Level flight speed

[felixx75]

14 minutes ago, Arch-vile said:

Using the mouse to jam the prop governor past the stop (looks like a bug to me) shouldn't be required to get the posted performance figures.

This is definitely a bug, especially as there is no “...past the stop”. The lever cannot be moved any further once the axis have been set correctly.

[Arch-vile]

Here's a video I recorded trying to put it through its paces. You can see the inability to accelerate in level flight. I cycled cooling doors to verify. Also tried different super charger settings. I can get it up to higher speeds by diving but once level, or after bleeding speed by maneuvering it doesn't recover well. And WEP seems to have 0 effect. Light eventually comes on but I never notice any increase or decrease in power. I didn't use it at all in this video. I can't say for sure there's something wrong, but the airplane feels really anemic at mill power and the figures in the early-access manual included with the module implies much higher speeds (I understand CAS vs IAS as well, it doesn't account for the difference).

/shrug

I'm giving up troubleshooting it and will fly around it, but definitely feels underpowered at mil power and WEP seems ineffictive.

[westr]

2 minutes ago, Arch-vile said:

Here's a video I recorded trying to put it through its paces. You can see the inability to accelerate in level flight. I cycled cooling doors to verify. Also tried different super charger settings. I can get it up to higher speeds by diving but once level, or after bleeding speed by maneuvering it doesn't recover well. And WEP seems to have 0 effect. Light eventually comes on but I never notice any increase or decrease in power. I didn't use it at all in this video. I can't say for sure there's something wrong, but the airplane feels really anemic at mill power and the figures in the early-access manual included with the module implies much higher speeds (I understand CAS vs IAS as well, it doesn't account for the difference).

/shrug

I'm giving up troubleshooting it and will fly around it, but definitely feels underpowered at mil power and WEP seems ineffictive.

I'm having the same findings. Although I agree its cheating the RPM trick is giving it better combat performance so I am using it as the figures seem closer to published in terms of speeds.

Just flown for over 40 mins maximum throttle as described couple of posts back, after 15 mins green light come on saying I have 3 mins of water left. 10 mins later i'm still flying 270 kts maximum throttle & RPM light still on.

So I try the RPM trick to see if the water will exhaust. But after a further 25 mins the engine finally overheated. Green light was still on.

On this basis I agree with Felixx the RPM bug does not appear to be adding water injection.  

Look overall I'm enjoying the module and think there's a lot about it that's been really well done. I just hope that they acknowledge these findings and work on them.  

[Hayrake YE-ZB]

The performance discussion is devolved into a confusing mess because the players are still leaving out some of the critical parameters. We can’t understand the problem when basic altitude and power settings are omitted, and whether you are describing indicator or true airspeeds. It’s not difficult to add Kias or Ktas to your numbers.

Then you have players making declarations based on the performance of other modules, or their own intuition, instead of referring to flight manuals for performance. 

I also haven’t seen anything in the F4U real world flight manual that talks about rpm above 2700 rpm, which would put the prop tips well into supersonic range and decrease efficiency, but I’ll keep looking when I get the chance. 

This thread started with this statement- “Can't seem to get more than 230-250 kts out of the thing in level flight. Anyone else?“ , and hasn’t gotten much better.

Edited June 25 by Hayrake YE-ZB

[westr]

9 minutes ago, Hayrake YE-ZB said:

The performance discussion is devolved into a confusing mess because the players are still leaving out some of the critical parameters. We can’t understand the problem when basic altitude and power settings are omitted, and whether you are describing indicator or true airspeeds. It’s not difficult to add Kias or Ktas to your numbers.

Then you have players making declarations based on the performance of other modules, or their own intuition, instead of referring to flight manuals for performance. 

I also haven’t seen anything in the F4U real world flight manual that talks about rpm above 2700 rpm, which would put the prop tips well into supersonic range and decrease efficiency, but I’ll keep looking when I get the chance. 

I was pretty specific in my post see previous page back. That was IAS BTW 270 kts taking into account altitude true airspeed etc is still not right.

Edited June 25 by westr

[westr]

11 minutes ago, Hayrake YE-ZB said:

The performance discussion is devolved into a confusing mess because the players are still leaving out some of the critical parameters. We can’t understand the problem when basic altitude and power settings are omitted, and whether you are describing indicator or true airspeeds. It’s not difficult to add Kias or Ktas to your numbers.

Then you have players making declarations based on the performance of other modules, or their own intuition, instead of referring to flight manuals for performance. 

I also haven’t seen anything in the F4U real world flight manual that talks about rpm above 2700 rpm, which would put the prop tips well into supersonic range and decrease efficiency, but I’ll keep looking when I get the chance. 

This thread started with this statement- “Can't seem to get more than 230-250 kts out of the thing in level flight. Anyone else?“ , and hasn’t gotten much better.

Marianas 20degrees. Clean aircraft, flaps fully up, Oil cooler closed, Intercooler fully closed. 8 kt tail wind Cowl flaps fully closed.

10,000 ft 2700rpm MP45 (reading), Supercharger 1st stage.

MP 60, Supercharger 2nd stage

MP 60 Supercharger 3rd stage 

Airspeed stays around 270kts

Climb to 10,500 ft. Dive to 300kts then level. Aircraft maintains 280 kts for a few minutes then settles back to 270kts. Supercharger set to 2nd stage.

Flown now for 40 mins. No overheating.

If you are able to achieve 300kts or over in this scenario please post your RPM and MP readings. As this is somewhere where I believe people may be experiencing variations. 

[Arch-vile]

Quote

This thread started with this statement- “Can't seem to get more than 230-250 kts out of the thing in level flight. Anyone else?“ , and hasn’t gotten much better.

I posted a video. I don't know how to be more transparent than that. I'd challenge anyone who thinks there are no problems to post a video showing them cruising in level flight at the manual's stated speeds and configurations and sustaining that for 5-10 minutes. Or show WEP being engaged and disengaged successfully with the listed MAP or airspeed changes.

I'd love to see that so I know it's an issue that's not affecting everyone. That helps add valuable data to the bug report.

[Kovacs]

18 minutes ago, Arch-vile said:

I posted a video. I don't know how to be more transparent than that. I'd challenge anyone who thinks there are no problems to post a video showing them cruising in level flight at the manual's stated speeds and configurations and sustaining that for 5-10 minutes. Or show WEP being engaged and disengaged successfully with the listed MAP or airspeed changes.

I'd love to see that so I know it's an issue that's not affecting everyone. That helps add valuable data to the bug report.

Same for me, did magnitude 3 react on this topic? We can't get out of it.

[Archaic]

The gear sometimes appears down in MP even though its up.

Is this the issue? Are gear invisibly down even after raising them? 

[felixx75]

1 minute ago, Archaic said:

The gear sometimes appears down in MP even though its up.

Is this the issue? Are gear invisibly down even after raising them? 

 

[Archaic]

Is it a desync or are the gear lifting only graphically and retaining drag? 

[Hayrake YE-ZB]

3 hours ago, westr said:

I was pretty specific in my post see previous page back. That was IAS BTW 270 kts taking into account altitude true airspeed etc is still not right.

What TAS does 270 KIAS work out to, and what was the temp at 10,000 that you tested at?

You didn’t initially specify IAS or TAS, you reference Stage 1, Stage 2 and Stage 3 supercharger modes, none of which exist on the Corsair, leaving us to guess what you mean. The supercharger modes of neutral, low and high blower are altitude specific, and you gave three MP values, none of which correlate to values in either the MAG3 handbook or the real F4U POH. I’ve never seen 60” of MP posted anywhere. I’d appreciate you showing me where that is published.

I’m not criticizing you, everyone’s doing it for various reasons, but unless you set up the power at a known setting and specific altitude that is published, then it’s not valid to criticize the speeds as being “wrong”.

There is definitely a problem somewhere as revealed by the relative speed disparities some are reporting. No question about that.

[westr]

5 hours ago, Hayrake YE-ZB said:

What TAS does 270 KIAS work out to, and what was the temp at 10,000 that you tested at?

You didn’t initially specify IAS or TAS, you reference Stage 1, Stage 2 and Stage 3 supercharger modes, none of which exist on the Corsair, leaving us to guess what you mean. The supercharger modes of neutral, low and high blower are altitude specific, and you gave three MP values, none of which correlate to values in either the MAG3 handbook or the real F4U POH. I’ve never seen 60” of MP posted anywhere. I’d appreciate you showing me where that is published.

I’m not criticizing you, everyone’s doing it for various reasons, but unless you set up the power at a known setting and specific altitude that is published, then it’s not valid to criticize the speeds as being “wrong”.

There is definitely a problem somewhere as revealed by the relative speed disparities some are reporting. No question about that.

There’s 3 supercharger settings on the Corsair the initial which I’ve implied as stage 1 then 2 others I would say it’s fairly self explanatory. Are you achieving over 300kts? 
are you saying what we have currently is correct? 

[westr]

10 hours ago, Hayrake YE-ZB said:

What TAS does 270 KIAS work out to, and what was the temp at 10,000 that you tested at?

You didn’t initially specify IAS or TAS, you reference Stage 1, Stage 2 and Stage 3 supercharger modes, none of which exist on the Corsair, leaving us to guess what you mean. The supercharger modes of neutral, low and high blower are altitude specific, and you gave three MP values, none of which correlate to values in either the MAG3 handbook or the real F4U POH. I’ve never seen 60” of MP posted anywhere. I’d appreciate you showing me where that is published.

I’m not criticizing you, everyone’s doing it for various reasons, but unless you set up the power at a known setting and specific altitude that is published, then it’s not valid to criticize the speeds as being “wrong”.

There is definitely a problem somewhere as revealed by the relative speed disparities some are reporting. No question about that.

First thing I wrote was Marianas 20 degrees temp.
 

It’s IAS I’m giving you the reading from my gauges. My figures directly correlate with Arch-Vile.  There’s 3 supercharger settings on the Corsair the initial which I’ve implied as stage 1 (set as default) then 2 then 3 I would say it’s fairly self explanatory. Are you achieving over 300kts IAS? MP is as I am reading from the gauge, 45 Supercharger neutral,  then probably 59 if you go by the manual but looks more like 60 on the gauge achieved with Supercharger set to low and high.   

 

sorry this probably sounds a bit harsh but yes this evening I shall check the barometric pressure and input that into a conversion chart but I guarantee it will not work out correct for the published top speed of the Corsair. Whilst some are saying it’s correct I have a feeling it will just be left as it is. 
 

has anyone tried flying with gear down and seen if it has an effect? 

Edited June 26 by westr

[westr]

Marianas 20degrees temperature. 1013.25 hPa, Clean aircraft, flaps fully up, Oil cooler closed, Intercooler fully closed. 0 wind speed Cowl flaps fully closed.

10,000 ft 2700rpm MP45 (reading), Supercharger 1st stage.(Neutral Setting!)

MP 60, Supercharger 2nd stage (Low setting!)

MP 60 Supercharger 3rd stage (High setting!)

Landing gear extended 210 kts. (after using True airspeed conversion- 268 kts)

Landing gear retracted 270 kts.(after using True airspeed conversion- 328 kts = 377mph) (270 kts IAS achieved with all supercharger settings)

 

In the same conditions at 20,000 ft I achieved 240kts IAS.

Using the same conversion calculator that works out at 357 kts = 410 mph

 

I'm happy to admit when I'm wrong and maybe this is correct? I'm pretty sure this conversion is correct, It then comes down to the same old question is the AI over performing?

I don't fly in MP but how are people finding the corsair performs against human pilots?

Having said that I'm having success against the FW190 A8 at all skill levels.

I do feel the 109AI would run rings around me though. Will be interesting to see how the A6M performs when it comes.  

Edited June 26 by westr

[Mr_sukebe]

20 hours ago, Mistermann said:

For those that might be interested in a more legible version of the table above.

 

This table mentions with and without the use of the Ram.

I don't remember seeing a control for that.  Did I miss something?

I also find it interesting that it doesn't appear to change the power levels, just at what altitude you can use the other settings at.

[Hayrake YE-ZB]

5 hours ago, westr said:

First thing I wrote was Marianas 20 degrees temp.
 

It’s IAS I’m giving you the reading from my gauges. My figures directly correlate with Arch-Vile.  There’s 3 supercharger settings on the Corsair the initial which I’ve implied as stage 1 (set as default) then 2 then 3 I would say it’s fairly self explanatory. Are you achieving over 300kts IAS? MP is as I am reading from the gauge, 45 Supercharger neutral,  then probably 59 if you go by the manual but looks more like 60 on the gauge achieved with Supercharger set to low and high.   

sorry this probably sounds a bit harsh but yes this evening I shall check the barometric pressure and input that into a conversion chart but I guarantee it will not work out correct for the published top speed of the Corsair. Whilst some are saying it’s correct I have a feeling it will just be left as it is. 

has anyone tried flying with gear down and seen if it has an effect? 

Not harsh at all, I’m about problem solving, which is why using accurate language helps to avoid confusion.

I mentioned your OAT, because when you set up a mission, the OAT that you choose is for Sea Level, and is reduced by the standard adiabatic lapse rate of 2ºC per 1000 feet of altitude (average value, in practice it varies depending upon moisture content of the air).


So your 20C at 10000 feet is in error, and would require a sea level temperature of 40C. For a 20C temp at SL, the temp at 10000 should be more like 0ºC. When I put your indicated airspeed value of 270 knots, I get 314 KTAS.

By the way, the indicated temperature felt by the aircraft would show a ram rise of 13C due to air friction, but this is taken into account on most flight computers.

Yes, I have tried max power and have posted the results here. At 2700rpm/58” at sea level with the landing gear down, blower neutral, and get 200-210 Kias.

Supercharger modes are restricted by altitude, and the performance charts reflected those limitations. I’m getting more MP than the very basic Magnitude3 numbers included in their manual, but about right based on the real world F4U numbers.

[UrgentSiesta]

FWIW:

Normandy instant action free flight.

14C

29.92

FL 130

Everything closed tight 

Trimmed to nearly straight & level

RPM 2700

Man 60

Blower stage 1

IAS 269kn

TS 341kn

Edited June 27 by UrgentSiesta

[Gunfreak]

I did a very unscientific test, clean, Kola map in -10C, sea level.

 

Everything closed, auto lean, 2700rpm, 60MP sea level. I get about 310knots(356mph) (574km/h) That's pretty good for sea level.

[BRONYA]

I believe there is currently a bug in the engine. During testing, I performed a shallow dive maneuver, after which the aircraft maintained a speed of around 295 knots. Even when the speed dropped later, it could still reach 295 knots in level flight, indicating a noticeable increase in engine power. Subsequently, I found that by manually dragging the throttle lever with the mouse to achieve higher RPM, the engine sound also became significantly louder. If this method of obtaining higher engine power is a bug, then why does the engine sound change so noticeably? I suspect that a significant portion of the engine's power is currently hidden and has not been discovered by us.

[Rudel_chw]

While I don't particularly like GR tutorials, this racing test seemed interesting to me with regard to the maximum speed at low level for each DCS warbird:

 

 

 

[captain_dalan]

Had this baby since launch, but only last night did I get enough free time to map the controls and take her for a spin. Without reading any manuals, just by feel and playing with mixture, throttle and propeller governor, managed 320 knots on the deck, without water injection. This was the default free flight instant action on the Caucasus map. I am yet to try  50% fuel clean runs at 100ft, 10000ft and 20000ft and to take a good look at the cheat sheets for engine management. I get the feeling many people just aren't used to these levels of manual engine management yet. 

Spent the rest of the night fine tuning the controls and dogfighting "Zeros"  ..... with ONLY the CENTER guns! Because I (repeat I) was too dumb to select the inboard and outboard .50 cals!!!!

Anyone knows any good recommended climb and acceleration profiles for this baby? She flies like a charm, even without curves (maybe a bit of curves for the rudders, as my feet are clumsy as all hell)! As long as you stay fast that is.  You take her too slow, and she will flip a wing on you in no time! 

null 

On 6/28/2025 at 2:15 AM, Rudel_chw said:

While I don't particularly like GR tutorials, this racing test seemed interesting to me with regard to the maximum speed at low level for each DCS warbird:

 

 

 

Man, don't let the pencil/button pushers tell you anything! The Grim Rippers are great, and probably one of the few last remaining DCS channels on YouTube that are actually FUN to watch. They don't take themselves seriously, and neither should you. It's all in good fun!  

[felixx75]

4 minutes ago, captain_dalan said:

Anyone knows any good recommended climb and acceleration profiles

 

[captain_dalan]

8 minutes ago, felixx75 said:

 

Thanks mate, great stuff! 

[Rudel_chw]

1 hour ago, captain_dalan said:

Man, don't let the pencil/button pushers tell you anything! The Grim Rippers are great, and probably one of the few last remaining DCS channels on YouTube that are actually FUN to watch. They don't take themselves seriously, and neither should you. It's all in good fun!  

I dont mind the fun and I’ve watched a lot of their tutorials, my gripe is that in many of them the instructor looks as if he learnt the craft or weapon the day before or even he is learning as he records the video .. honestly I prefer to learn from someone that is at least truly experienced on what he is teaching.