To: Nick Lappos
On older Sikorsky helicopters there was a built in bias in the mixing units to compensate for the right translation caused by the tail rotor. Several models did not have this facility so the pilot had to apply left cyclic in a hover. At full collective the swashplate would be tilted 7-degrees to the left and the mast was tilted 3-degrees forward of vertical, which made the helicopter, tilt to the left and hang tail low. On those helicopters equipped with ASE the ASE black box was placed in a position to reflect the 7-degree tilt to the left and 3-degree tail low and the output signals were nulled out then the black box was placed back on its’ attachments to the airframe. On those helicopters equipped as SONAR dippers the signal generated by the cable pick-offs were also nulled out to compensate for the left tilt-tail low condition so that the helicopter was only subjected to movement caused by the water currents that displaced the SONAR cable.
My question is this. On the UH-60 and the S-76 is there the built in bias in the mixing unit or, does the pilot have to move the stick to the left in a hover?