Friday 2010-12-10 Dev. video update and Discussion

[swiss]

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[Flanker35M]

S!

If comparing Spitfire Mk.I/Hurricane early marks and Bf109E-4 it can be easily seen that the Spitfire/Hurricane have longer exhaust pipes than Messerschmitt. I recall reading the exhausts on a DB engine were very short, in range of 10-15cm only.

[BadAim]

Originally Posted by Flanker35M

S!

Thank you for the update Nice to see things shaping up. In that DB605 video you can see the root of the flame has reddish/yellow but the tip of it is blueish. Could the British and German difference be that Brits and other allies had carburettors and Germans had direct fuel injection in their DB/Jumo/BMW engines. The mixture in a fuel injected engine, like DB-series, is better than in a carburettor engine and high pressure spray of fuel gives more even fill of the cylinder at the right time compared to the suction in a carburettor system.

Also many nightfighter books I have read state blueish flames on British bombers. And there was a talk witha guy who tuned/maintained DB engines and he said the engine tunes were done in a dark room to see the exhaust flame color to adjust the injection etc. correctly.

Ok, have a good weekend all!

Don't forget that in the Daimler video, (as far as it seems to me) they were starting the engine for the first time, so they went straight into a "break in run" at a much higher than Idle RPM. (it's been a long time since I've built an engine, but I think I'd typically "run in" a chevy big block at about 2000 RPM for about 15 minutes) That kind of RPM will of course produce a hotter flame than a typical start to idle of an already broken in engine. This will also (as Oleg pointed out ) explain the difference between the flame seen at start up and in flight.

[BadAim]

Big LOLs. Oleg sure has his work cut out for him. I'd not be surprised if this thread doesn't cure him from appeals to us for help!

[JAMF]

Mr. Maddox, a quick question on last weeks update; Was the map in the FMB a temporary version, or does the SoW map have structures from after the war? (Like the Basin de L'Atlantique at Gravelines, WSW of Dunkerque?)

Bear in mind that the Luftwaffe used effective flame dampeners. After extensive training in identifying flame patterns an American pilot said he never saw flames due to the dampeners but the training did help him separate Luftwaffe flights from Allied.

[Flanker35M]

S!

I doubt they would run up the DB engine above idle as the manual for it states you have to wait until oil/fuel pressure exceed a certain limit. The idle RPM for DB605A-1 is 600-700rpm and in the video the RPM was not high IMO. But good points BadAim. Anyway in above videos can be clearly seen blue flames instead of yellow. I would bet the yellow would come if the mixture was way too rich or unburned fuel in the cylinders when firing up. Well, let's see..Also note that the blue flame did not light up the plane as much as in SoW video.

[Towarisch]

GREAT , GREAT , Pictures and this in motion.

Thank you so much for this great Friday update. With every Friday evenning beats our hearts a little bit more for this great Game

I think we all wish you, your famaly and your team too.. a nice peacefull christmastime and a happy new year 2011.

Thank you Mr. Oleg


with regards from Old Germany

[Solnyshko]

Re exhaust stacks; my understanding is that it was the cooling pipes that glowed red, and it was this 'hot metal' and not the flame which was visible from a distance - especially relevant in night fighting.

[T}{OR]

Lovely update. Love the individual cylinder firing. Shame early Spits have cylinder exhausts in pairs, I love to see them firing in proper firing order accompanied with the exhaust flames, faster and faster as RPM grow. Out of all all in-line engines, nothing beats the magnificent, almost perfectly balanced V12.

As for the flames, I too would like to see them more 'on the blue side'. However, as you have said it all depends on the fuel quality, which is nowhere near when compared with what we have nowadays. Definitely a mix of yellow/orange and blue burnout...