Rabies Posted June 18, 2021 Posted June 18, 2021 Upon landing and decreasing the throttle on the collective and having the engines in idle, I have noticed the engine temperature gauge drops too quickly and engine, rotor transmission oil pressure drops to zero.
XPACT Posted June 18, 2021 Posted June 18, 2021 19 minutes ago, Rabies said: Upon landing and decreasing the throttle on the collective and having the engines in idle, I have noticed the engine temperature gauge drops too quickly and engine, rotor transmission oil pressure drops to zero. Your rotor RPM drops below threshold for AC generators shortly after you throttle down to idle and they go out so some gauges stop working. If you want to throttle down to idle I would flip PO-750A inverter to ON that will use battery power for those gauges and some systems when AC generators go out. Keep in mind that even with PO-750A in ON position you will lose gyros and autopilot channels. 1
Whisper Posted June 18, 2021 Posted June 18, 2021 Is there a way to know the AC Gens are out due to engine underpowering them? And what RPM are necessary for them to keep powering up things? I've had flights where I kept cutting down things here and there in the cockpit, doing not so violent maneuvering.... Whisper of old OFP & C6 forums, now Kalbuth. Specs : i7 6700K / MSI 1070 / 32G RAM / SSD / Rift S / Virpil MongooseT50 / Virpil T50 CM2 Throttle / MFG Crosswind. All but Viggen, Yak52 & F16
XPACT Posted June 18, 2021 Posted June 18, 2021 12 minutes ago, Whisper said: Is there a way to know the AC Gens are out due to engine underpowering them? And what RPM are necessary for them to keep powering up things? I've had flights where I kept cutting down things here and there in the cockpit, doing not so violent maneuvering.... More or less bottom yellow line on the rotor RPM gauge (left one). The thing is, especially when heavy, if you are for example dropping in altitude and suddenly raise collective (usually people tend to max it out) because of that blade pitch angle change you suddenly have engines that need to work much harder to keep rotor RPM in ideal range and sometimes they can't. Basically you as a pilot need to keep your rotor RPM in check especially when doing maneuvers, if it starts dropping lower the collective and pitch nose down if you are in near hover, if you have some forward speed that is outside VRS range then simply lower collective a bit and you will instantly see rotor RPMs go up. Also if your throttle wasn't all the way up and you feel that heli is underpowered raise it or even max it out.
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