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Posted (edited)

So i'm having a little trouble with the mission where you land on mt Elbrus (18,510 ft)

 

if i my airspeed is only around kias am i entering a retreating blade stall state when i underspeed the combined rpm?

 

or rather

 

in short term emergency situations like this near the edge of the envelope is it ok to exceed recommended min RPM or does that lower performance?

Edited by scott tyrell
Posted

Going bellow min RPM puts you close to rotor blades stall, plus because of the rotor coning under high load and low speed - the "area of rotor disc" is shrinking - giving you less lift, plus drop in main rotor RPM, means also loosing rpm on the tail rotor, which also then looses its effectiveness.

 

AVOID.

 

When your RPMs are dropping to the 6100 N2 (that's when the warning is going off), adjust with governor beep switch - give yourself more room. If this is not enough, emergency (manual) governor have more room for adjustment, but beware, that switching it to manual in mid flight with the throttle still at auto/full position may over-speed the rotor (another no-no).

[sIGPIC][/sIGPIC]

"If a place needs helicopters, it's probably not worth visiting." - Nick Lappos

Posted

Someone was mentioning that this mission is still work in progress and needs adjustment. I haven't run it for two weeks now so don't remember details, but think I remember there were barely any wind, and wind in mountains is a pretty big thing. I don't think DCS is simulating the ascending and descending winds on the slopes, higher speeds in the saddles, etc. With correct environment modeling and mission execution we wouldn't have much problems there, as you would be most likely above ETL, whiles till sitting on the ground :)

 

[sIGPIC][/sIGPIC]

"If a place needs helicopters, it's probably not worth visiting." - Nick Lappos

Posted
I found I could not get off of the mountain after the troops loaded up. I have to drag the skids forward and get some forward speed built up going down one side of the mountain before I could get enough lift....

 

That's actually a viable option and performed during Vietnam war. Read Chickenhawk to get ideas on how to land into impossible spots and get out of them loaded!

Posted
That's actually a viable option and performed during Vietnam war. Read Chickenhawk to get ideas on how to land into impossible spots and get out of them loaded!

 

Indeed. They'd also do things like rudder pedal turn in a certain direction to give a boost to the engine (application of anti-torque robs some engine power)..

 

What a great book..

 

BeachAV8R

Posted
Indeed. They'd also do things like rudder pedal turn in a certain direction to give a boost to the engine (application of anti-torque robs some engine power)..

 

What a great book..

 

BeachAV8R

 

 

Yes, this is also a common procedure with the lama and alouette... when you are in logging operations, you push max BladeAngle and then push the PowerPedal, (No Torque indicator, so no Torque restrictions) due the spin of the Helicopter, the Blades also Spin "faster" More Bladespeed, more POWER ^^

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