Topgun505 Posted January 20, 2015 Posted January 20, 2015 (edited) I recently started practicing in earnest on the Huey. I finished my own custom checklist and started takeoffs, hovering (holy he** it's a lot harder than the KA-50) and landing. One thing I have noticed is that if I crank up the collective past around 80% or so I actually hear the engine/blades slow a bit and soon thereafter the Low RPM warning blares. If I lower the collective a bit the engine spools back up and the RPM warning goes silent. Is this normal or is something not set right? Governor switch is on and I have tried this with pitot and de-ice both on and off. I have also replicated this on some of the UH-1H missions where the helo is already started so I'm guessing this is normal but I wanted to make sure. Edited January 20, 2015 by Topgun505 Topgun505 Win 11 Pro, Intel Core i9-14900kF, Gigabyte RTX 4080 Super, 128 GB DDR5, Corsair Hx1000i, Alienware 34" 2K LED, TrackIR 5 Pro, WinWing F-16EX, WinWing F-15Ex throttle, VPC Warbird rudder, Thrustmaster MFDs x3, Black Hog box.
Paganus Posted January 20, 2015 Posted January 20, 2015 That's normal. By raising the collective you pitch the rotor blades into the air. Beyond a certain point the resistance of the air is strong enough to bring the engine RPM down, triggering the alarm.
Flagrum Posted January 20, 2015 Posted January 20, 2015 Well, it is normal. And something is not set right. :o) What is not set right is your collective - you pull too much collective. You should avoid this from happening. Now the question is "how?" ... Try to be gentler with the collective, allow the RPM to stay steady by giving the engine time to compensate for the collective change. In general, you should be more carefully, the heavier the helo is.
Topgun505 Posted January 20, 2015 Author Posted January 20, 2015 Very true Quarter. Once you learn how to avoid rotor-slap the KA-50 is a breeze to fly and hover. The UH-1H is more difficult by comparison. It makes me wonder how accurate the KA-50 flight model is. Is it REALLY that simple? Topgun505 Win 11 Pro, Intel Core i9-14900kF, Gigabyte RTX 4080 Super, 128 GB DDR5, Corsair Hx1000i, Alienware 34" 2K LED, TrackIR 5 Pro, WinWing F-16EX, WinWing F-15Ex throttle, VPC Warbird rudder, Thrustmaster MFDs x3, Black Hog box.
Flagrum Posted January 20, 2015 Posted January 20, 2015 Very true Quarter. Once you learn how to avoid rotor-slap the KA-50 is a breeze to fly and hover. The UH-1H is more difficult by comparison. It makes me wonder how accurate the KA-50 flight model is. Is it REALLY that simple? The coax rotor design is already a bit more forgiving, but the main aspect would be all the electronic gizmos (aka "autopilot" / stabilization system) that the Ka-50 has built in. Have you ever tried to fly the Blackshark without the stabilization system (i.e. not just the 4 ap hold modes disabled, but also the dampening?) ;o)
outlawal2 Posted January 20, 2015 Posted January 20, 2015 Very true Quarter. Once you learn how to avoid rotor-slap the KA-50 is a breeze to fly and hover. The UH-1H is more difficult by comparison. It makes me wonder how accurate the KA-50 flight model is. Is it REALLY that simple? Many helicopters can be made to be as simple to fly as the Shark, but it requires electronic stabilization equipment that costs as much (and in some cases more) than the helicopter itself.. (That is why you won't see an R22 with an autopilot) If they ever decide to price that equipment realistically, all helicopters would be that simple to fly.. As usual the money is the issue.. "Pride is a poor substitute for intelligence." RAMBO
Topgun505 Posted January 20, 2015 Author Posted January 20, 2015 Yes I've had those systems shot out from under me. Heck I've had my tail entirely blown off a few times. Topgun505 Win 11 Pro, Intel Core i9-14900kF, Gigabyte RTX 4080 Super, 128 GB DDR5, Corsair Hx1000i, Alienware 34" 2K LED, TrackIR 5 Pro, WinWing F-16EX, WinWing F-15Ex throttle, VPC Warbird rudder, Thrustmaster MFDs x3, Black Hog box.
harm_ Posted January 21, 2015 Posted January 21, 2015 Low RPM warning with high collective The key of flying the huey, IMO, is being gentle with the control inputs. It takes time to get used to the movements you have to do to perform the maneuvers. For instance as you increase power yo have to input left pedal to compensate for the torque, if you lower the power you have to release left pressure If you hear the low rpm warning lower the collective just a tad bit. Also making abrupt cyclic movements can make the rpms go low. Just make small movements. With some practice you will get used to it and will start loving the Huey as much as I do.
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