That's good then, at least the fix works in favor of performance.

In all these years, I've never noticed an FSX carb heat issue (bug), or known anything about hitting the "H" key. Since the mountains right next to my home are over 11,000' msl...............I'm always sim flying higher than that. For my purposes, leaning the mixture has always taken care of engine/power output.

So............how have I been missing this "bug"? Unless it IS totally weather related.

 

L.Adamson

Ive not seen the bug either just lean the mixture hehe

I love the Lancair it's the only plane I fly now

Ive not seen the bug either just lean the mixture hehe

 

The problem has nothing to do with mixture or proper leaning.

 

Scott

It's about the weather conditions you fly in, it has nothing to do with mixture. If the temperature is in the right range (usually 0 to 10C) AND there is enough moisture in the air then you are likely to get carb icing conditions. If all you do is fly at low level in high temps then you never will see this bug.

I frequently fly to 175 in northern MN... I've never seen the bug - I get it has nothing to do with mixture just a late night comment I attached to my post

Hi there! After a couple of successful flights in this beautiful add on, I can only say that it really might be the best GA plane around right now. All the details and sounds make it so alive and a pure joy to fly! Unfortunately, the impact on the frames is quite high on my old system. Compared to the Turbine Duke or the Milviz B55, my frames tend to jump quite violently from 12-35 more or less all the time, especially over denser sceneries. But since I will get a new Ivy Bridge (or Sandy Bridge) system in the nearer future, it doesn't bother me too much. The look and feel is really absolutely immersive! Now I am really looking forward to the upcoming RA C172! ;-)

I get it has nothing to do with mixture just a late night comment I attached to my post

 

Sorry - don't mean to be humorless, but I interpreted the "hehe" incorrectly. Heh, heh. :-)

 

Scott

When I power on the fuel pump before start, shouldn't I expect to see the fuel pressure rise?

It's about the weather conditions you fly in, it has nothing to do with mixture. If the temperature is in the right range (usually 0 to 10C) AND there is enough moisture in the air then you are likely to get carb icing conditions. If all you do is fly at low level in high temps then you never will see this bug.

 

I'm very aware of real life icing conditions. I'm also aware of the difference in the use of carb heat between Lycoming and Continental engines, due to placement of the carburetor. The Lyc pulls air through the oil heated sump, to which the carb is mounted, and the Continental doesn't. That's why you see variations in the POH between older Cessnas (Continentals) which always call for carb heat on landing, while Pipers don't. But, never the less, I still haven't seen this in FSX.

 

L.Adamson

When I power on the fuel pump before start, shouldn't I expect to see the fuel pressure rise?

 

How do you have your mixture set?

Push it in and it will rise.

Well spotted Chuck that was it, thank you, great attention to detail.

DIscussed already in this very thread. It's the old FSX carb heat issue. No, there isn't a carb on this plane, nor, of course, a carb heat control - yes, FSX acts like there is a carb. You've already found the solution.

Impact Ice*:

Even fuel injected engines can suffer from ice buildup in the air intake venturi. This is formed by the impact of moist air at temperatures between -10°C and 0°C on air scoops, throttle plates, heat valves, etc. Usually forms when visible moisture such as rain, snow, sleet, or clouds are present. Most rapid accumulation can be anticipated at -4°C. This type of icing can also affect fuel injection systems as well as carburetor systems and is also the main type of icing hazard for turbocharged engines.

 

This quote from an AOPA article** on the issue of icing is informative:

 

Fuel-injected engines have no carburetor and, therefore, no carburetor ice problem. However, when conditions are favorable for structural ice, fuelinjected engines can lose power and even fail if the air filter and intake passages are blocked by ice. (This can also occur in airplanes with carburetors.) At the first sign of power loss, activate the alternate induction air door or doors. When these doors open, intake air routes through them, bypassing the iceblocked normal induction air pathway. Many alternate induction air systems activate automatically; these designs use spring-loaded doors. Suction in an ice-blocked air intake draws these alternate air doors open. Some older fuel-injected airplanes have alternate air doors that must be manually opened. Knobs or levers have to be physically moved to the open position in order for alternate air to reach the engine. Check the POH for your airplane to find out how and when to use this system.

 

So, using H to toggle on "Carb Heat" isn't at all unrealistic with a fuel-injected engine! Only the labeling would change to "Venturi Heat" or some such...

 

*Nota bene: see http://www.skybrary....Induction_Icing

** See also: http://www.aopa.org/...ations/sa11.pdf

Except that this particular plane doesn't have engine anti ice equipment.

 

If the bug is anything like the icing I encounter in other aircraft, in FSX, it also can't easily be avoided by staying clear of clouds. FSX and Activesky seem to consistently over saturate the air you're flying through. If it's cold enough, you're likely to see icing problems crop up.

 

I guess it's a good thing that the carb heat bind works in the background. It's a minimal impact to realism. Real pilots of the Lancair and similar aircraft would avoid flight above the freezing level into clouds. Doing so should reasonably ensure that they won't encounter induction or aiframe icing which they are incapable of clearing due to the lack of anti/de-ice equipment. Unfortunately doing so in FSX doesn't always ensure that you won't freeze up.