Do you know what it is yet
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Do you know what it is yet
A while back there was a thread similar. Can't find it. Please suggest a merge.
Took this photo today. I found it interesting anyway. No clues yet. Oh it is Mil A/C related and in the UK
Drag
Took this photo today. I found it interesting anyway. No clues yet. Oh it is Mil A/C related and in the UK
Drag
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It's a "polyvalent" particle separator, as fitted to protect the intakes of turbine engines. Often fitted to helicopters, the Puma being the first UK military recipient, in the late 1970s.
Centrisep particle separator.
Sand filter, particle separator, internal design of each tube swirls the incoming air and centrifugal force throws impurities out of the airflow that goes on through to the compressor of the turbine.
Sand filter, particle separator, internal design of each tube swirls the incoming air and centrifugal force throws impurities out of the airflow that goes on through to the compressor of the turbine.
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OK John, They appear to be particle separators to prevent the ingress of sand /dust. (the stuff my boy was covered in when he returned from Bastion)I could not work out where the dust goes. I just did not expect to see this type of device in this application. I could not see what was on the other side of the panel. perhaps there was some type of collection chamber.
It was meant to be a bit of fun.
Anyone know the aircraft type?
I was playing with cyclones back in 1978 (not aircraft) and also investigating the use of them now to remove sediment from fluids.
It was meant to be a bit of fun.
Anyone know the aircraft type?
I was playing with cyclones back in 1978 (not aircraft) and also investigating the use of them now to remove sediment from fluids.
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Almost
Almost got it Coff,
I just thought it was quite novel, like many of the features on this air vehicle.
When I first saw these things I thought they may be adjustable like punkah louvers. The vanes are fixed. I did not know if they had some EMC role. Did they come out of the Melksham design stable? Do they feature on any other air vehicle.
I just thought it was quite novel, like many of the features on this air vehicle.
When I first saw these things I thought they may be adjustable like punkah louvers. The vanes are fixed. I did not know if they had some EMC role. Did they come out of the Melksham design stable? Do they feature on any other air vehicle.
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Spot on heli
Spot on Heli, I was invited to Mildenhall to look over these things today. Great bunch of guys at 7th SOS, let us climb all over inside and out and take pictures.
The coffee was not up to much!!
What I could not work out was where the dust finished up or was ejected. I expected to see some by pass duct outlet from a plenum. I could not find the fan.
I was fascinated by the blade fold mechanism. Another interesting thing for me was the amount of electric cable running between the frames. Also the lack of hydraulic oil and fuel leaks. Lacked the smell I had expected.
The coffee was not up to much!!
What I could not work out was where the dust finished up or was ejected. I expected to see some by pass duct outlet from a plenum. I could not find the fan.
I was fascinated by the blade fold mechanism. Another interesting thing for me was the amount of electric cable running between the frames. Also the lack of hydraulic oil and fuel leaks. Lacked the smell I had expected.
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I remember the Puma sand filters but not the plastic moulded inserts.
Looks like the HC2 still has them, but the "bin lid" blanking covers are fitted in this photo. The HC1 originally had movable "bullets" which moved, also powered by P2 air, when the system was switched on, blocking the direct intake. This forced air to enter the intakes via the polyvalent panels.
File:Aerospatiale SA330 Puma HC1 1 (3758170908).jpg - Wikimedia Commons
Edit: The separator panels / complete modules are double skinned. The end of the tubes go straight through both panels. The outer shell of the particle separator terminates inside the compartment formed by the two panels. If you look at the larger of the two diagrams above, posted by John Eacott, you might notice the "O" ring where the separator fits into a hole in the inner panel.
Last edited by ShyTorque; 31st Mar 2015 at 22:22.
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Seem to remember the HC1 version when first used in Norway icing up, the bullet promptly motored back and the engine then sucked the said ice through 
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Nutty, I think that's when the "bin lids" were permanently fitted. This increased engine fuel flow to "even more horrendous".
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What is it ?
My pills come in foil "leaves" which look just like that. Each has its own personality: Atorvastatin comes out with the velocity of a rifle bullet, can easily carry the length of my 30ft lounge unless restrained.
Just thought I'd mention it.
D.
Just thought I'd mention it.
D.
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Shy Torque, when you look at the Puma and Chinook air filters, I often wonder if a WW2 design would have worked both cheaper and as effectively, it was designed, built and test flown ( to address a problem with the Typhoon ) in under 10 hours!
see
Cecil Lewis Cowdrey - David Cowdrey
"Hawker Typhoons and Tempests were then operating from temporary landing strips on the Normandy beachhead and the Napier Sabre II engines were suffering from excessive wear due to the dust carried up by the propellers from the landing strip during take off.
A ‘Momentum’ type air cleaner was then designed by Mr Cecil Cowdrey and Mr Bonar, which operated on the deflection principle and was produced in large numbers in Luton and flown directly to the Squadrons operating in France. It had a filtering capacity of 96% and prolonged the life of the engine many times over, without seriously affecting the power output."
see
Cecil Lewis Cowdrey - David Cowdrey
"Hawker Typhoons and Tempests were then operating from temporary landing strips on the Normandy beachhead and the Napier Sabre II engines were suffering from excessive wear due to the dust carried up by the propellers from the landing strip during take off.
A ‘Momentum’ type air cleaner was then designed by Mr Cecil Cowdrey and Mr Bonar, which operated on the deflection principle and was produced in large numbers in Luton and flown directly to the Squadrons operating in France. It had a filtering capacity of 96% and prolonged the life of the engine many times over, without seriously affecting the power output."
