+12 boost

[ICDP]

This has been gone over a few times Reflected and I disagree, we do not have 1939 planes, in some cases they are much worse. Though the Spitfire Mk IIa is giving +12 lbs boost speeds even with +9 lbs boost showing on the guages.

Another link where some of the community are testing the AC performance.

http://forum.1cpublishing.eu/showthread.php?t=20196

[Peril]

http://forum.1cpublishing.eu/showthread.php?t=20110

[reflected]

Sorry, I must have missed the threads, and haven't read any official feedback on the issue. So, is it being looked at?

[ICDP]

It is easy to miss the pertinent threads among the others. I believe the devs are looking into high alt FM/CEM issues and would hope they are going to fix these issues also.

[Blackdog_kt]

Just as a side note, i don't think the instruments were calibrated for the extra amount of power, at least not early on in the war.

Boost cut-out probably started as an over-ride in case the automatic boost control failed, then pilots discovered it could be used to over-boost the engine. As such, it went from a backup system that was supposed to be used to maintain boost in normal operating range in case of malfunction, to a war emergency type system and instrumentation had some catching up to do. Viper2000 explains it in much more detail, possibly in the threads you guys linked.

As for the 100 octane issue and boost values, i agree it should be corrected but if the CEM is also realistic it will be of minimal tactical value. I mean, what is a minute or less (depending on the engine's temperature at the start of WEP usage) of running +12 psi boost before it gets damaged in the grand scheme of things during a sortie? If people think we'll be able to cruise around at those values they will be sorely disappointed.

Such power settings are more like what you would use when you see a 109's cannons "blinking" in your direction to command extra power for a maximum G evasive maneuver or to accelerate better, ie as a backup for when you've already put yourself in a place that you've probably lost the fight. It certainly doesn't represent any kind of sustainable power setting if it blows the engine to bits within minutes, it's just an "oh sh*t, let's get out of here" helper

[Kwiatek]

It wouldnt be minimal effect Blackdog when using higher boost. At low alt it would be huge difference beacuse it give 300 HP more to engine for MErlin III. It could be used for 3-5 minutes and it make big difference in speed and climb. It has no effect at higher alts thought.


For 109 E-3 emergency power 1.45 Ata ( 1.4 Ata for 601A) was allowed only for 1 mminut so it was very short time to use, also 1.35 Ata was also only allowed for 5 mintues - so its mean that both 1.45 Ata and 1.35 in 109 was seriously restricted by time - much more then in Merlin. Of course it was only for low to medium alts. At higher alts such boost pressure wasnt possible to achive due to lack of supercharger power.

[Blackdog_kt]

Originally Posted by Kwiatek

It wouldnt be minimal effect Blackdog when using higher boost. At low alt it would be huge difference beacuse it give 300 HP more to engine for MErlin III. It could be used for 3-5 minutes and it make big difference in speed and climb. It has no effect at higher alts thought.


For 109 E-3 emergency power 1.45 Ata ( 1.4 Ata for 601A) was allowed only for 1 mminut so it was very short time to use, also 1.35 Ata was also only allowed for 5 mintues - so its mean that both 1.45 Ata and 1.35 in 109 was seriously restricted by time - much more then in Merlin. Of course it was only for low to medium alts. At higher alts such boost pressure wasnt possible to achive due to lack of supercharger power.

All i'm saying is that it's not IL2:1946 anymore where we can run with 110%+WEP by opening radiators every 5 minutes and lowering prop pitch because the overheat is directly tied to RPM. In the new sim there are limits and as such, WEP really means emergency power and can't be used all day long like it was in IL2:1946.

Sure, 12lb boost could save your virtual life a few times. It's just not something you can run for the entire mission if you fly at full difficulty and that's good, because that's the way it worked in reality as well.

I would still like it to get fixed and accurate according to historical data, i just don't expect any massive advantage for being able to run it for a couple of minutes during a 60 minute sortie.

[*Buzzsaw*]

Originally Posted by ICDP

This has been gone over a few times Reflected and I disagree, we do not have 1939 planes, in some cases they are much worse. Though the Spitfire Mk IIa is giving +12 lbs boost speeds even with +9 lbs boost showing on the guages.

Another link where some of the community are testing the AC performance.

http://forum.1cpublishing.eu/showthread.php?t=20196

Wrong. The Spit II has lower performance than an aircraft at +8.8 boost:



Image courtesy of Mike Williams Spitifire Performance site:

http://www.spitfireperformance.com/spittest.html

[Kwiatek]

Originally Posted by *Buzzsaw*

Wrong. The Spit II has lower performance than an aircraft at +8.8 boost:



Image courtesy of Mike Williams Spitifire Performance site:

http://www.spitfireperformance.com/spittest.html

If you give more focus on both test - Spitfire MK1 and MKII you will note thath MK II was equimpment with aditional pilot armour ( was more heavy) and MK1 has only armoured windscreen ( without pilot armour). Thats why at higher alts above 18 000 ft where boost preasure for both engines - Merlin III and Merlin XII was similar Spitfire MK1 with lower weight was faster. At lower alts MKII at nominal power ( +9lbs) was faster then MKI ( + 6 1/2 lbs) but at emergency power +12 lbs MK1 could be little bit better ( expecially in climb rate).

[ICDP]

Originally Posted by *Buzzsaw*

Wrong. The Spit II has lower performance than an aircraft at +8.8 boost:



Image courtesy of Mike Williams Spitifire Performance site:

http://www.spitfireperformance.com/spittest.html

I posted over 20 days ago speed tests for the Mk IIa in CoD that showed it matches a +12 boost Spitfire. I even asked you directly if you had tested it yourself in the sim, I ask once again, have you tested it yourself in CoD? The chart you posted shows 290 for SL top speed for a +9 lb boost Mk IIa, the Mk IIa in CoD gets 315 at SL.

Here, once again is the Mk IIa Spitfire CoD speeds compared to real Spitfire speeds.



As can be seen the Mk IIa speeds are spot on when compared to a +12 lbs boost Spitfire Mk Ia. The speeds are around 20-25mph faster than the 9 Lbs boost Mk II a speeds which would put them about right for 12 lbs boost. Also at the full throttle height of around 18,000 ft the boost there should be no speed difference between 9 lbs or 12 lbs boost.

The Mk IIa in CoD (at least in speed for altitude) is definately a 12 lbs boost version. The guage in CoD is broken.