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12-21-2011, 02:00 PM
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Join Date: Jul 2005
Location: Denver, CO
Posts: 295
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The Dynon unit does sense the temperature and pull higher draw to heat up but then levels out to maintain the temperature it wants. Not sure what that is or how it does it, but that's what the manual says!
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// corey crawford
// rv-7a (sold)
// denver, co @ KBJC
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12-21-2011, 02:40 PM
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Join Date: Jul 2009
Location: Longmont, CO
Posts: 236
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An AN5812 pitot will get hot enough to melt solder if turned on without any airflow. I imagine an AN5814 will do the same thing. Not sure what the ultimate temperature limit is in still air, but it's probably not a good idea to leave one on without air cooling. If the Dynon tube regulates the temperature to match the demand, this is a good thing - in safety and also in power consumption.
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Mark Olson
RV-7A First flight 2005 Sold 2019
F1-EVO Rocket First flight 2010
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12-21-2011, 04:55 PM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Quote:
Originally Posted by ccrawford
The Dynon unit does sense the temperature and pull higher draw to heat up but then levels out to maintain the temperature it wants. ...
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Any idea what that temperature is?
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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12-21-2011, 05:36 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Quote:
Originally Posted by molson309
An AN5812 pitot will get hot enough to melt solder if turned on without any airflow. I imagine an AN5814 will do the same thing. Not sure what the ultimate temperature limit is in still air, but it's probably not a good idea to leave one on without air cooling. If the Dynon tube regulates the temperature to match the demand, this is a good thing - in safety and also in power consumption.
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Yes as I recall the wires in the 5812 are silver soldered. Maybe the things need to be at the same core temperature as the sun if one wants to melt a foot of snow off of it in a few nanoseconds. But, I think since I'll be a little more proactive when theres a chance of encountering icing conditions I think 250 deg. F is more than adequate. Unless someone can convince me otherwise...
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
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Not a thing I own is stock.
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02-13-2012, 09:49 PM
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Join Date: Dec 2011
Location: Medford, Oregon
Posts: 73
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Pitot Heat Iced over
Well, I do know my pitot tip iced over while heat was ON and I lost AS. If it was during VFR, no biggie, however, it was IMC and I'm still picking seat cushion out!  wasn't expecting to loose speed indication-was ready for ice on the RV and had an escape plan though. Diverted to VFR conditions and after a few minutes AS came back. Err on the HOT side is my suggestion.
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02-14-2012, 07:02 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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It only needs to be above freezing, but it's got to stay that hot while shedding heat into basically an ice water environment, with the water being changed at 200 mph. It's not the temperature, it's how much energy it takes to maintain that temperature.
Radiators can freeze in cars even while driving....
Charlie
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02-15-2012, 10:47 AM
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Join Date: May 2009
Location: KS
Posts: 110
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It needs to be hot enough to remove ice as well as prevent ice buildup. It will take significantly more heat to remove ice than it will to prevent ice. Err on the hot side.
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