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  #11  
Old 12-21-2011, 02:00 PM
ccrawford ccrawford is offline
 
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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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  #12  
Old 12-21-2011, 02:40 PM
molson309 molson309 is offline
 
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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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  #13  
Old 12-21-2011, 04:55 PM
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longranger longranger is offline
 
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Quote:
Originally Posted by ccrawford View Post
The Dynon unit does sense the temperature and pull higher draw to heat up but then levels out to maintain the temperature it wants. ...
Any idea what that temperature is?
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  #14  
Old 12-21-2011, 05:36 PM
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rocketbob rocketbob is offline
 
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Quote:
Originally Posted by molson309 View Post
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.
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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  #15  
Old 02-13-2012, 09:49 PM
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Rotorheadrob Rotorheadrob is offline
 
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Default 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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  #16  
Old 02-14-2012, 07:02 PM
rv7charlie rv7charlie is offline
 
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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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  #17  
Old 02-15-2012, 10:47 AM
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LeeM_2000 LeeM_2000 is offline
 
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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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