IvanK Posted January 17, 2009 Posted January 17, 2009 What criteria does EKRAN/BS use to generate the Rotor Ice caution ? Is it actually an ice detetection system or is it simply based on temperature ?
Axel40 Posted January 17, 2009 Posted January 17, 2009 No idea but it bugs me when it yells at me to use it when it's already on. BUG?
Boberro Posted January 17, 2009 Posted January 17, 2009 Conditions AFAIK are from -5 up to -20 degrees plus moisture. Reminder: Fighter pilots make movies. Bomber pilots make... HISTORY! :D | Also to be remembered: FRENCH TANKS HAVE ONE GEAR FORWARD AND FIVE BACKWARD :D ಠ_ಠ ツ
IvanK Posted January 17, 2009 Author Posted January 17, 2009 Ok and what defines "moisture" in game ? ... I get regularly in sky clear conditions..... I thionk perhaps it is just hard wired to OAT.
nemises Posted January 17, 2009 Posted January 17, 2009 There was an excellent discssion on it by the Devs a few months back...you will need to search it out, but it came down to a static table of air temperature / air pressure (which derives moisture content / altitude). as temperature and air pressure and therefore moisture is static over the map, the only real variables are whatever temperature the mission designer has set, and whatever altitude the pilot is flying at. No idea but it bugs me when it yells at me to use it when it's already on. BUG? As for this...the EKRAN warning comes on whenever it detects icing ... it doesn't know (or care) if your anti icing is on or not. Anti icing is unlikely to be 100% efficient , so if you are getting ice on your rotors, then the EKRAN will tell you about it. If your anti icing is on, then great, good for you :) :)
Legolasindar Posted January 17, 2009 Posted January 17, 2009 In my case, EKRAN alert my activate deICE Rotor and engine. Activate both and deICE for rotor continue alerte me, and continue and continue... is crazy :) [sIGPIC][/sIGPIC] Cavallers del Cel - Comunintat Catalana de Simulació http://www.cavallersdelcel.cat
Axel40 Posted January 17, 2009 Posted January 17, 2009 In my case, EKRAN alert my activate deICE Rotor and engine. Activate both and deICE for rotor continue alerte me, and continue and continue... is crazy :) That's what I mean :lol:
Frederf Posted January 17, 2009 Posted January 17, 2009 The alert should remain active for as long as you are in icing conditions but only warn you once audibly. The aircraft doesn't detect icing directly though, only that you are in icing conditions. The first few times I only activated the rotor anti-ice and after a few minutes I fell out of the sky. Now I activate the engine anti-ice and I keep the pitot/static heaters on the whole time.
IvanK Posted January 17, 2009 Author Posted January 17, 2009 Thanks I will go looking .... however without visible moisture I find it strange that any icing would occur. Temp v pressure alone does not in itself determine atmospheric moisture content. If I was in cloud or mist then yep I would agree. There was an excellent discssion on it by the Devs a few months back...you will need to search it out, but it came down to a static table of air temperature / air pressure (which derives moisture content / altitude). as temperature and air pressure and therefore moisture is static over the map, the only real variables are whatever temperature the mission designer has set, and whatever altitude the pilot is flying at. As for this...the EKRAN warning comes on whenever it detects icing ... it doesn't know (or care) if your anti icing is on or not. Anti icing is unlikely to be 100% efficient , so if you are getting ice on your rotors, then the EKRAN will tell you about it. If your anti icing is on, then great, good for you :) :)
Frederf Posted January 17, 2009 Posted January 17, 2009 Icing needs moisture, not just visible moisture. The ambient pressure is not the same as the pressure at various points around the rotors or at the engine inlets. I know one of the most dangerous situations for Cessna 172 carburetor ice is at 70F even in clear air. Hot air can hold a lot more moisture than cold air. Moreover the aircraft doesn't know if you're in a cloud or not so it's going to give you that warning based on what it knows. Ultimately it's up to the pilot to decide.
IvanK Posted January 17, 2009 Author Posted January 17, 2009 Carby icing is fundamentally different to Rotor/Airframe icing though. Good ice detection systems are certified in some types to automatically turn on Eng Inlet Anti ice etc. In other Jet types a combination of SAT/TAT and power setting (i.e bleed availabilty) and visible moisture is used as criteria to turn on Eng Anti ice. I don't know of any commercial jet that requires engine anti ice turned on in the absence of visible moisture. I guess the thing with BS is it just reminding you that you are in the Temp range where icing may be a problem. However the chances of picking up either Rotor or Engine inlet icing in clear air are pretty remote.
EvilBivol-1 Posted January 18, 2009 Posted January 18, 2009 (edited) http://forums.eagle.ru/showpost.php?p=578783&postcount=32 Actual Ka-50 manual says that anti-ice systems must be on anytime "the temperature is lower than +5C OR there are icing conditions (rain, moisture, fog, etc)." Edited January 18, 2009 by EvilBivol-1 - EB [sIGPIC][/sIGPIC] Nothing is easy. Everything takes much longer. The Parable of Jane's A-10 Forum Rules
IvanK Posted January 19, 2009 Author Posted January 19, 2009 Ok fair enough. if thats the manufacturers recommendation
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