DieHard Posted July 5, 2015 Posted July 5, 2015 Does the Mi-8 Throttle Up / Down (RCtrl+Home or RCtrl+End) function similar as the Huey's Emergency Governor does for emergency power, increase rotor RPMs when needed? How much use does the Mi-8's Throttles get used during flight? Deciding the need to map buttons for this function. [sIGPIC][/sIGPIC]
Nevyn Posted July 5, 2015 Posted July 5, 2015 Not sure I understand what you mean but I will have a go anyway, I never touch the throttle during flight. Not sure about the emergency thingy.
Cibit Posted July 5, 2015 Posted July 5, 2015 Very rare I touch the throttle once it is set and engines are running normally. Afaik it has no governor like the huey i5 8600k@5.2Ghz, Asus Prime A Z370, 32Gb DDR4 3000, GTX1080 SC, Oculus Rift CV1, Modded TM Warthog Modded X52 Collective, Jetseat, W10 Pro 64 [sIGPIC][/sIGPIC] Adding JTAC Guide //My Vid's//229th AHB
EagleFox Posted July 5, 2015 Posted July 5, 2015 ofc it has governor. Mi8 also have in case of emergency if governor fails 2 leveres right from pilot's collective. Those are for to manually manage throtle.
Art-J Posted July 5, 2015 Posted July 5, 2015 It has governor, and, as a result, You only need to touch the throttle twice per flight - after startup and before the shutdown (in normal circumstances). I don't recall any emergency regimes in it though. i7 9700K @ stock speed, single GTX1070, 32 gigs of RAM, TH Warthog, MFG Crosswind, Win10.
AlphaOneSix Posted July 5, 2015 Posted July 5, 2015 (edited) Does the Mi-8 Throttle Up / Down function similar as the Huey's Emergency Governor does for emergency power, increase rotor RPMs when needed? No. How much use does the Mi-8's Throttles get used during flight? None*. *Okay there is one time. When practicing autorotations, the throttle is rolled to idle in-flight to simulate a dual engine failure. The throttle is brought back to full right at the completion of the autorotation, hopefully well before contacting the ground. Edited July 5, 2015 by AlphaOneSix
EagleFox Posted July 5, 2015 Posted July 5, 2015 Alphaonesix on which variant of Mi-8 are you performing autorotations. Throttle down the mtv isn't good idea. The generators are powered by the engines not by the reductor like in old Mi-8. I recall my father saying that there is some button that detaches reductor off the engine so the generators are still runnin
GunfighterSIX Posted July 6, 2015 Posted July 6, 2015 (edited) The main generators are turned by the transmission which is turned by the engines or the main rotor. If you have a dual engine failure you will not have a power loss unless you droop the rotor, because in an auto rotation the blades keep spinning. MI-17MTV manual 2-49 Transmission “Two AC generators, two rotortachgenerators, two hydraulic pumps, and an air compressor are mounted on and driven by the transmission.” 2-17 Engines “The rear output shafts of the engines are connected, via a uniball coupling, to the main transmission, which transmits power to the main rotor, AC generators, tail rotor, and accessories.” I hope the Russians were not stupid enough to build a variant with the generators running off the engines. Edited July 6, 2015 by GunfighterSIX HHC, 229th AHB, 1st Cav Div http://1stcavdiv.conceptbb.com/
EagleFox Posted July 6, 2015 Posted July 6, 2015 hmm so i thought that there is no big difference in between mtv1 and mtv2. Looks like ther is. And yes they have built the generators powered off the engines in mtv1
AlphaOneSix Posted July 6, 2015 Posted July 6, 2015 (edited) There is no difference (regarding the powertrain) between the MTV1 and MTV2. Perhaps you are referring to the older TV2-117 powered Mi-8's, which had starter-generators mounted on the engines. EDIT: Alright, now that I have my ducks in a row... All Mi-8/17 helicopters with the TV3-117 engines have air starters on the engines that are started with bleed air from the APU. Electrical power in flight is provided by two AC generators mounted on the main gearbox (and from there it is transformed/rectified for all aircraft systems). The Mi-8MTV-1 and Mi-8MTV-2 are both powered by TV3-117 engines. Older Mi-8 helicopters equipped with TV2-117 engines had starter-generators mounted on the engines instead of an air starter. The engines are started by battery power through the starter-generators. In flight, DC power for the helicopter is provided by the two engine-mounted starter generators, and AC power is provided by a single AC generator mounted on the main gearbox. The main helicopters in this family are the Mi-8T and Mi-8P. Edited July 6, 2015 by AlphaOneSix
Cibit Posted July 6, 2015 Posted July 6, 2015 Very rare I touch the throttle once it is set and engines are running normally. Afaik it has no governor like the huey ofc it has governor. Mi8 also have in case of emergency if governor fails 2 leveres right from pilot's collective. Those are for to manually manage throtle. Note the "like a huey" I will take AlphaOneSix answer as being right i5 8600k@5.2Ghz, Asus Prime A Z370, 32Gb DDR4 3000, GTX1080 SC, Oculus Rift CV1, Modded TM Warthog Modded X52 Collective, Jetseat, W10 Pro 64 [sIGPIC][/sIGPIC] Adding JTAC Guide //My Vid's//229th AHB
GunfighterSIX Posted July 6, 2015 Posted July 6, 2015 Thanks for all the info AlphaOneSix! I don't have any manuals for versions older than MTV'S. And it's interesting learning about the progression of aircraft that have long service lifes, such as the Mi8. HHC, 229th AHB, 1st Cav Div http://1stcavdiv.conceptbb.com/
DieHard Posted July 11, 2015 Author Posted July 11, 2015 ofc it has governor. Mi8 also have in case of emergency if governor fails 2 leveres right from pilot's collective. Those are for to manually manage throtle. Yes, I see the two governor switches on the AP center console. Thanks to all for the replies concerning my question. [sIGPIC][/sIGPIC]
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