Anyone else having difficulties with autorotationâ€™s?
It seems as if the skids have too much grip to slide resulting in nosing over if almost any forward speed is carried into the landing on flat ground (airfields)
But more importantly at a >60Kts IAS <130Kts IAS attitude (correct for an MD500E) it is very hard to maintain or gain any rotor RPM on the decent prior to flare, also the transition into flare also doesnâ€™t seem to put in or take out a high enough energy/RPM into/out of the rotor dependent on condition of transition method.
Itâ€™s almost if its related to the excess of down thrust at 0% collective that is working agenised maintaining or gaining rotor RPM during autorotation i.e. as if excess blade pitch at 0% collective is conspiring to slow the rotor witch you would normally do by applying collective in conjunction with maintaining forward speed & rate of descent to keep the rotor within the >410RPM to <523RPM limits.
Myself in game even with 3 additional passenger for extra weight 0% collective and optimum speeds rotor RPMs always fall to ~80% (~375RPM) even at >3000ft/min descent with no means to recover or stop losing that RPM, even at an aggressive flare it only just reaches ~88% (~410RPM), with just the pilot in the number are ~75% (350RPM) and ~80% (~375RPM) just as the transition loads up. (Being done in the throttle closed position)
MD500E (taken from the MD500E ROTORCRAFT FLIGHT MANUAL - Emergency Procedures)
410RPM to 523RPM (~88% to ~108% - green zone) rotor speed,
Below 468rpm (~98%) rotor speed warning takes place,
Adjust collective pitch according to altitude and airspeed to maintain rotor speed between 410 and 523 RPM.
Autorotation specs (ENGINE FAILURE >500ft AGL):
Maximum glide distance @ 80Kts IAS / 410rpm #1
Minimum rate of descent @ 60Kts IAS / 410rpm #1
Maximum speed for autorotation = 130Kts IAS
#1 = If operating at reduced rotor RPM to extend glide or reduce rate of descent, restore rotor RPM by lowering collective prior to flare out.
The implication of the above official MD500E data is with just a pilot in and less than a full tank of fuel Maximum glide distance (80Kts IAS) or Minimum rate of descent 60Kts IAS both at 410rpm should relatively easily be maintained with some collective applied in order to maintain 410RPM and that RPM should be able to be regained well above 410rpm in the region of >470RPM or more as noted by â€śIf operating at reduced rotor RPM to extend glide or reduce rate of descent, restore rotor RPM by lowering collective prior to flare out.â€ť