Guess the aircraft spare
Discussion
FunkyNige said:
Does all the measuring get done in that thing or does the air get piped elsewhere? And why are there two connectors? I'm assuming the outer two are the bolts.
The air gets piped to an Air Data Computer or equivalent depending on type. I suspect the OP is better at the detail than I am though. 
Shar2 said:
Eric Mc said:
It looks heat discoloured.
That's because they get hot. Really surprisingly hot. They certainly melt the protective boots very quickly, don't ask how I know. 
FunkyNige said:
knight said:
Does all the measuring get done in that thing or does the air get piped elsewhere? And why are there two connectors? I'm assuming the outer two are the bolts.
AndrewGP said:
Shar2 said:
Eric Mc said:
It looks heat discoloured.
That's because they get hot. Really surprisingly hot. They certainly melt the protective boots very quickly, don't ask how I know. 
I've only ever pre-flighted little aircraft and with battery master switched on, by the time I've walked round to check the lights the pitot is luke warm. Wouldn't want to leave it too long before checking though.
Edited by 48k on Tuesday 22 March 16:41
griffdude said:
Mave said:
I'd guess that one connector is for Total pressure, the other is for Static pressure. The difference between them is used to calculate velocity.
The static ports are separate to these & flat to the surface. Usually unpainted too.any idea why it's got 2 connections?
Mave said:
griffdude said:
Mave said:
I'd guess that one connector is for Total pressure, the other is for Static pressure. The difference between them is used to calculate velocity.
The static ports are separate to these & flat to the surface. Usually unpainted too.any idea why it's got 2 connections?
Most "fast" aircraft (200kts+ civil and military) will have pitot probes which heat to 250'c+ and will hit 100'c in a few seconds from switch on which requires a large current draw on the electrical system which can drain the 28v battery quite quickly so newer designs are limited to weight off wheels operation only as by that stage the aircrafts generator/s should be on.
The probes fitted to slower civil prop aircraft (Cessea 172 types) may hit similar temps but take a longer time.
The probes fitted to slower civil prop aircraft (Cessea 172 types) may hit similar temps but take a longer time.
dr_gn said:
Mave said:
griffdude said:
Mave said:
I'd guess that one connector is for Total pressure, the other is for Static pressure. The difference between them is used to calculate velocity.
The static ports are separate to these & flat to the surface. Usually unpainted too.any idea why it's got 2 connections?
Mave said:
dr_gn said:
Mave said:
griffdude said:
Mave said:
I'd guess that one connector is for Total pressure, the other is for Static pressure. The difference between them is used to calculate velocity.
The static ports are separate to these & flat to the surface. Usually unpainted too.any idea why it's got 2 connections?
The newer versions of the Pitot/Static probes have the ADC built into the probe itself so you don't need the hoses any more (no more leaks) as it's a purely electrical signal output to new digital cockpit gauges and whatever Flight Control Computer you're running.
IanH755 said:
Most "fast" aircraft (200kts+ civil and military) will have pitot probes which heat to 250'c+ and will hit 100'c in a few seconds from switch on which requires a large current draw on the electrical system which can drain the 28v battery quite quickly so newer designs are limited to weight off wheels operation only as by that stage the aircrafts generator/s should be on.
The probes fitted to slower civil prop aircraft (Cessea 172 types) may hit similar temps but take a longer time.
Weight off wheels? Sounds like an icing problem waiting to happen...The probes fitted to slower civil prop aircraft (Cessea 172 types) may hit similar temps but take a longer time.
What do I know though.
IanH755 said:
Yeap, the 2nd red blank from the Left is covering the electrical power connector, the taller domed red cover on it's right is the Pitot pipe connection for the hose which goes off to the Air Data Computer and whatever cockpit gauges are being used (ASI/CSI/Mach meter). The hoses go brittle with age and leak and it's a proper git to trackdown all the various minor leaks you find on older aircraft.
The newer versions of the Pitot/Static probes have the ADC built into the probe itself so you don't need the hoses any more (no more leaks) as it's a purely electrical signal output to new digital cockpit gauges and whatever Flight Control Computer you're running.
Got it in one The newer versions of the Pitot/Static probes have the ADC built into the probe itself so you don't need the hoses any more (no more leaks) as it's a purely electrical signal output to new digital cockpit gauges and whatever Flight Control Computer you're running.
these are not repairable so this is a brand new item. When I’m back at work I could probably find a photo of a U/S one and you will be able to see the burning on the tip of the probeknight said:
IanH755 said:
It's model number 0851HL if you want to check on eBay
This one is 0851MC https://www.proponent.com/wp-content/uploads/2018/...
Burrow01 said:
I hope so as this was a direct replacement from the OEM 
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