JameLi1986
Banned Member
As a new guy I can't post links. Please go to see the full video explanation on youtube please:
search this title: causes of F-22 oxygen problem have been found
Since the crash of F-22 in Alaska in November 2010. The mysterious oxygen supply problem is so far still a mystery. No one know what the real causes is. It takes the Lockheed, Honeywell, and USAF 2 years to not identify the real causes. And now it took me 3 minutes to do the job.
About 20 days ago. Two F-22 pilots talked on 60 minutes about this problem. After I seen the video. Instantly I found the real causes of the F-22’s oxygen problem and made some posts on my Google plus on May 8, 2012.
Now Iet me explain to you in detail about my theory.
let’s first take a look of these facts:
1.
The same sort of OBOGS made by Honeywell on other platforms performs ok. These platform according to their company catalog Including : Eurofighter ; F-35 ; BAE HAW ; BAE/SAAB gripen; F-18; PILATUS PC-21; Nimrod MRA MK4 ; Harrier; F-14; B-1B; B-2B.
So why other aircraft have no oxygen problem and the F-22 does?
The answer is clear: They are all not designed to fly at high altitude. They can’t perform violent maneuver at high altitude like F-22 dose. Especially the high AOA, low speed and post stall maneuver.
At high altitude. The air is so thin. Without sufficient air-speed to draw more air into the engine the engine is simply getting under charged. And the bleed air from the engine compressor goes for the OBOGS is under-pressurized. This will cause the OBOGS to malfunction and do not producing sufficient oxygen. And will also possibly cause the cabin pressure to drop. Because the bleed air is also be used to pressurize the cabin. Unlike civil air-liner. Fighter jets cabin pressurization is not maintained constant—pressure differential mode; At high altitude in the thin air. Cabin pressure drops and oxygen in-sufficient together with the increase oxygen demand of pilot due to violent aerobatics may works together to cause hypoxia that will endanger the flight.
The OBOGS system is a physical gas separation device, It use the selective absorption property of molecular sieve to separate oxygen and nitrogen in the air. Producing enriched oxygen for the pilot to breath.
The technology is called pressure swing adsorption (PSA). It relies on the pressure changes of air to let the zeolites absorbing specific gas then release to produce enriched oxygen and/or nitrogen.
to make the OBOGS work and deliver required oxygen enriched air. The input air must have enough pressure to generate a big enough pressure swing. At low altitude this is OK no matter how the airplane maneuvers. But the F-22 is designed to fly at high altitude where air is very thin. Normally when the plane flying fast. With the air ramming effect the engine will produce bleed air with enough pressure.
But when the plane fly at low speed at that altitude. especially when doing post stall maneuvers. Without the air ramming effect the engine is simply getting under-charged.
Now you see. High altitude slow flight is the single most important contributing factor of the mysterious oxygen problem of the F-22 raptor.
2.
Not every F-22 flight will cause the pilot to suffer from hypoxia. the incidents happens occasionally, unpredictable, and often time the pilot doesn’t even notice it.
Reason for this?
Simple. Not every flight they will perform low speed high altitude maneuver.
3.
the 2 pilots talked on 60 minutes says most of them is having the so called raptor cough and is spitting black sputum with charcoal dust.
This is because the frequent high altitude flight doing low speed violent maneuver. They been constantly suffer from lack of oxygen and exposure to low cabin pressure. Even worse is these violent maneuver make the pilot to consume much much more oxygen. The charcoal problem is a stupid engineering fault. Even idiots know how to handle the filter’s charcoal problem. Just add some fiber based filter. Like PP cotton and non-woven fabric
This week some report says there also been found some problem of possible cooling liquid infiltration and BRAG valve malfunction. Since I know only limited information about the inside of the OBOGS of F-22 I am not sure whether this could also be the contributing factors.
To identify the real causes and prove my theory. Please do the following thing:
1. Equip the F-22 with oxygen tanks or chemical oxygen generator or other sort of oxygen generating systems that do not depend on bleed air.
2. Install pressure sensor in the cabin, and gas percentage reading sensor in the mask and the cabin. All these data shall be recorded every single seconds.
3. get the F-22 back into the air, Doing slow flight and post stall maneuver at high altitude. If my theory is right. The sensor records will tell the entire story.
4. after prove my theory is right. Do the following thing
A: Add another stage of electric compressor the provide more air pressure for the OBOGS.
B: An oxygen tank is needed as backup oxygen supply in case the OBOGS fail.
I am 100% sure about my theory. And hope it will help in someway.
search this title: causes of F-22 oxygen problem have been found
Since the crash of F-22 in Alaska in November 2010. The mysterious oxygen supply problem is so far still a mystery. No one know what the real causes is. It takes the Lockheed, Honeywell, and USAF 2 years to not identify the real causes. And now it took me 3 minutes to do the job.
About 20 days ago. Two F-22 pilots talked on 60 minutes about this problem. After I seen the video. Instantly I found the real causes of the F-22’s oxygen problem and made some posts on my Google plus on May 8, 2012.
Now Iet me explain to you in detail about my theory.
let’s first take a look of these facts:
1.
The same sort of OBOGS made by Honeywell on other platforms performs ok. These platform according to their company catalog Including : Eurofighter ; F-35 ; BAE HAW ; BAE/SAAB gripen; F-18; PILATUS PC-21; Nimrod MRA MK4 ; Harrier; F-14; B-1B; B-2B.
So why other aircraft have no oxygen problem and the F-22 does?
The answer is clear: They are all not designed to fly at high altitude. They can’t perform violent maneuver at high altitude like F-22 dose. Especially the high AOA, low speed and post stall maneuver.
At high altitude. The air is so thin. Without sufficient air-speed to draw more air into the engine the engine is simply getting under charged. And the bleed air from the engine compressor goes for the OBOGS is under-pressurized. This will cause the OBOGS to malfunction and do not producing sufficient oxygen. And will also possibly cause the cabin pressure to drop. Because the bleed air is also be used to pressurize the cabin. Unlike civil air-liner. Fighter jets cabin pressurization is not maintained constant—pressure differential mode; At high altitude in the thin air. Cabin pressure drops and oxygen in-sufficient together with the increase oxygen demand of pilot due to violent aerobatics may works together to cause hypoxia that will endanger the flight.
The OBOGS system is a physical gas separation device, It use the selective absorption property of molecular sieve to separate oxygen and nitrogen in the air. Producing enriched oxygen for the pilot to breath.
The technology is called pressure swing adsorption (PSA). It relies on the pressure changes of air to let the zeolites absorbing specific gas then release to produce enriched oxygen and/or nitrogen.
to make the OBOGS work and deliver required oxygen enriched air. The input air must have enough pressure to generate a big enough pressure swing. At low altitude this is OK no matter how the airplane maneuvers. But the F-22 is designed to fly at high altitude where air is very thin. Normally when the plane flying fast. With the air ramming effect the engine will produce bleed air with enough pressure.
But when the plane fly at low speed at that altitude. especially when doing post stall maneuvers. Without the air ramming effect the engine is simply getting under-charged.
Now you see. High altitude slow flight is the single most important contributing factor of the mysterious oxygen problem of the F-22 raptor.
2.
Not every F-22 flight will cause the pilot to suffer from hypoxia. the incidents happens occasionally, unpredictable, and often time the pilot doesn’t even notice it.
Reason for this?
Simple. Not every flight they will perform low speed high altitude maneuver.
3.
the 2 pilots talked on 60 minutes says most of them is having the so called raptor cough and is spitting black sputum with charcoal dust.
This is because the frequent high altitude flight doing low speed violent maneuver. They been constantly suffer from lack of oxygen and exposure to low cabin pressure. Even worse is these violent maneuver make the pilot to consume much much more oxygen. The charcoal problem is a stupid engineering fault. Even idiots know how to handle the filter’s charcoal problem. Just add some fiber based filter. Like PP cotton and non-woven fabric
This week some report says there also been found some problem of possible cooling liquid infiltration and BRAG valve malfunction. Since I know only limited information about the inside of the OBOGS of F-22 I am not sure whether this could also be the contributing factors.
To identify the real causes and prove my theory. Please do the following thing:
1. Equip the F-22 with oxygen tanks or chemical oxygen generator or other sort of oxygen generating systems that do not depend on bleed air.
2. Install pressure sensor in the cabin, and gas percentage reading sensor in the mask and the cabin. All these data shall be recorded every single seconds.
3. get the F-22 back into the air, Doing slow flight and post stall maneuver at high altitude. If my theory is right. The sensor records will tell the entire story.
4. after prove my theory is right. Do the following thing
A: Add another stage of electric compressor the provide more air pressure for the OBOGS.
B: An oxygen tank is needed as backup oxygen supply in case the OBOGS fail.
I am 100% sure about my theory. And hope it will help in someway.
