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[Uzin]

As perhaps somebody know, I released some *.ntrk files where I take off and land on some Belarus airfields, using Yak-1B, LaGG3, MiG3, La5FN and I-16. I tried also to fly I-15 Tchaika, but I did not succeed in its landing : either it was too fast, or spinned when landing. Its drawback I see is the absence of both flaps and vertical ruler trim.
I asked guys on dispersalfield and they suggested that FM of Tchaika is wrong from the beginning of Il-2 .
Has anybody some info about that matter ? Or is anywhere FM repaired in any mod ?
Does anybody fly the crate at all ?

[The_Jester]

     Which model? I could see you having this problem with the M-22, but not the M-62. The early models are effected heavily by engine torque and the later ones not so much. I have no problem with landing the 152 and 153, but the 15 is rather squirrely and it seems to want to come in on the left wheel every time. It also seems to suffer from a low stall speed(about 90km/h) with ground effect, which threw me for a loop when I tried to bring the tail down. Otherwise, the aircraft seems fine. Just don't try flying above 3000m.

     Overall, yes, the FM is wrong, but this is mostly due to the fact that it's a Russian game and the creators gave all the Russian aircraft flight characteristics that are generally better. If the aircraft were modeled accurately, the I-15 M-22 and M-25 would spontaneously combust every time it went into and turn and the Yak models would be assigned a random FM generator so one aircraft would fly like a B-25 and the next a Spit.

[Uzin]

I asked guys on dispersalfield and they suggested that FM of Tchaika is wrong from the beginning of Il-2 .

Unless they provide DETAILS, their opinion is not usefull.

Therefore I am asking the questions also here.

I like I-15 very much, but unfortunately never find time to fly it. Do you know if it had elevator trim in real life?

It is worth to fly it, especially to try landing. Now I am searching any info about elevator trim in R/L.

Here is a drawing, obviously none elevator trim present:

http://www.airwar.ru/image/idop/fww2/i15/i15-1.gif

http://www.airwar.ru/image/idop/fww2/i15b/i15b-1.gif

[<Gunny>]

Uzin- I fly and the love the I-15. I play in on-line and off.
I have never had the problems that you say you have.

My set up is HSFX if that makes any difference.
I love the Bi-Planes all of them.

[The_Jester]

     Overall, yes, the FM is wrong, but this is mostly due to the fact that it's a Russian game and the creators gave all the Russian aircraft flight characteristics that are generally better. If the aircraft were modeled accurately, the I-15 M-22 and M-25 would spontaneously combust every time it went into and turn and the Yak models would be assigned a random FM generator so one aircraft would fly like a B-25 and the next a Spit.

We are trying to make a usefull discussion here... what you wrote is just a vague cliché which ends quite ridicoulously, please take this subject seriously or refrain from posting here 

True. I just get frustrated by them and don't have anyway to spout. Anyway, no, the I-153 didn't have trim of any sort. It is my understanding that one of the models, I don't know which, could turn through 360 in 15 seconds. Pilots generally reported the aircraft was much easier and far more pleasurable to fly than the I-16. It would be nice if engine fires were modeled because they occurred when(I cannot recall where I read this) the aircraft went through a negative g maneuver or flew upside down as the fuel would leak out the cap and the engine would ignite the fumes. This was a major problem with early models.

[CWMV]

Sounds about right for a Russian airplane 

[Uzin]

Here is *.ntrk file of my take off and landing on Lida airfield (Belarus  map patch not yet released) flying I-15bis, which I am not proud of , but leaved the crate on my own foot. 
Flying at I-15 M22 is much worse, I need much training.

https://www.mediafire.com/?1p6p2hns27xdgi1

[The_Jester]

Interesting! I will have a look my books to try distinguish what counts as "early model"... as to find out how fast this problem was corrected (otherwise no point in trying to simulate it). Then, if it justifies, I am in for some java experiments on spontaneous engine fires...

Found this on wikipedia, but I remember reading about modifications which had to made the six I-15 series aircraft that were restored recently.

"While the overall I-153 performance was satisfactory, some significant problems were revealed. Most troublesome was the absence of a firewall between the fuel tank mounted in front of the cockpit and the pilot. Combined with strong draft coming in through the wheel wells, fuel tank fires invariably resulted in rapid engulfment of the cockpit and severe burns to the pilot. In addition, the M-62 engine suffered from a service life of only 60–80 hours due to failures of the two-speed supercharger."

I may be wrong in saying this was an early model thing, but it depends on what was being flown in China. does anyone know specifically what model they received?

[juanmalapuente]

I-15 was used by hundreds in SCW, as you know. There're frequent references to crash landings, nose landings, "caballitos", but never, ever, that nonsense of spontaneous combustion. 

[The_Jester]

Okay, so the combustion problem was limited solely to the I-153? Did it also occur in the I-152?

[The_Jester]

However, would it still not be possible for inverted flight to result in combustion in the 15 and 152 or were they fitted with a firewall? Also, since the fires on the 153 were a direct result of air coming in through the landing gear fairing, would the aircraft be more prone to fires on takeoff and landing when the gear was down or did the gear being raised increase the airflow through the engine compartment?

[The_Jester]

No, sorry for the confusion, i'll try and sum up what's been established. When retractable landing gear was added to the 153, the wheel well was open to the rest of the engine compartment to some degree. Somehow the resulting change in airflow caused fumes from the fuel tank to be ignited by the engine as a result of a lack of a firewall. What's still to be sussed out is whether or not the negative g fuel leak was present on all models of the I-15 series and whether or not all models had firewalls. If there is no firewall, it means explosion is possible on all models when pulling a negative g maneuver so long as there is also a leaky fuel tank.