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12-31-2012, 08:43 AM
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Join Date: Feb 2009
Location: Brooksville
Posts: 282
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Moisture Effects
On a trip not long ago I took some screenshots showing the the TAS speed change while flying through high moisture air (clouds) and dry air (clear).
The first one is after about 30min of flight level in smooth IMC conditions.
This one is about 20 min latter after flying in clear air and drying the airframe off.
There are some subtle differences in, DA, MAP, CHT, EGT, FF, etc. but from the time the first shot was taken and the second shot there was no change in the power, prop or mixture settings.
Note the True Air Speed difference. 
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Weasel
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Last edited by Wesael : 12-31-2012 at 01:10 PM.
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12-31-2012, 08:48 AM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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Very interesting, thanks for sharing that.
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12-31-2012, 12:41 PM
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Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,814
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seems that the clouds act like brakes
Your indicated airspeed is reduced in the clouds. It seems that the clouds act like brakes however I don't recall this happening in a Cessna at 110 kts. OK, I'll bite, why is this?
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Steve Melton
Cincinnati, OH
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01-01-2013, 07:26 AM
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Join Date: Sep 2009
Location: Daytona Beach, Florida
Posts: 121
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True airspeed
The true airspeed calculation requires an OAT input, which I don't see in your screenshot. TAS will vary with OAT.
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01-01-2013, 07:39 AM
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Join Date: Mar 2009
Location: Grand Rapids, MI
Posts: 1,004
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OAT is displayed in the lower right hand corner.
I noticed several suttle changes in several data points besides the OAT, wind direction and velocity, altitude, fuel burn rate, etc. are these changes the result of atmosphic changes or something induced by performance or pilot changes?
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Paul K
West Michigan
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01-01-2013, 08:29 AM
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Join Date: Apr 2007
Location: Norway, Stj?rdal
Posts: 598
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IAS and TAS increased 8.5%. GS increased 11.5%. You flew straight and level in a slight downdraft and entered calm air or slight updraft and a tailwind. With the same power setting you will go faster. Rain will also slow you down.
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01-01-2013, 08:31 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,523
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Look at the pitch bars.
I think it's just a case of rising or falling air mass.
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Dan Horton
RV-8 SS
Barrett IO-390
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01-01-2013, 08:44 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,775
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I guess I'm missing something, but it looks to me like the nose is below the horizon in the second picture. Doesn't take much of a "dive" to increase airspeed.
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
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RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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01-01-2013, 09:04 AM
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Join Date: Jan 2005
Location: Kansas
Posts: 384
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The nose is pointing down more however there is no indication of negative vertical speed? As speed increases the nose lowers, is this the case here? Not sure at these speeds if there would be a huge pitch change though.
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01-01-2013, 09:28 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,569
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Unrelated to this topic but man all that stuff on the left makes my head hurt. You'd think that some of the EFIS manufacturers could use UI-design inspired by an iPhone.
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Bob Japundza CFI A&PIA
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