Is de-icing modelled in the default heavies? When should I have it on and when should I have it off?If it's not modelled, is it in payware such as PMDG737?Speed.

It's not modelled in FS. Full Stop.Pitot icing IS modelled, however, and on some of the heavies the general `icing` switch controls BOTH, so you need to have it on. No payware models icing. Ariane and a few others have the visual `trick` of creating opacity of the windscreen to simulate flight into icing conditions but this is a pointless waste of resources as the effects of icing on the airframe are not modelled. Entertainment value only!Allcott

>It's not modelled in FS. Full Stop..........................>Allcott Icing and de-icing certainly are modeled in FS. However, the de-ice switch in the C206 and perhaps some other AC doesn't work. I had to use KB assignments to get all the deicing functions to work. Further, the AIR file has to be set correctly for different kinds of de-icing. Prop Deicing works. There are two kinds of prop deice: One emulates a boot, and prop efficiency jumps back to normal when it's toggled. However, you have to hit the prop deice every now and then to remove the next load of ice. The other prop deice emulates a prop heater. Turn it on and Prop efficiency slowly improves as the ice melts off. This doesn't have to be toggled. Then, there is airframe deice, which reduces the weight of the AC as ice melts off (this is only a small load) and brings the aerodynamic surfaces back to normal function. With the defective deice switches in some of the MS AC, and the difficulity of telling the difference between wing and airfoil ice, I've had to watch elements of performance with AFSD, or my own XML test gauges to see what's happening. Of course, there is also Carb Heat and pitot heat. RAF

Airframe icing in FS? That's a new one on me! Sure you're not imagining it?

>>>>Airframe icing in FS? That's a new one on me! Sure you're not imagining it?<<<http://forums.avsim.net/dcboard.php?az=sho...pe=search#12626If you have AFSD you can see the effect airframe icing has on the aircraft (weight, lift coefficient etc.), but on the heavy jets it has been my experience that airframe ice has little effect on the flight characteristics in cruise, and you won't notice any difference unless you are using a test gauge or AFSD to monitor things. Some time ago I briefly tested icing effects with the FS9 MS 737-400, but right in the middle of my carefully controlled experiment I found that the weather would change to bright sunshine and fair weather cumulus from the really heavy snow and severe icing that I had set up, even with the rate of change slider set to 'none'. So I tried flying a hold hoping I wouldn't fly out of my user defined bad weather but after several laps around the track it went back to bright and sunny again and I quit in disgust. AFSD was reporting over 3800 lbs of ice weight after about 20 minutes flight time. A more dedicated and patient reseacher than I would have persisted and tried a stall series or a landing to test the effects of all that ice on the aerodynamics, but I just didn't want to deal with the buggy weather settings!Douglas

Try the MAAM-SIM DC-3!Mark "Dark Moment" Beaumonthttp://www.swiremariners.com/newlogo.jpg

Thanks for the detailed replies. I won't bother about de-icing then. Pitot I was aware of as the airspeed indicator often goes dead when its cold out.Speed.

Yup! You are right. I set up a flight in the stock King Air with: +SHRA OVCTS -08/-07 with the severe icing option on. Sure enough the speed reduced until I stuck anti-icing on. This does not show up in the payload diag though. Did the same in the baron and mooney, they just fell out of the sky - LOL! The Mooney couldn't even take-off in fact whereas, the Baron just got slower and slower. Anti-ice makes no difference on the Baron. This maybe realistic because they are not cleard for icing in RL in the UK and the conditions I setup are about the worst possible conditions for icing. Not sure what the systems on the King Air are in RL (prolly hot bleed air from the compressor), but they are pretty effective in the sim.Apologies and thanks for the heads up.I just wish it was smoother in general :(

>>>>>Airframe icing in FS? That's a new one on me! Sure you're>not imagining it?<<<<>>If you have AFSD you can see the effect airframe icing has on>the aircraft (weight, lift coefficient etc.), but on the heavy>jets it has been my experience that airframe ice has little>effect on the flight characteristics in cruise, and you won't>notice any difference unless you are using a test gauge or>AFSD to monitor things. >>Some time ago I briefly tested icing effects with the FS9 MS>737-400,Does AFSD work with FS9? The description lists only 2000 and 2002 for the file here on avsim.* Orest

>>>>Does AFSD work with FS9? The description lists only 2000 and 2002 for the file here on avsim.<<<http://perso.wanadoo.fr/hsors/FS_Soft/afsd.htmlfor AFSD. Latest is v2.44 for FS2002 and FS2004.You will need FSUIPC (unregistered) installed in the FS9 modules folder for AFSD to work. FSUIPC is available here:http://www.schiratti.com/dowson.htmlHave fun!Douglas

Douglas,Thanks much, got it. Icing is very real indeed, took up a 172 under severe icing conditions, and after about 100 lbs of ice the thing just about fell out of the sky.Is there a "gauge" that someone wrote that alerts you to icing, it would be nice if you could interface ASFD somehow. I run full screen and get major hangs (CTD and big red button time) if I try alt-enter back and forth.

>>>>Is there a "gauge" that someone wrote that alerts you to icing, it would be nice if you could interface ASFD somehow.<<<>>>I run full screen and get major hangs (CTD and big red button time) if I try alt-enter back and forth.<<<

>>>>>>This is how I use AFSD:>>I start FS9, then select and load the aircraft I want. When>the aircraft loads and is on the runway or ramp I minimize FS9>to a small window. That would work, as long as I remained in a windowed (full screen or otherwise) mode instead of non-windowed full screen. Once I have a full screen up I cannot reliably either Alt-Esc out or Alt-Enter to windowed mode and back.Do you find much of a hit on frame rate running in windowed mode?

>>>>Once I have a full screen up I cannot reliably either Alt-Esc out or Alt-Enter to windowed mode and back.<<<>>>Do you find much of a hit on frame rate running in windowed mode?<<<

>>>>>Once I have a full screen up I cannot reliably either>Alt-Esc out or Alt-Enter to windowed mode and back.<<<<>>I've read somewhere that the problem you describe is video>card or driver related.>I have no doubt of that. I've been fiddling with drivers and driver setting, without good success thus far.> running MSFS in a window results in better>frame rates for me. When I switch back to full screen>1280x1024x32 I see a decrease of 3-4 FPS (slider set at>unlimited).Really?? That seems illogical, though I have no reason to question your results, and it is easy to test. It would make a lot of things easier for me.* Orest