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FM/DM threads Everything about FM/DM in CoD |
View Poll Results: Are the incorrect British FM killing the enjoyment of the game? | |||
Yes |
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107 | 55.15% |
No |
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48 | 24.74% |
Not bothered. |
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39 | 20.10% |
Voters: 194. You may not vote on this poll |
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#1
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Laughable.
NZtyphoon and his friends feel personally attacked, so they decide to bring out some 110 documents to "fight back" or "show them" or something. ![]() ![]() ![]() ![]() Talk about emotional investment. It's so blatantly obvious that I really can't help but laugh. Start a different thread on the 110 if you like. Nobody feels threatened. If the data supports it I will happily lobby 1c for appropriate changes. I suspect that certain people here will continue to lobby for the changes they want (or to prevent the spitfire from being more realistic), regardless of whether or not the data supports them. When they are exposed as having no basis in fact, they will troll, spam and argue until the thread gets locked, just like they did the last time. It's actually rather sad. This community really is one of the worst communities I've ever had the misfortune of being part of. Last edited by CaptainDoggles; 08-26-2012 at 04:25 AM. |
#2
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This is from Sydney Camm and the Hurricane describing the difference made when the Merlin changed from 100% glycol to 30% Glycol, 70% H20
![]() the lower operating temperature of the engine on this mix - also used by the Merlin XII - helped TBO and reliability. In theory the CLOD Merlin XII should not be overheating as much as it is right now. I'm not sure about the temperature difference of 70°C as quoted so I'll dig a little more. Last edited by NZtyphoon; 08-26-2012 at 05:11 AM. Reason: Add url |
#3
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Engine temperatures are a function of coolant capacity, coolant type, coolant circulation capacity and heat transfer capacity of the radiators. The amount of pressurization the cooling system also raises the boiling point. What was the coolant capacity of the Spit and Hurri Mark Is, how many gallons/liters? Are there any cooling trials available for these aircraft?
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Il-2Bugtracker: Feature #200: Missing 100 octane subtypes of Bf 109E and Bf 110C http://www.il2bugtracker.com/issues/200 Il-2Bugtracker: Bug #415: Spitfire Mk I, Ia, and Mk II: Stability and Control http://www.il2bugtracker.com/issues/415 Kurfürst - Your resource site on Bf 109 performance! http://kurfurst.org ![]() |
#4
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#5
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So say with a pure glycol coolant 140 degrees celsius may indicate that the engine compontents are about (iirc) 400 celsius, while when using pure water 90 degrees may indicate the very same, since water has a much higher heat transfer capacity (its more effective at carrying away heat). I suppose they changed the coolant agent type to water-glycol mixture on later Merlins because they realised glycol alone simply cannot transfer heat fast enough, and by adding 70% water this increased greatly. This was usually the practice anyway, an 50-50 or 70/30 mix was generally used by everyone. The DB 601A had used 47% water, 50% glycol and 3% mixture of lubrication oil and water (1:2), which may explain why the DB powered planes do not overheat so easily compared the the all-glycol cooled Spitfire Mark I / Hurricane Mark I. Coolant circulation may be also of important - the DB 601A circulated coolant for example at 65 000 liter / hour rate. Glycol permitted higher coolant temperatures without the mix boiling away, and was an anti freeze too for higher altitudes (where temperatures can be easily at the -40 degrees celsius range).
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Il-2Bugtracker: Feature #200: Missing 100 octane subtypes of Bf 109E and Bf 110C http://www.il2bugtracker.com/issues/200 Il-2Bugtracker: Bug #415: Spitfire Mk I, Ia, and Mk II: Stability and Control http://www.il2bugtracker.com/issues/415 Kurfürst - Your resource site on Bf 109 performance! http://kurfurst.org ![]() |
#6
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A second problem is that in its pure form Ethylene glycol is flammable, thus it was a hazard to use 100% glycol in combat aircraft. The Merlin II and III series had a normal coolant temperature of 90°, and 120°C emergency maximum - close to the flash point of glycol http://www.npi.gov.au/substances/eth...col/index.html Mixing glycol with water increases the flash point while preserving the anti-freeze, anti-corrosive properties of glycol. Thus the Merlin XII and XX series (30% Glycol, 70% water) were able to run at higher temperatures 105° normal to 125° for climb, 1 hr maximum and 135° +12 lbs boost 5 minutes while the vulnerable gaskets and oil seals were less prone to failure. I don't know why the British adopted 100% glycol, although I remember reading about it somewhere. |
#7
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Hurricane ~15 gallons, was tested in a climb with 2600rpm/6.25lb boost, result is that in English summer conditions (25°C at sea level) it can do this without overheating (oil & glycol).
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