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PostPosted: Mon Dec 03, 2018 10:01 am 
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Airman First Class

Joined: Tue Oct 23, 2012 7:23 am
Posts: 83
Location: Marburg (Germany)
To check out the new rain effects in P3D i did a Texan ride with the standard bad weather setting of P3D (V4.3). Shortly after takeoff i ve noticed a significant loss of power but managed an landing outside the airfield. The Hangar didn‘t show any damage on the Engine. Second flight, same result but a few minutes later...

I ve done hundred of flights (most of the time in good weather) but never faced these problems. Any suggestions what could cause this behavior?


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PostPosted: Mon Dec 03, 2018 10:10 am 
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Master Sergeant

Joined: Tue Nov 05, 2013 10:48 am
Posts: 1484
Location: Oksbøl, Denmark
sounds like carb ice. Did you apply the carb heat?

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Accu-Sim aircraft in my hangar:
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PostPosted: Mon Dec 03, 2018 5:00 pm 
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Airman First Class

Joined: Tue Oct 23, 2012 7:23 am
Posts: 83
Location: Marburg (Germany)
Thanks for the idea, carb heat wasn´t on my mind. I will give it a try, but as the rpm also drops, i am almost sure it isn´t an icing issue.


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PostPosted: Mon Dec 03, 2018 5:49 pm 
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Chief Master Sergeant
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Joined: Mon Sep 02, 2013 7:30 pm
Posts: 3465
Location: Typically hanging around N07, 12N, KLDJ, KCDW
Carb icing will lead to an RPM drop when the engine has lost a significant amount of power and the prop has reached the high rpm limit stop.

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PostPosted: Mon Dec 03, 2018 6:44 pm 
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Senior Airman
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Joined: Sun Aug 16, 2015 8:00 am
Posts: 232
I set custom weather in ASP4, without worrying to much about temp and dew point and I had same issue when I started testing rain effect. Carb icing is the issue here almost certainly. You can test for this, as I did, by selecting the carb heat and then waiting for that manifold pressure to start rising again.

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PostPosted: Mon Dec 03, 2018 8:57 pm 
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Joined: Sun Nov 30, 2014 12:27 pm
Posts: 1022
The Comanche is especially sensitive to carb icing, and A2A modeled this characteristic with a vengeance. I remember YouTube video of a flight through moisture-filled clouds somewhere in the Eastern USA, right after the A2A Comanche came out. Our intrepid A2A Comanche pilot took off and climbed through some cloud, failing to notice a gradual loss of manifold pressure. Eventually he went past the point of no return, where the engine actually quits, and there's not enough heat to get it going again. He was lucky enough to find a runway dead ahead as he popped out of the clouds. Airplane had to be towed into a hangar and the carb inlet heated with a heat gun. Better than a fiery crash.

Looks like the Six is almost as bad. The Six teaches you to land. The Comanche teaches you to check MP whenever you even see a cloud.

Seeya
ATB

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PostPosted: Tue Dec 04, 2018 4:44 pm 
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Airman First Class

Joined: Tue Oct 23, 2012 7:23 am
Posts: 83
Location: Marburg (Germany)
Carb heat solved the problem, thanks everyone!


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