zerO_crash Posted February 20, 2016 Posted February 20, 2016 Played a mission recently where the temperature was set to -40 C degrees and couldn`t get the engine running. APU shows rather low EGT temp of 450C degrees. Obviously it won`t start my engine from there, as it`s simply too cold. Back in 1.5.1 and before that, you could start in -50C (with or without ground power). Are there any specific changes in this department? Manual and other technical info I got show no mention of the helicopter not being able to start with such low temperatures.... Edit: Even more funny that a Huey can start in -50C with ground power, whilst Ka50 and Mi8mtv2 can`t.... [sIGPIC][/sIGPIC]
BaD CrC Posted February 20, 2016 Posted February 20, 2016 Interresting. I suppsose the park group is not helping either? It s been a while since low temp operations is preventing to start apu, but i have never tried such a low temperature. https://www.blacksharkden.com http://discord.gg/blacksharkden
zerO_crash Posted February 20, 2016 Author Posted February 20, 2016 Well, tried pretty much anything and no luck. 99% sure it`s a glitch. The lowest temperature that it will let me start the engine at is -35C and that barely. Russian helicopters are built to withstand diametrically opposing climates, and this is no exception. I do realize that the -60C operation temp is indeed a temperature it will operate at once started, and that is correct with my sources. But for -50C startup there should be no problems really. (I do know that they heat up the engines with other equipment anyways IRL, but still. No operative requirement says less than -50C...) I notice it`s with the APU, it simply doesn`t reach the temperature it`s supposed to. [sIGPIC][/sIGPIC]
msalama Posted February 20, 2016 Posted February 20, 2016 I notice it`s with the APU, it simply doesn`t reach the temperature it`s supposed to. Hmmm... interesting. It's a (wee turbine) engine - and as such, should reach its operating temperature after a short while regardless of the OAT, right? Smells like bug to me at least! The DCS Mi-8MTV2. The best aviational BBW experience you could ever dream of.
zerO_crash Posted February 20, 2016 Author Posted February 20, 2016 That is correct [sIGPIC][/sIGPIC]
Flagrum Posted February 21, 2016 Posted February 21, 2016 wikipedia says, jet fuel has a melting poing of somewhere between -60 °C and -26 °C (english version states −47 °C ) That might play a role here?
msalama Posted February 21, 2016 Posted February 21, 2016 (edited) That might play a role here? I was about to reply that it shouldn't, but am frankly speaking not so sure anymore. See https://en.wikipedia.org/wiki/Jet_fuel and observe how the freezing points are actually kind of high. Are, say, jetliner fuel tanks heated at altitude - guess not because of the lowish fuel flash point? Edited February 21, 2016 by msalama The DCS Mi-8MTV2. The best aviational BBW experience you could ever dream of.
zerO_crash Posted February 21, 2016 Author Posted February 21, 2016 For military jet fuel, Kerosene, you add an anti-freeze agent (some type of alcohol) to prevent the fuel from freezing in cold conditions by increasing boiling point and decreasing freezing point (expansion both ways on the temp scale for fuel`s properties). It worked, see for example what temperatures the Mig21/25`s were flying at sometimes, mainly those that were stationed around the Siberia region. I highly doubt it`s got to do with the fuel. Both the Mi8 and Ka50 APU struggle to get up in temperature, and that`s really where the root of the problem lies, if you ask me. [sIGPIC][/sIGPIC]
msalama Posted February 21, 2016 Posted February 21, 2016 anti-freeze agent (some type of alcohol) Ah, of course, just as you do with all liquid transport fuels actually :thumbup: But anyway, I concur - has got to be a bug... The DCS Mi-8MTV2. The best aviational BBW experience you could ever dream of.
zerO_crash Posted February 21, 2016 Author Posted February 21, 2016 Will admit that Civil aviation isn`t my strongest side, so nice to know that :thumbup: [sIGPIC][/sIGPIC]
zerO_crash Posted April 26, 2016 Author Posted April 26, 2016 So seems like you can start her currently at -40C, but it still seems kinda funny that a UH-1H has permitted startup temp. of -54C; https://books.google.no/books?id=hHg-AAAAYAAJ&pg=PA176&lpg=PA176&dq=uh-1h+startup+ambient+temperature&source=bl&ots=PLYR-I6jQj&sig=kfz81TGpDKVx-4wvlhIY9786ih0&hl=no&sa=X&redir_esc=y#v=onepage&q=uh-1h%20startup%20ambient%20temperature&f=false whilst, Ka50 struggles with -40. Is this really true? Been flying all these years and able to do -50c without any problems really, whilst now it suddenly is... Can anyone from ED actually give me an indication of what to make out of this? Sources are welcomed. [sIGPIC][/sIGPIC]
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