanly ?

[Colonel Sanders]

Correct! With Lyc/TCM, you always hhead left
to let the slipstream help you pivot.

Sukhoi/Yak pivot right.

With a composite prop, you can hhead right
with a Lyc but it is ugly.