[NEED TRACK REPLAY]Pitot Heat Non Operational.

[Tinkickef]

Channel map temp is 0C all the time and the airspeed indicator suffers classic icing up.

 

After a period of time...

 

Indicated airspeed does not change with power appled or reduced.

indicated airspeed rises with altitude and falls when descending.

indicated airspeed remains at 200mph when stationary on the ground after the landing rollout.

 

Every mission means returning home guessing my final approach airspeed with rpm and prop pitch.

 

I switch on pitot heat at the same time I flip up the generator switch, them being next to each other at engine startup. There are no breakers out on the panel.

[BIGNEWY]

Hi

 

The channel temprature issue has been reported.

 

Do you have a track replay with he pitot issue, seems ok when I test

 

thanks

[-0303-]

On 6/28/2020 at 10:24 AM, Tinkickef said:

Indicated airspeed does not change with power appled or reduced.

indicated airspeed rises with altitude and falls when descending.

indicated airspeed remains at 200mph when stationary on the ground after the landing rollout.

I just experienced just this on Caucasus Aerobatics Online Server (winter time).

All three things including the ~200. It happened after 30 minutes maybe. Pitot was on all the time.

 

[-0303-]

Same thing happened again. IAS stopped working stuck at 350, dropped slight to 300. Pitot heat on, flew maybe 30 minutes.

 

... and again.

<insert screenshot climbing 700 mph at 21K feet climbing 4000 feet/min>. Stuck at 215 mph on ground.

 

The Speed increases with height and vice versa. The kind of real mechanical IAS I'm familiar with depends on surrounding air pressure. Note, only IAS, NOT VSI or Altimeter affected. So, if pitot "frozen shut" I can imagine this making sense (in that it models a frozen pitot).

 

Could be as simple as the "heat pitot tube" algorithm never being activated.

 

Aerobatics Server

-3C, minimal wind.

Edited February 16, 2021 by -0303-

[-0303-]

Here's a track. Clean install ... yada yada.

 

Default weather except temp set to -3C. Spawn single P-47. Airstart Batumi, accelerate time. Getting beyond Gudauta I noticed speed decrease in dive, then climb 450 mph ...

47pitot.trk

Go F10 map, speed up until halfways between Gudauta - Sochi-Adler (time "1840"), it manifests.

Edited February 16, 2021 by -0303-

[-0303-]

Experiment:

Precisely the same behavior with a P-51 (-3'C, trip Batumi - Gudauta) with pitot heat deliberately off. IAS decrease in dive, increase with climb ... IAS functionality return within a minute after turning on pitot heater. Landed Gudauta, came to a stop, IAS = 0.

 

So, again I suggest, Pitot heater algorithm doesn't work for P-47. Either because switch doesn't turn it on or it never works at all.

 

Ed/add

Spitfire & Bf 109 same behavior. Pitot off (-3'C), IAS stops working after flying "a while", starts working after a "minute" (no timing) on turning pitot heater on. Spitfire same distance Batumi-Gudauta, Bf 109 had to fly ~twice as long before IAS "iced up", ended landing Gelendzhik.

 

So, P-51, Spitfire, Bf 109 pitot heating works while P-47 pitot never "turns on". Run out of fuel I-16 (-3'C) without "icing" pitot. Hmmm...

Edited February 21, 2021 by -0303-

[Nealius]

Yesterday I also experienced IAS dropping to zero during a dive in the Mustang in 20C weather with probe heat off. Shortly after turning probe heat on my IAS climbed to normal. Something's wacky with the probe heat/icing modeling across the entire DCS World.

[-0303-]

Make a track with a clean install if you think it's wrong. Without serious research, temperature drops at altitude. I know for a fact, on a high summer day, late June (on the ground) one can fly inside a "snowstorm" inside a cloud ~3000 feet up.

 

https://courses.lumenlearning.com/geophysical/chapter/layers-of-the-atmosphere/

 

Edited February 23, 2021 by -0303-

[Nealius]

That's the thing: icing should only occur when there's moisture in the air, e.g. flying through clouds. DCS models icing of the pitot probes even in clear skies.