KELPkid From United States of America, joined Nov 2005, 6234 posts, RR: 4
Reply 5, posted (5 years 2 weeks 2 days 16 hours ago) and read 2372 times:
If one were to fly a GA plane with unboosted controls on the back side of the power curve (low airspeed, high power required to maintain flight), the controls feel very "mushy" (little force required to move the controls around), because the normal aerodynamic loads on the control surfaces that cause the pilot's controls to resist movement are greatly reduced. This is an example of a tactile warning (in this case, that you are near a stall and should probably take action to increase power and reduce angle of attack).
The normal reaction for a plane with unboosted controls is that control forces tend to increase with the increase in speed.
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
Stickshaker and stickpusher would definitely fall in that catagory. In a FBW airliner with force feedback, you could consider the whole backdrive system a tactile warning (or at least a tactile feedback).
Quoting Moose135 (Reply 6): Which is why the landing gear handle has an end shaped like a wheel, and the flap handle has an airfoil shape. (At least that was the way they were when I was flying with Orville and Wilbur!)
Still true on Boeing, at least through the 787. Thrust levers, flap lever, speedbrakes, gear handle, fuel cutoff, trims, and the light switches all have very distinct knobs so you can recognize them by feel.
Jetlagged From United Kingdom, joined Jan 2005, 2526 posts, RR: 24
Reply 8, posted (5 years 2 weeks 9 hours ago) and read 2051 times:
Quoting Tdscanuck (Reply 7): In a FBW airliner with force feedback, you could consider the whole backdrive system a tactile warning (or at least a tactile feedback).
That would apply to any flight control with an artificial feel unit, not just FBW. It's not really a warning, it's normal operation. However if, as on the 777, this force feedback is increased if you go beyond envelope limits then that definitely is a tactile warning.
A different kind of tactile feedback exists on the Airbus FBW, where the sidestick is held in the centre with autopilot engaged requiring a significant extra force to move it (and so disengage the autopilot)
The glass isn't half empty, or half full, it's twice as big as it needs to be.