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FM/DM threads Everything about FM/DM in CoD

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  #21  
Old 04-19-2011, 08:36 PM
Viper2000 Viper2000 is offline
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If you're stuck in coarse pitch you just need to fly faster to get decent rpm.

Once you get to operational altitude (>15000') then you'll find that it's no problem to get full revs in coarse pitch because the air density is lower, the engine is putting out more power anyway (closer to FTH ~ 16000') and your TAS is higher.

So really this only matters if you want to get into slow turning fights on the deck. In which case you're going to get yourself killed pretty rapidly anyway . Actually it's probably quite a good learning tool because staying fast (say >200 mph IAS in 1940) is a very useful life skill.

Since there obviously won't be a fix until the next patch, and we don't yet know when that will be, don't forget that CEM isn't really that hard in a single seat fighter if you turn off overheating, especially if you don't have to fly for range; you just leave the mixture in rich, control rpm with the prop control and boost with the throttle. Trying, crashing, burning and learning is probably preferable to being grounded until the fix.

When you want more power, first increase rpm/go to fine pitch and then open the throttle.

If you've got a 2 position prop then remember your rpm limit, and don't change up if you're less than say 300 rpm below it (i.e. don't go into fine pitch in a Spitfire if you're getting more than about 2700 rpm in coarse pitch).

When you want less power, close the throttle first and then reduce rpm/go to coarse pitch.

[Actually it's not even that hard with overheating on because if in doubt you just open the radiator and accept the (relatively small) drag penalty.]
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  #22  
Old 04-20-2011, 05:23 PM
Orpheus Orpheus is offline
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Quote:
Originally Posted by SdS49r View Post
This is a Bug that needs to be addressed RIGHT AWAY. The hurricane flys great in the GB campaign but the spitfire is a dog. If the hurricane flys great without CEM then the spitfire should also. That seems pretty simple to me.
Why all this talk about CEM, prop pitch, rpms and engine management?? Seems like quite a few comments above just don't get it! It's broken and needs to be fixed. If not then the majority of us cannot complete the GB campaign. Am I right?
Yes, quite right.

@ Viper - thanks for the info. Until this is patched we seem to have no choice but to use CEM if we want to continue playing the GB campaign, as the Spit is virtually unusable in its current state. Really hope someone from the dev team notices this.

As for me, I'm giving up, for now at least. There have simply been too many problems with this game since release. The last patch made the game playable (after however many weeks of waiting, ffs), and to fire up the campaign (which I've been really looking forward to) and discover yet another game breaking bug in something so obvious as the main campaign is just too much. Until this is fixed, there's no point carrying on.
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  #23  
Old 04-20-2011, 05:40 PM
mattag08 mattag08 is offline
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I don't see what the problem is. While Coarse pitch is supposed to be for cruising, I just run fine pitch all the time with the radiator opened about 50% and no issues whatsoever. If anything needs correcting its the mixture control, it's completely broken. Auto-mix doesn't work above 10k ft and auto-weak just causes the engine to cut regardless of flight parameters.
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  #24  
Old 04-20-2011, 08:00 PM
Orpheus Orpheus is offline
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Quote:
Originally Posted by mattag08 View Post
I don't see what the problem is. While Coarse pitch is supposed to be for cruising, I just run fine pitch all the time with the radiator opened about 50% and no issues whatsoever. If anything needs correcting its the mixture control, it's completely broken. Auto-mix doesn't work above 10k ft and auto-weak just causes the engine to cut regardless of flight parameters.
We're not talking about the engine cutting out. We're talking about the fact that the Spitfire given to the player in the campaign cannot catch up with large bombers, or in fact anything moving faster than a milk-float. I've literally had a level flight, full throttle top speed of 120kph on some occasions, with no damage whatsoever. After take off, the CEM does something to the airspeed, reducing it dramatically - you can even hear the engine wind down once you're in the air.

The problem - since this seems to need restating - is that without using CEM, which not all players are comfortable with, the SP campaign becomes unplayable once you move to a Spitfire. While I appreciate the response/advice, the simple fact is that I do not WANT to use CEM, and I shouldn't have to in order to get usable performance out of the Spitfire. This problem breaks the campaign (and use of the Spitfire in general) for non CEM users and needs to be addressed in the next patch.

Maybe this needs a new thread entirely, one focused on the broken campaign issue, rather than Spitfire flight mechanics. It might get the issue noticed and prevent the offering of 'solutions' that involve using CEM.

Last edited by Orpheus; 04-20-2011 at 08:07 PM.
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  #25  
Old 04-20-2011, 11:06 PM
Viper2000 Viper2000 is offline
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Quote:
Originally Posted by Orpheus View Post
The problem - since this seems to need restating - is that without using CEM, which not all players are comfortable with, the SP campaign becomes unplayable once you move to a Spitfire. While I appreciate the response/advice, the simple fact is that I do not WANT to use CEM, and I shouldn't have to in order to get usable performance out of the Spitfire. This problem breaks the campaign (and use of the Spitfire in general) for non CEM users and needs to be addressed in the next patch.

Maybe this needs a new thread entirely, one focused on the broken campaign issue, rather than Spitfire flight mechanics. It might get the issue noticed and prevent the offering of 'solutions' that involve using CEM.
I just tested this with CEM and overheating off in a Spitfire I. There is no bug.

You takeoff in fine pitch. After a short delay, Santa's little helper then puts the prop into coarse, and leaves it there for the rest of the sortie.

(In fact, if you land, the second you have weight on the wheels your little helper will even put the prop back into fine pitch for you so that you can takeoff again.)

The only difference between what I do with CEM on and what the helper does with CEM off is that if I end up getting slow then I might put the prop into fine pitch in flight. This is most helpful at low level due to the high air density; at operating altitudes above about 15000' you get quite a lot of revs in coarse anyway so the benefits are less and the risk of overspeeding is greater. I'd also put it into fine to help me slow down for landing, and to facilitate going around should it become necessary to reject the approach.

But I also might break my engine, so you pays your money and you takes your choice. You can't really have your cake and eat it with this stuff.

As far as performance goes, the aeroplane does what you'd expect it to do.

I was easily able to get to 260 mph IAS on the deck with full throttle but without the boost cutout. It takes a while, but that's the nature of the beast.

Climbing at 180 mph IAS I get about 2000 fpm.

Flat out at 17000' I get 270 mph IAS ~ 350 mph TAS.

At the end of the day, it's a Spitfire, not an F-22.

It's very pretty, but it isn't magic. If you don't fly it properly then it won't perform, irrespective of CEM. If I fly at the correct airspeeds then it performs well; If I don't then it doesn't.

Just be thankful that you can fly at 17000' without constant backfiring caused by a real bug.

BTW, in other news Spitfire IIa is a lot faster with CEM off because you're getting 3000 rpm the whole time; I can get about 295 mph IAS flat out at 17000', which is getting on for 380 mph TAS; rather faster than I would expect.
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  #26  
Old 04-21-2011, 03:17 AM
Orpheus Orpheus is offline
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Viper - saw your post and went off to test it. You're right about it changing the propellor pitch - I see the RPM drop from 2900 on takeoff to around 2400 at about 1200 feet and stay there, and after that the Spitfire accelerates/climbs like an absolute pig. I'm getting climb rates of around 110 mph, not 170, though that is low level after takeoff.

It's the difference between the two that's most startling. I tested the same in a Hurricane at 2000 ft and was getting a climb speed of around 170, rpm again in the 2900 region. Is this really just a quirk of the aircraft, or am I just flying it like a pillock? I had no trouble at all in the Hurricane, I assume because it doesn't have the variable prop?

Thanks for taking the time to check for me anyway. I realise I've repeated the same circular argument that the op began with, although I guess I now have a clearer understanding of the way the engines operate.

Last edited by Orpheus; 04-21-2011 at 03:22 AM.
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  #27  
Old 04-21-2011, 02:19 PM
Viper2000 Viper2000 is offline
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Quote:
Originally Posted by Orpheus View Post
Viper - saw your post and went off to test it. You're right about it changing the propellor pitch - I see the RPM drop from 2900 on takeoff to around 2400 at about 1200 feet and stay there, and after that the Spitfire accelerates/climbs like an absolute pig. I'm getting climb rates of around 110 mph, not 170, though that is low level after takeoff.
Set full power.

Takeoff.

Clean up.

Then just stay in level flight until you're flying at 180-190 mph.

Now trim the aeroplane for constant IAS.

You should see a rate of climb just under 2000 fpm, which will improve as you get higher and the engine rpm increases.

If you're flying at 110 mph then you're doing it wrong; you've got loads of induced drag and performance will be terrible. Indeed, at full power if you pitch to 80 mph you'll find that it can't either climb or accelerate, because all the power is going into making turbulence.

The only time you should ever fly a Spitfire slower than about 170 mph IAS is for takeoff and landing.
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  #28  
Old 04-21-2011, 02:44 PM
Orpheus Orpheus is offline
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Quote:
Originally Posted by Viper2000 View Post
Set full power.

Takeoff.

Clean up.

Then just stay in level flight until you're flying at 180-190 mph.

Now trim the aeroplane for constant IAS.

You should see a rate of climb just under 2000 fpm, which will improve as you get higher and the engine rpm increases.

If you're flying at 110 mph then you're doing it wrong; you've got loads of induced drag and performance will be terrible. Indeed, at full power if you pitch to 80 mph you'll find that it can't either climb or accelerate, because all the power is going into making turbulence.

The only time you should ever fly a Spitfire slower than about 170 mph IAS is for takeoff and landing.
Heh, yeah - you're right. Was up surprisingly late last night flying the spit in the GB campaign. I'm very new to these games but I do see it now. Not sure what IAS stands for, I assume something AirSpeed (but then I have trouble trimming to level flight in any single engine it seems, I can keep the nose down with the elevator trim but never overcome the pull to the right with rudder trim). At higher altitudes it's a different beast entirely, much faster acceleration overall.

Appreciate you taking the time to talk me through it. I knew when I bought this game it was going to have a deep flight model... just didn't expect the two planes to be so different! Only thing that's confusing me now is that said campaign spitfire doesn't seem to have tracers... or indeed any visible indication of bullet strike on enemy aircraft (or water, for that matter) at even the closest range - though I still get the 'player damage 98%' at the end of the mission, so I am hitting! Free flight spits have the tracers and bullet strike is obvious even at long ranges, so maybe it's just a bug?

Last edited by Orpheus; 04-21-2011 at 02:50 PM.
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  #29  
Old 04-21-2011, 03:00 PM
jimbop jimbop is offline
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Indicated Air Speed. There's a good explanation of IAS vs True Air Speed in the manual.
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  #30  
Old 04-21-2011, 03:01 PM
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robtek robtek is offline
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No, imho it is just a different ammo-loadout with no tracers as the experts used.
No need to advise your enemy that you are sitting in his six and did miss him with the first burst.
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