Vortex Ring State

[V1Rotate]

Hmmm, can someone confirm how the rotor blades are de-iced? Does it use rubber "boots" or is it a heating element that you can leave switched on? If it's the latter, is there a time limitation per cycle or is it automatic?

[deviletk]

PDF manual search "de icing" and it tells you its a warm up of blades. And it can be left on. ;)

[nemises]

Yeah, they can be left on, but at the expence of some available engine power..not very much, but at altitude, you'll notice it.

Of course, unfortunetely, at altitude is when you generally need the de-icing !

[AlphaOneSix]

You shouldn't lose any engine power from blade de-icing, as it's done electrically. Also, conveniently, it's an automatic system, so you can just turn it on and leave it on once you get below a certain temperature outside.

 

The engine anti-ice, however, uses bleed air from the engine itself, so using the engine anti-ice does take away a little bit of power from your engines. The dust protectors also use bleed air from the engines, so also take some power.

[Oakes]

How is icing conditions modeled in DCS BS btw?

 

High altitude doesn't normally automatically equal icing nor does a low temperature (as far as I know the colder the air gets the less the risk of icing because the moisture has already condensed into rain i.e cold air = dry air)

 

For icing to form don't you need moisture either in the form of clouds or as rain (freezing rain or drizzle being the killer here)?

 

As an example in Cumulus clouds with a temperature of 0 to -20 degrees C the risk for icing is high, in the same type of cloud but with the temperature at -15 to -40 the risk is medium and below -40 the risk is low.

 

In rain or drizzle at 0 degrees or below get the h**l out of dodge before you are turned into an icicle:helpsmilie:

 

So clear cold air no problem with icing in DCS BS...or are there other factors for rotor aircrafts?

 

/oakes

[Yo-Yo]

The limiters work off of your engine RPM and temperatures. You are prevented from going over some percentage of N1 (101.15% max?) and you also cannot exceed a certain EGT (990C?). I forget exact numbers.

 

In a helicopter, your EGT is a good indicator of how much power you are using.

 

As you get higher in altitude, and/or the outside temperature gets warmer, your engines have to work harder (i.e. hotter) to produce the same amount of power.

 

EEG also lowers real rpm to prevent Mach overspeed of compressor blades at high altitude so you can see that GGrpm =98% you use to see at low altitude lowers as you get high.

Also the EGT gets higher at high altitude so even I can not say exactly what parameter limits engine performance at certain altitude... :)

[Yo-Yo]

How is icing conditions modeled in DCS BS btw?

 

High altitude doesn't normally automatically equal icing nor does a low temperature (as far as I know the colder the air gets the less the risk of icing because the moisture has already condensed into rain i.e cold air = dry air)

 

For icing to form don't you need moisture either in the form of clouds or as rain (freezing rain or drizzle being the killer here)?

 

As an example in Cumulus clouds with a temperature of 0 to -20 degrees C the risk for icing is high, in the same type of cloud but with the temperature at -15 to -40 the risk is medium and below -40 the risk is low.

 

In rain or drizzle at 0 degrees or below get the h**l out of dodge before you are turned into an icicle:helpsmilie:

 

So clear cold air no problem with icing in DCS BS...or are there other factors for rotor aircrafts?

 

/oakes

 

We only made a half of job to be in time with BS release... :) sorry, we had to presume water content value low but spatially constant. This value depends on temperature close to the values you mentioned.

The different water content in clouds, rain,water dust over the sea, etc are the point number one in our feature list as well as wind enhancement.

[Oakes]

Ok, so let's see if I got this correct, since water content only depends on the temperature of the air independent of the presence of clouds or rain, icing will form from about 0 deg C to -40 deg C OAT with 0 being the worst in terms of icing and -40 not so bad, clouds or no clouds.

 

Another question while we're at it, is the OAT is implemented as a perfect standard atmosphere? --> meaning a 1000 feet increase in altitude means about -2 deg C in temp. No funny inversion layers in other words:smilewink:

/Oakes

 

 

[Yo-Yo]

Ok, so let's see if I got this correct, since water content only depends on the temperature of the air independent of the presence of clouds or rain, icing will form from about 0 deg C to -40 deg C OAT with 0 being the worst in terms of icing and -40 not so bad, clouds or no clouds.

 

Another question while we're at it, is the OAT is implemented as a perfect standard atmosphere? --> meaning a 1000 feet increase in altitude means about -2 deg C in temp. No funny inversion layers in other words:smilewink:

/Oakes

 

 

 

You are right. The worst condition must be at 0...-7 C and down to -25...30 the air gets dry. The OAT has no inversion but depends on SL temp.