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12-16-2011, 11:48 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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how hot are the newer pitots?
I'm making my own heated pitot for the rocket which I finished machining last night. Only thing I have left is to make a heating element. I have a AN5814 pitot on my -6 that I'm going to check the temperature of, but as I recall they heat to a level thats way overkill and the newer heated pitots such as the Dynon don't get that hot. Can anyone tell me how hot is hot for one of the newer pitots, like when turning the unit on at ambient what the temp rise is?
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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
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-16-2011, 02:56 PM
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Join Date: Feb 2007
Location: Bradenton, fl
Posts: 89
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Wow, I thought your thread said "How hot are the new Pilots
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Chuck O
TSP
RV-7A (sold)
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12-16-2011, 03:04 PM
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Join Date: Jan 2005
Location: Atlanta, GA
Posts: 2,295
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Have you seen this reference from 'Lectric Bob?
http://www.aeroelectric.com/articles...erformance.pdf
It appears to contain the information you're looking for.
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"What kind of man would live where there is no daring? I don't believe in taking foolish chances but nothing can be accomplished without taking any chance at all." - Charles A. Lindbergh
Jamie | RV-7A First Flight: 7/27/2007 (Sold)
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12-16-2011, 03:08 PM
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Join Date: Jan 2005
Location: Atlanta, GA
Posts: 2,295
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"What kind of man would live where there is no daring? I don't believe in taking foolish chances but nothing can be accomplished without taking any chance at all." - Charles A. Lindbergh
Jamie | RV-7A First Flight: 7/27/2007 (Sold)
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12-16-2011, 03:12 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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Yes I have but judging by the current draw from looking at the Dynon (10A) its heating up the pitot significantly less than a 5814.
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Please don't PM me! Email only!
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
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-18-2011, 08:20 AM
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Join Date: Nov 2009
Location: SFO Approach
Posts: 204
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Quote:
Originally Posted by cbo111
Wow, I thought your thread said "How hot are the new Pilots
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lol, me too |
12-18-2011, 09:56 AM
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Join Date: Nov 2010
Location: BC Canada
Posts: 216
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melting pitot cover
Hot enough to melt a vinyl pitot tube cover. Don't ask me how I know...
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Mike
RV-6 emp, done-sold,
RV7A QB. Passed pre-cover and sold!
Disclaimer: Everything I say can be presumed to be wrong. Don't try this at home. 
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12-19-2011, 07:24 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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Over the weekend I had a non-pilot friend over at the hangar and showed him the heated pitot I made. As soon as I said the word "pitot" he started cracking up thinking I said something else....
Anyway...
I don't think these things need to be hot enough to melt plastic to get the job done so I'm aiming for 250 deg F.
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Please don't PM me! Email only!
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
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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12-21-2011, 10:43 AM
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Join Date: Nov 2010
Location: BC Canada
Posts: 216
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Pitot cover melting
The pitot cover actually started to melt with the pitot heat having been turned off quite a while before. Just putting the airplane to bed and had been on in flight, parked the airplane and didn't wait long enough for it to cool down before putting the cover on and it started to melt! ooops.
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Mike
RV-6 emp, done-sold,
RV7A QB. Passed pre-cover and sold!
Disclaimer: Everything I say can be presumed to be wrong. Don't try this at home.
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12-21-2011, 11:26 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Thinking Out Loud...
No experience with heated pitot tubes, just an instrumentation engineer thinking out loud:
Do the newer units like the Dynon use temperature feedback (from an embedded sensor) to regulate the tempurature, or do all of them just run "wide open" all the time? With feedback control I wouldn't think you'd have to run it more than 40 - 50F, anything above freezing with a little margin to handle rapidly decreasing OAT. You might also want some kind of bypass in the event of failure of the feedback circuitry, maybe an OFF/AUTO/ON switch. Display the feedback temp on an EIS, maybe?
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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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