OAT gauge - static or moving air?
Guest
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On the other end HP, if it gets wet (rain) in the open airflow the probe cools due to evaporation and thus the temp indication can be considerably lower.
We had this problem on the CF6 engines where flying through rain fouled up the Compressor Inlet Temperature sensor which in turn fouled up the Main Engine Control causing loud bangs and lots of flames. Great way to make people wet in a closed cockpit.
Sq
We had this problem on the CF6 engines where flying through rain fouled up the Compressor Inlet Temperature sensor which in turn fouled up the Main Engine Control causing loud bangs and lots of flames. Great way to make people wet in a closed cockpit.
Sq
Guest
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The potential for cooling of the probe due to evaporation of water droplets was pretty much uppermost in my mind when I posted the question as I figured temperature rise due to compressibility would be practically negligable at 85kts IAS.
Looks like I need to have dynamic air-flow with some sort of water-trap to minimise accretion of liquid water on the probe. Actually, since the aircraft has an open cockpit, rain avoidance is a high priority anyway, meaning a reduced chance of liquid water gaining access to the probe in the first place.
I'll see if I can design/make a shroud to trap water but permit a resonably dynamic flow of air.
Appreciate all the help from fellow Ppruners.
Regards
Looks like I need to have dynamic air-flow with some sort of water-trap to minimise accretion of liquid water on the probe. Actually, since the aircraft has an open cockpit, rain avoidance is a high priority anyway, meaning a reduced chance of liquid water gaining access to the probe in the first place.
I'll see if I can design/make a shroud to trap water but permit a resonably dynamic flow of air.
Appreciate all the help from fellow Ppruners.
Regards
Guest
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Point taken,
Well, I just flew a Duchess this morning, and its temp probe sticks straight into the airflow into the rain (and yes it was raining!). So maybe it doesn't make enough difference in a lighty for it to matter? In a CF6 on the other hand I'm sure its quite a consideration!
Well, I just flew a Duchess this morning, and its temp probe sticks straight into the airflow into the rain (and yes it was raining!). So maybe it doesn't make enough difference in a lighty for it to matter? In a CF6 on the other hand I'm sure its quite a consideration!
Guest
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Ahah! Looks like I should get my little lathe out and machine an open-ended tube,put an umbrella/deflector at the front, mount it facing straight into the relative airflow, place the probe inside it and add some side-holes. Should work just fine.
Again many thanks to all for the help.
Again many thanks to all for the help.