Lagg 3 Performance data (Alpha 32%)

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Lagg 3 Performance data (Alpha 32%)

Postby =69.GIAP=GRACH » Wed Nov 20, 2013 4:16 am

Feel free to edit or alter numbers as the build progresses/or as tested.

Service ceiling: (effective) 9500m
Service ceiling:(maximum) 10090m


Max dive speed: ~750kph

I started loosing parts 770-780kph, Loss of Ailerons/Elevators/Rudder occured and dive topped out at 800+kph no major structural failures evident.
(With no trim as of yet, at 750kph the aircraft will pull out of a straight dive even with full down elevator. I had to roll inverted as the A/C started to pull out in order for surfaces to fall off)

Best climb speed: (as per manual) 270kph

Stall speed clean: (max gross weight/idle power) 180kph

Stall speed flaps: (max gross weight/idle power) 160 kph
Various flap settings were tested 10-60 with minimal change in stall speed.

Stall speed clean: (max gross weight/full power) 150kph

Stall speed flaps: (max gross weight/full power) 130kph
Various flap settings were tested 10-60 with minimal change in stall speed.

Max Water temperature: (single green guage) 110deg

Max oil temperature: (3 needle guage) 115deg


Economy cruise:(max range) 280kph
RPM 1700 Manifold pressure 500mm (or 5 on the guage)

This works nicely for all altitudes tested 0-6000m, please note that at 6000m altitude, 500mm is full throttle. (and dont forget to lean the mixture)
At and above 2000m set supercharger stage 2.

When to set the stage 2 supercharger:
In a climb at 270kph you can switch at 1500m
If in level flight at 350kph+ switch at 2000m
(It appears that forced air induction is modeled to some degree)
Last edited by =69.GIAP=GRACH on Wed Nov 20, 2013 5:24 pm, edited 3 times in total.
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Re: Lagg 3 Performance data (Alpha 32%)

Postby =69.GIAP=MIKHA » Wed Nov 20, 2013 7:11 am

=69.GIAP=GRACH wrote:Feel free to edit or alter numbers as the build progresses/or as tested.


Service ceiling: (effective) 7300m
Service ceiling:(maximum) 7800m
I was able to hit the maximum briefly after closing all rads at 7500m, allowing speed to build to 250kph, starting a shallow climb, and feeding in flaps slowly to 20deg as the aircraft slowed below 200kph.


Max dive speed: ~750kph

I started loosing parts 760-770kph, Loss of Ailerons/Elevators/Rudder occured and dive topped out at 800+kph no major structural failures evident.
(With no trim as of yet, at 750kph the aircraft will pull out of a straight dive even with full down elevator. I had to roll inverted as the A/C started to pull out in order for surfaces to fall off)

Best climb speed: (as per manual) 270kph

Stall speed clean: (max gross weight/idle power) 180kph

Stall speed flaps: (max gross weight/idle power) 160 kph
Various flap settings were tested 10-60 with minimal change in stall speed.

Stall speed clean: (max gross weight/full power) 150kph

Stall speed flaps: (max gross weight/full power) 130kph
Various flap settings were tested 10-60 with minimal change in stall speed.

Max Water temperature: (single green guage) 110deg

Max oil temperature: (3 needle guage) 115deg


Economy cruise:(max range) 280kph
RPM 1700 Manifold pressure 500mm (or 5 on the guage)

This works nicely for all altitudes tested 0-6000m, please note that at 6000m altitude, 500mm is full throttle. (and dont forget to lean the mixture)
At and above 2000m set supercharger stage 2.

When to set the stage 2 supercharger:
In a climb at 270kph you can switch at 1500m
If in level flight at 350kph+ switch at 2000m
(It appears that forced air induction is modeled to some degree)


Grach,
Thanks for posting the info. You should retest the maximum service ceiling, though. I have taken the LaGG-3 to an altitude of 9,620 meters. I don't know if that is her ceiling either. When trim is implemented, I think I can squeeze a little more altitude out of her.

Do well and be well, always.
Mikha
The quantity of my flying errors has a quality all its own.

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Postby =69.GIAP=GRACH » Wed Nov 20, 2013 9:00 am

What were your settings mate? I must have missed something.

Running expert:
Mixture was tried at middle detent as well as full foreward. Wooden handle was full foreward for stage 2 and it was a struggle to get 7800m

RPM was maxed out at 2700rpm.


*EDIT*

Found it.

All of my testing was completed at Maximum Gross weight (100% fuel)

I tried again at 30% and managed 10090m That weight in gas does make a difference.


Anyone feel up to testing service ceiling at 80% and 50% fuel?
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Postby =69.GIAP=RADKO » Wed Nov 20, 2013 11:16 am

Is pitch currently working? I'm honestly struggling to tell if it's actually doing anything.
C!

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Postby =69.GIAP=MIKHA » Wed Nov 20, 2013 3:11 pm

=69.GIAP=GRACH wrote:What were your settings mate? I must have missed something.

Running expert:
Mixture was tried at middle detent as well as full foreward. Wooden handle was full foreward for stage 2 and it was a struggle to get 7800m

RPM was maxed out at 2700rpm.


*EDIT*

Found it.

All of my testing was completed at Maximum Gross weight (100% fuel)

I tried again at 30% and managed 10090m That weight in gas does make a difference.


Anyone feel up to testing service ceiling at 80% and 50% fuel?


Grach,
You can get her up to 9620 meters with almost a full tank of gas. I climbed out at max rpm, at 270 kph indicated, up till about 3 km. Over 3km I started to lean out the fuel air mix, plus I adjusted my climb speed so that I was climbing about 10kph indicated slower, per 1000 meters that I climbed, so at 4000 meters I maintained a pitch angle, with full throttle and full rpm, that delivered a forward speed of about 260 kph indicated, etc. Do well and be well, always. Mikha

P.S. I'll make a video of a climb out, so I can show what I am doing.
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Postby =69.GIAP=GRACH » Wed Nov 20, 2013 5:23 pm

No time to test today, but I must have been climbing at too low of an airspeed.

I will take your numbers and call it ~9500m effective at full fuel.
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Postby =69.GIAP=GRACH » Wed Nov 20, 2013 5:29 pm

Pitch is working Radko. You can see on the RPM guage on the upper right part of the panel. (two needles, looks like a clock face that only goes to 0-8 )

To check your pitch controll is bound correctly the wooden handle moves back and forth underneath the throttle is the pitch lever. Full fine pitch (100%) is with the handle full forewards.

I have mine set on buttons to do it incrementaly. Haven't tried a slider/rotary yet.
Last edited by =69.GIAP=GRACH on Thu Nov 21, 2013 3:02 pm, edited 1 time in total.
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Postby =69.GIAP=MYATA » Wed Nov 20, 2013 7:15 pm

slide, rotary or any other axis is working fine in regards of Prop Pitch Lever.

Just be aware that Prop Pitch in IL2 1946 IS NOT Prop Pitch in IL2 BoS
Min settings gives you 1600 or 1700 RPM (if I remember correctly)
Max settings fixes it at 2700 RPM. This is to prevent your engine to overrun and as long as this mechanism can keep up the selected RPM, dependent on your selected Manifold Pressure, as long it will.
S!
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Postby =69.GIAP=MIKHA » Thu Nov 21, 2013 7:25 am

Guys and Gal,
Tonight I performed another maximum altitude test and I only got up to 9300 meters, instead of 9620 meters, as I did the day before. I am wondering what I did differently, tonight? I took screenshots the day I climbed out to 9620 meters. Tomorrow, I am going to look at the pictures to check the instruments and look for clues as to why I under-performed tonight.

Do well and be well, always.
Mikha

P.S. I suspect some LaGG-3s are more equal than others. There may be a random element in engine performance, every time we enter a mission. Some engines are just better than others in performance and the selection of which engine we get may be selected by some manner of random number generator or some such thing.
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Postby =69.GIAP=VLADI » Thu Nov 21, 2013 8:12 am

=69.GIAP=MIKHA wrote:Guys and Gal,
Tonight I performed another maximum altitude test and I only got up to 9300 meters, instead of 9620 meters, as I did the day before. I am wondering what I did differently, tonight?

Weather was different :P :) :P
We have seen different performance in ROF, too.
Not sure if they've added a random factor. But certainly you have a lot more influencing parameters as compared to old il2. E.G. engine temperature, Radiator drag, and more...
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Postby =69.GIAP=MYATA » Thu Nov 21, 2013 6:21 pm

Yesterday I climbed up to 9400 having fuel fuel - it was painfull :)
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