True Altitude?

[KG26_Alpha]

IL2 1946 is not 12 years old, the game engine had a major overhaul at least twice since its original release that I can remember, probably more.

Anyhow...................

As I had a small amount of time to test today I did some work in the Lofte bombsite and made perfect drops.

Still working on Russian Bombsite..............

True Altitude calculation is needed.

He111 H6 2 x 500kg

Field Temp : 35
Field Alt : 30m
Ind Alt : 4000
OAT: -2
IAS : 270
TAS: 340
TA : 4150m

Now direct hits for German Bombs precisely where they are calculated and aimed using TA




















.

[Soldier_Fortune]

Originally Posted by KG26_Alpha

...
As I had a small amount of time to test today I did some work in the Lofte bombsite and made perfect drops.

Still working on Russian Bombsite..............

True Altitude calculation is needed.

He111 H6 2 x 500kg

Field Temp : 35
Field Alt : 30m
Ind Alt : 4000
OAT: -2
IAS : 270
TAS: 340
TA : 4150m

Now direct hits for German Bombs precisely where they are calculated and aimed using TA
[/COLOR]

This could be the answer to the question with which I opened this thread. But we must be cautious.

Some remarks:

- For an OAT = -2ºC @ 4000 m, the OAT @MSL should be 24ºC. In the vanilla version there are only 2 maps that meet that condition: Kuban and Bessarabia. And there is not maps with 35ºC @ MSL. So I assume you've used one of those maps, or any map of 25ºC (the difference of OAT at 4000 m would be negligible anyway).

- It seems you are repeating some of my tests, and extracting the same conclusions than me. But also you should test if for you TALT works with other very different maps (i.e.: Gulf of Finland_winter -20ºC @MSL and flying at altitudes above 5000 m). As far as I tested, TALT doesn't confirm that outcome with colder maps.

- "Target or miss" may be defined in many ways. "Target destroyed" may be one way. "Hit at less than xxxx meters" may be other. I don't know what you're using, and it is important to know if we are describing results in the same way. In my tests I used the ring target and considered "target" any hit within the limits of the external ring. Sometimes I've achieved direct impacts in the centre of the ring... but I considered them as a part of the "good luck factor".

- BTW, also I was testing the blast radius of different Russian bombs, and it seems they are well modeled. Is far as I can recall, a pair of 100 kg bombs have a blast radius of 40 m; a pair of 250 kg, around 80 m; a pair of 500 kg, around 120 m; a 1000 kg bomb, 140 m; a 1500 kg, around 200 m. More tests are needed with these and other bombs; but I think the blast radius are close to the real. All tests were made in open and flat terrain, using Willys as targets, covering a square of 200 x 200 m. I discovered a curious effect: sometimes some nearest target was not destroyed, while the farest were KIA... like if certain random effect appears.

Please: Carry on some tests with colder maps to see if the TALT works for you, and let me know your data and outcomes.

[KG26_Alpha]

I'm spending no more time on it.

There's enough data here to have TD make changes.

[Soldier_Fortune]

Originally Posted by KG26_Alpha

...

There's enough data here to have TD make changes.

Really...??
I'm seeing no posts in this treath of any TD member till now.
So, I don't know if they are interested to solve this issue.

[KG26_Alpha]

Originally Posted by Soldier_Fortune

Really...??
I'm seeing no posts in this treath of any TD member till now.
So, I don't know if they are interested to solve this issue.

Perhaps direct this thread into the bug report v4.12.2 sticky.

[KG26_Alpha]

Originally Posted by Soldier_Fortune

Really...??
I'm seeing no posts in this treath of any TD member till now.
So, I don't know if they are interested to solve this issue.

Check your PM box

[KG26_Alpha]

Originally Posted by Soldier_Fortune

Really...??
I'm seeing no posts in this treath of any TD member till now.
So, I don't know if they are interested to solve this issue.

Jeremiah_Weed
&
Soldier_Fortune

Check your PM boxes

[Soldier_Fortune]

Thank you, KG.
I did read it!

[FrankB]

Hi Soldier Fortune,

I did some tests using your formula to calculate TAS, but I still seem to have unsatisfactory results on winter maps.
In the past weeks I have learned how to use FMB to create custom mission for testing.

Test environment:
- stock 4.12.2
- SB-2, 100% fuel, 6x100kg bombs
- altitude 2000m
- IAS 330km/h
- bullseye placed at 0m elevation on the shore to simplify the calculations
- no wind on the maps
- coming in from the water

Calculations:
- got TAS from IAS and ground temperature as per your equation
- got the bombing angle using the calculated TAS and altitude

Results:
- good hits on the Crimea map (at least one bomb landed within the pattern)
- bombs fell short on Moscow winter map by at least 3 patterns

So some other variable comes to the play when calculating the bombing angle - maybe the air density/resistance...