Are different fuel "types" modelled in the COD?

[Blackdog_kt]

Originally Posted by JG52Uther

I would guess that they modelled RAF planes with the 100 octane stuff as standard.

That would be my guess as well. However, i don't expect to see any groundbreaking performance gains when flying at high difficulty settings. Over-boosting the engine (war emergency power) was mostly done in two situations:

a) trying to catch a fleeing bandit who's faster than you
b) trying to escape, which means you've already screwed up and are on the defensive

Using it for any length of time on any aircraft will cause an overheat and if CoD's engine management is anything like the real thing, we can all forget pulling the throttle back briefly and then slamming it to the stops again, we'll probably have to fly by the book in higher difficulty settings.

The boost over-ride was not only usable with 100 octane, it was usable with lower octane fuel as well. The difference was how much more you could push the engine if you had 100 octane fuel, because higher octane fuel permits higher pressures in the engine.

To be honest, when flying with complex engine management enabled it would make minimal difference: anything above +6lbs or something like that is considered overboosting and will give you an overheat within a few minutes, regardless of fuel type. What's more, it could be a non reversible situation. The Spitfire had a pressure escape valve, so when the coolant would overheat and pressure in the coolant lines increased too much, it would be able to automatically reduce pressure and not break the lines by literally letting off some steam through the valve. However, this means that the coolant is escaping into the outside air, so the total amount of it is reduced and it's easier to overheat the second time, even easier the third and so on.

I don't know if Hurricanes and Me109s had a similar system, but seeing as they all used liquid cooled engines i wouldn't be surprised if they did.

The only tangible difference is that with 100 octane you might be able to push the engine to, for example, +14 lbs while the 87 octane fuel only permits +12 lbs and pushing any higher will cause detonation (engine knock) and irreversible damage. So, it's the available power that changes but it's still available for a very short amount of time.

Useful stuff at the top of a climb when you are in a "he who stalls first is dead" contest and in emergencies, but not something we will be able to run indefinitely like we can in the previous series of IL2.

[JG53Frankyboy]

sure, the CEM will hopefully more advanced in CoD than in IL2. And so the chance to ruin your engine might bee much higher !
BUT, even i real it was not an unimportant feature for a Spitfire/Hurricane Pilot to be able to push his Merlin to 12lb/sq.in. boost (what was only possible with 100octane fuel without further damage to the engine).
It gave a good amount of addtional speed and climb at least till 10.000ft (in a lot of typical servers i would call that high alt )

Here a sheet for a MerlinXII of the Spit II
http://www.spitfireperformance.com/spit2pnfs3.jpg

2-5min can be long in a fight

the Merlin III of the Mk.I Spits and Hurries dont differ much, they justr have a max 'normal' boost of 6 1/4 lb./sq.in. instead of 9 in the Merlin XII


increase boost with 100octane fuel
additional armour
CSPs
Radar
four points very important for the RAF to get its fightercommand ready to fight !

[fireship4]

Originally Posted by Blackdog_kt

The Spitfire had a pressure escape valve, so when the coolant would overheat and pressure in the coolant lines increased too much, it would be able to automatically reduce pressure and not break the lines by literally letting off some steam through the valve. However, this means that the coolant is escaping into the outside air, so the total amount of it is reduced and it's easier to overheat the second time, even easier the third and so on.

I would really like this and the fuel quality aspects to be modelled.

[TheGrunch]

Originally Posted by fireship4

I would really like this and the fuel quality aspects to be modelled.

+1...that must have been quite interesting to see, and might possibly have looked quite deceptive, particularly at high altitude (i.e. lower ambient air temperatures).

[PeterPanPan]

The new spitfire by A2A Simulations for FSX does.

See http://forum.1cpublishing.eu/showpos...24&postcount=1

[Blackdog_kt]

Originally Posted by JG53Frankyboy

2-5min can be long in a fight

That's very true. I'm just not sure if you even have 2 minutes

I obviously don't have any real life experience in a Spit. However, a buddy of mine flies a lot of FSX with 3rd party add-ons and i have some stick time in both the realair simulations Spitfire Mk.IX and the recently released A2A simulations Spit MkI/II addons.

My observations is that it also matters a lot how high your temps already are when you decide to go all out.

For example, if you are conservatively cruising along at low power and then go full throttle, you might get a full five minutes before the engine suffers damage and stops.
However, if you are already cruising at maximum continuous power for some time (which means that the temps are already just below overheat) like you would in a combat zone, you might have only a couple of minutes or less.

It sure makes combat much more dynamic and surprising, i hope most servers run with CEM enabled for the new sim

[T}{OR]

Very nice post Blackdog_kt, saved me from replying.