Secondary effects of controls....

[Aussie_Paul]

Monday the 14 June.

Finally an hour to myself. The house is empty and I have just finished making a nose wheel suspension system for Hyrbrid (Raf nosewheel). Until I get back into the airport I am operating from a rough grass strip.

I have always had a yearning to design a front suspension for the Rafs, but never had a good enough reason until now. I am not sure if it will work, but you can bet your last $ that if it works I will get back into the licenced airport asap. Murphy or something.

Ok, as per the subject "Secondary effects of controls...."

Who has an opinion as per secondary effect of yaw caused by applying rudder?
In an aeroplane, if you apply left rudder, the right wing speeds up, more so at the tip. This extra speed causes extra lift from the right wing, and the right wing rises and the aeroplane banks(secondary effect) to the left.

How does a gyroplane behave during the same rudder input?

Aussie Paul. :D

[rfi]

Paul,
The rotor doesn't care what direction it is flying. As far as I know nothing happens except that you yaw in the direction of rudder input. There might be a slight effect due to gyroscopic precession of the prop.

[Al_Hammer]

In a gyro, in forward flight, if you kick in some rudder, you yaw the aircraft and point the thrust in a new direction.
Meanwhile, the gyro is still travelling straight ahead, so the relative wind is now coming from the side.
The rotor always flaps or "blows back" in a direction "away" from the relative wind.( the flap angle is usually only a couple of degrees)
The result is that the the aircraft will start to gradually bank in the direction of the turn. See below.


Rudder pedals are normally not needed during a turn in a gyro. Turns are made with stick only.

It is interesting to note that:
most more modern general purpose f/w are equipped with differential linkage, or Frise ailerons, or some
other way to minimise adverse yaw. You can actually fly a coordinated
turn in most Cessnas and Cherokees, not to mention larger transports,
with NO rudder. That is one reason we are raising a generation of pilots
who fly with their feet on the floor and take forever to get a tailwheel
endorsement.

[Doug Riley]

Non-tall tails (Bensen, RAF, Brock, Gyrobee, etc.) create a bit of roll when deflected. That's because the center of effort of the fin-rudder unit is considerably below the aircraft's CG. The tail creates a tendency to bank into the turn. This adds to the rotor's "pseudo-dihedral" effect that Al mentions. Both effects tend to coordinate a slipping turn.

If you WANT to slip or to do a twirling vertical descent, you need not only a rudder input, but also a cross-controlling stick input to defeat the gyro's tendency to bank into a yaw.