We flight tested the S-70 with both stages of the tail rotor servos depressurized at the same time, and that was the result. We were almost able to come to a hover ( with rather a lot of force on the left pedal (that force is actuated thru the servo control follow-up link ), but not quite, hence the emergency procedure to perform a run on landing if that dual failure were to occur.
Very true John. We used to do the same for training students on the S70 back in the early 90's before we had access to simulators. Pull the APU C/B and then fail the the #1 Hyd system......
Result - both T/r servos without Hyd power.
It worked a treat. Built huge confidence in instructors/students alike in the capability of the S70. Directional control as you got below 40KIAS got far more dependant upon wind/cross wind and gusts than simulators can hope to predict.
You learnt quickly that airspeed was your friend in T/R malfunctions....providing you have a fin with descent camber on it.
Speed/attitude control as speed decayed and the pedals got heavier, was essential. Amazing how only a matter of a couple of knots could make the difference in accurate directional control and a straight and totally manageable landing.
Its this amazing and variable effect that happens in real life that simulators sadly can't faithfully reproduce as Crab said earlier. With fear of being called a heretic, perhaps we need to start to recognise the shortfalls of simulators in realistic training in particular for helicopters and low manoeuvres and adapt training accordingly.
Back to the original thread........Excellent design without a doubt......
As an aside and ref loss of tail rotor drive; I had heard an anecdotal incident back in the late 80's of a UH60 losing total tail rotor drive and his #2 (in the formation) calling the incident as the tail rotor (of lead) came to a complete stop. Lead entered a shallow descent and had a slight right hand turn on to maintain better control. But as I remember they landed OK but am uncertain of the finer points of the termination of the incident. But I was talking to a member involved in the incident....so it couldn't have been too messy.
cheers
RG