A trip to the mountaines...

[Belphe]

I've had an "experience" today ;) I took off from Sochi and headed North-West, into the mountaines. I started following a river and climing higher and higher as the terrain around me started to change. On my way I found many school busses on the roads... but that's not what I want to tell you about :) Suddenly the steep mountain slopes revealed a beautiful lake with a flat bank. I decided to land there and maybe catch a few fish for dinner. I performed a nice approach from the center of the lake towards the flat bank and nicely put the helo not far from a nearby settlement. After having a nice talk with the native folk and exchanging our t-shirts :lol: I decided it was time for me to leave. As the Coroner has later revealed some teen village boys have tied my main gear to the ground and as soon as I increased the collective my shark blew up! :huh: :cry: :doh:

 

Seriously, what happened? Why did I turn into a fireball soon after increasing the collective? Did I dig in the ground???

[sohei]

Could it be sand clogging the engine perhaps? Was dust protection on? I imagine it's more likely to be a physics bug, although the local kids can be real hellraiser, or so I hear.

[Belphe]

:D Amen! Hmmm, dust covers were on... :/

[Krippz]

Could it be sand clogging the engine perhaps? Was dust protection on? I imagine it's more likely to be a physics bug, although the local kids can be real hellraiser, or so I hear.

 

I concur, it appears that a lot of dust got into his engine.

[Frederf]

Landing on non-airfield terrain in DCS is known to be semi weird.

[slowhand]

you should have watched the replay..did you de-ice? if you where high up in the mtns you may have been iced over..just an idea....did you page up 2 times(throttle) before you pulled up on the stick?

Edited May 22, 2009 by slowhand

[Belphe]

No de-ice - 30 degrees summer midday - yes, high in the mountaines but still Sochi was set to 30 Celsius... :/

Sure I set the auto-throttle! ;)

[EtherealN]

I'm going vaguely on memory here, but if the temperature at MSL is 30 celcius you'll have (under average conditions) about 23 degrees at 1000 meters, 15 at 2000 meters and 8 at 3000 meters. I'm not sure if this is correct for the area down there though - it's correct at my place where we enjoy the Gulf Stream. I am also unsure on what happens with the temperatures through compressor stages and things like that. But don't just assume that there will be no ice just because it's a hot day on the ground - temperature falls fast with altitude.

 

(As an example, a jumbojet cruising at 10k above Sahara, that's the edge of the troposphere, will be flying in -60 degrees air - roughly.)

Edited May 22, 2009 by EtherealN

[Frederf]

A drop in 6.5°C for every 1000m. Engine icing is actually more likely in hot air instead of cold air. Hot air can hold a lot of moisture while cold air cannot. There is no danger from airframe ice since the air moves slowly over the airframe. In the engine however air moves very fast and can get very cold which makes all the moisture fall out of the air inside the engine.

 

Carburetor ice is most dangerous for a Cessna at 70°F.

[DarkWanderer]

The lake was not iced - hence the temperature is no less than -5C, hence no icing possible ;)

Also, iceing results in gradual engine flameout, not instant explosion.

So it really looks like a bug. mangaroca, maybe you can do a track?..

[arneh]

I find this happens a lot when landing outside of hard surfaces (i.e. not on a runway or road). One wheel will often "get stuck", and probably cause the helicopter to crash on take off unless you can get it unstuck in time. Same thing if trying to taxi on such a surface, one wheel will often get caught up.

 

Engine icing or dust won't cause that sort of behaviour, it will just degrade engine performance.

[Belphe]

Thanks! :)

[AussieFX]

Also, iceing results in gradual engine flameout, not instant explosion.

So it really looks like a bug. mangaroca, maybe you can do a track?..

Very true, a good friend of mine died in a Jetranger due to an icing related flameout.

It could be that you pulled too much power and sent the engine temps beyond limits attempting to unstick yourself.

I was playing around during training the other day and my machine exploded after I ignored an engine vibration warning on #1. :pilotfly:

I have found in this game you ignore warnings at your peril.

[Belphe]

OK guys, I have tried a few more times and it never happened again! HOWEVER,... :) while lifting off you can tell at least one of the main fuselage wheels is sort of "glued" to the surface and you need to increase alt VERY SLOWLY and compensate with the cyclic to keep the helo at ZERO horizontal speed! After a while (half a second???) the ground "releases" the gear and you're airborne! :D Thanks a lot!

 

So you CAN land and take off anywhere! :D

[JimMack]

OK guys, I have tried a few more times and it never happened again! HOWEVER,... :) while lifting off you can tell at least one of the main fuselage wheels is sort of "glued" to the surface and you need to increase alt VERY SLOWLY and compensate with the cyclic to keep the helo at ZERO horizontal speed! After a while (half a second???) the ground "releases" the gear and you're airborne! :D Thanks a lot!

 

So you CAN land and take off anywhere! :D

 

Sorry, you can not take off and land anywhere. The key factor is the slope of the ground, which is difficult to judge from the cockpit view. You must eyeball your landing spot and satisfy yourself that is flat (+/- 5%).