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Is The V22 Osprey Pressurized?  
User currently onlineMax Q From United States of America, joined May 2001, 4463 posts, RR: 19
Posted (5 years 9 months 2 weeks 5 days ago) and read 9796 times:

Interested to know if this is the case..


The best contribution to safety is a competent Pilot.
18 replies: All unread, jump to last
 
User currently offlineAjd1992 From , joined Dec 1969, posts, RR:
Reply 1, posted (5 years 9 months 2 weeks 4 days 23 hours ago) and read 9795 times:

According to Wiki, the cruise height its FL260.

So in short... yes it is. You couldn't fly that high without being pressurised. Well, not legally anyway (And I don't think you'd want to be on O2 for the whole flight above FL120).


User currently offlineMoose135 From United States of America, joined Oct 2004, 2314 posts, RR: 10
Reply 2, posted (5 years 9 months 2 weeks 4 days 15 hours ago) and read 9697 times:

No, the V-22 is not pressurized. As long as you are on oxygen, you can fly at those altitudes - we used to get up to FL250 in the unpressurized T-37 all the time (well, not all the time, but you know what I mean...) wearing an oxygen mask.


KC-135 - Passing gas and taking names!
User currently offlineUnattendedBag From United States of America, joined Oct 2003, 2326 posts, RR: 1
Reply 3, posted (5 years 9 months 2 weeks 4 days 12 hours ago) and read 9634 times:

http://www.fighter-planes.com/info/v22_osprey.htm

"The aircraft was originally designed to be pressurized, but the rotating wing (for shipboard stowage) makes it difficult to properly seal the cabin. As a result, pilots and aircrew must wear oxygen masks while flying above 10,000 feet (3,000 m). The Osprey uses an on-board oxygen generating system (OBOGS) which enriches ambient air by filtering out the oxygen."



Slower traffic, keep right
User currently offlineHercPPMX From United States of America, joined May 2008, 196 posts, RR: 0
Reply 4, posted (5 years 9 months 2 weeks 4 days 12 hours ago) and read 9618 times:



Quoting UnattendedBag (Reply 3):
http://www.fighter-planes.com/info/v22_osprey.htm

"The aircraft was originally designed to be pressurized, but the rotating wing (for shipboard stowage) makes it difficult to properly seal the cabin. As a result, pilots and aircrew must wear oxygen masks while flying above 10,000 feet (3,000 m). The Osprey uses an on-board oxygen generating system (OBOGS) which enriches ambient air by filtering out the oxygen."

AFAIK this is correct for the Pilots, how ever for everyone riding in the back of the aircraft they use oxygen bottles.



C-130; it's a love-hate relationship
User currently onlineMax Q From United States of America, joined May 2001, 4463 posts, RR: 19
Reply 5, posted (5 years 9 months 2 weeks 4 days 11 hours ago) and read 9595 times:

Thanks for the information.


The best contribution to safety is a competent Pilot.
User currently offlineCTR From United States of America, joined Jul 2005, 303 posts, RR: 0
Reply 6, posted (5 years 9 months 2 weeks 4 days 10 hours ago) and read 9570 times:



Quoting UnattendedBag (Reply 3):
The aircraft was originally designed to be pressurized, but the rotating wing (for shipboard stowage) makes it difficult to properly seal the cabin.

This site's information is proof that you should never believe everything you see on the web!

The V-22 rotating wing has nothing to do with the fuselage not being pressurized.

It does not take an aerospace engineer to realize that pressurized fuselages have circular cross sections. Ever see a square balloon?

The V-22 has a square cross section like most unpressurized cargo aircraft (ie Cessna Caravan) to maximize internal volume for structural weight. The V-22 has a square unpressurized fuselage because for the missions it was designed for it made the most sense.

Not to mention one bullet in the fuselage is all it takes to prevent pressurisation.

Have fun,

CTR



Aircraft design is just one big compromise,,,
User currently onlineMax Q From United States of America, joined May 2001, 4463 posts, RR: 19
Reply 7, posted (5 years 9 months 2 weeks 4 days 5 hours ago) and read 9479 times:

You raise some very good points CTR.

I stand to be corrected, but isn't the C130 fuselage pretty 'square' and I'm almost positive the Hercules is pressurized.

I realise, for minimal stress loading the fuselage is best in a circular form (a la 777) but it doesn't have to be.

Even if the pressure hull is penetrated by a bullet, unless there is an accompanying explosion resulting in a big hole, a bullet hole alone would not necessarily result in a pressure loss.

A bullet hole doesn't have to be that big, I've seen bigger leaks around doors and the pressurisation system could handle it.



The best contribution to safety is a competent Pilot.
User currently offlineCTR From United States of America, joined Jul 2005, 303 posts, RR: 0
Reply 8, posted (5 years 9 months 2 weeks 3 days 22 hours ago) and read 9430 times:

Actually the C-130 Herc fuselage is very close to round. While the V-22 fuselage is definitly almost square.

True, if you have a big enough supply of air you can maintain pressure with any size hole. But you would be surprized how much air pressure can be lost through even a small hole. Plus, unlike conventional aircraft, the V-22 cannot use large quantities of engine bleed air to pressureize the fuselage. This is due to the complexity in piping air from the rotating nacelles and the loss of engine power caused by bleed air.

Have fun,

CTR



Aircraft design is just one big compromise,,,
User currently offlineWalter2222 From Belgium, joined Sep 2005, 1293 posts, RR: 28
Reply 9, posted (5 years 9 months 2 weeks 3 days 16 hours ago) and read 9317 times:



Quoting Max Q (Reply 7):
but isn't the C130 fuselage pretty 'square' and I'm almost positive the Hercules is pressurized

It is looking pretty "round", as can be seen here:


View Large View Medium
Click here for bigger photo!

Photo © Walter Van Bel



the cargo area looks pretty "square", but you can still distiguish the round shape:


View Large View Medium
Click here for bigger photo!

Photo © Walter Van Bel



Best regards,

Walter



canon 340d ;-) - EFS10-22mm f/3.5-4.5 USM - EFS18-55mm - EF28-105mm f3.5/4.5 - EF100-400mm f4.5-5.6l is usm - ...
User currently offlineCTR From United States of America, joined Jul 2005, 303 posts, RR: 0
Reply 10, posted (5 years 9 months 2 weeks 3 days 9 hours ago) and read 9180 times:

[quote=Walter2222,reply=9]the cargo area looks pretty "square", but you can still distiguish the round shape:

If you look carefully at the photo Walter posted you can see that the internal walls are circular both forward and aft of the boxed in square section. These boxed in areas house the main landing gear struts and support structure.

Have fun,

CTR



Aircraft design is just one big compromise,,,
User currently onlineMax Q From United States of America, joined May 2001, 4463 posts, RR: 19
Reply 11, posted (5 years 9 months 2 weeks 3 days 5 hours ago) and read 9108 times:

Yes, good point there on the cross section, I still maintain, however that just one small bullet hole will not necessarily cause you to depressurise, especially on a C130 with a relatively low cabin differential.

I have seen daylight around large sections of cabin doors on civilian jet transports and all we had was some whistling.

Our high tech cure was to stuff wet paper towels in the gaps..



The best contribution to safety is a competent Pilot.
User currently offlineRwessel From United States of America, joined Jan 2007, 2346 posts, RR: 2
Reply 12, posted (5 years 9 months 2 weeks 3 days 2 hours ago) and read 9063 times:
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Quoting UnattendedBag (Reply 3):
The Osprey uses an on-board oxygen generating system (OBOGS) which enriches ambient air by filtering out the oxygen."

They enrich the ambient air by filtering *out* the oxygen?!  faint 

Remind be to take my own oxygen bottle if I ever get a ride on an Osprey...  Wink


User currently offlineAlessandro From , joined Dec 1969, posts, RR:
Reply 13, posted (5 years 7 months 1 week 3 days 12 hours ago) and read 7836 times:

So is the V-22 deployed in Afghanistan, if so how does it do in the higher altitude ops than in
Al-Anbar in Iraq?


User currently offlineCTR From United States of America, joined Jul 2005, 303 posts, RR: 0
Reply 14, posted (5 years 7 months 1 week 2 days 19 hours ago) and read 7661 times:



Quoting Alessandro (Reply 13):
So is the V-22 deployed in Afghanistan, if so how does it do in the higher altitude ops than in
Al-Anbar in Iraq?

Osprey not in Afghanistan yet, but sounds like soon....

http://en.epochtimes.com/n2/content/view/10808/

Have fun,

CTR



Aircraft design is just one big compromise,,,
User currently offlineUnattendedBag From United States of America, joined Oct 2003, 2326 posts, RR: 1
Reply 15, posted (5 years 7 months 1 week 2 days 16 hours ago) and read 7626 times:



Quoting CTR (Reply 6):
This site's information is proof that you should never believe everything you see on the web!

next time I see one, i will ask one of the drivers.  Smile



Slower traffic, keep right
User currently offlineDragon6172 From United States of America, joined Jul 2007, 1202 posts, RR: 0
Reply 16, posted (5 years 7 months 1 week 2 days 13 hours ago) and read 7581 times:

As I recall the fuselage does maintain a positive pressure differential to keep outside air out, for NBC purposes. I think this gets misquoted and misunderstood quite a bit.


Phrogs Phorever
User currently offlineCTR From United States of America, joined Jul 2005, 303 posts, RR: 0
Reply 17, posted (5 years 7 months 1 week 2 days 8 hours ago) and read 7542 times:



Quoting Dragon6172 (Reply 16):
As I recall the fuselage does maintain a positive pressure differential to keep outside air out, for NBC purposes. I think this gets misquoted and misunderstood quite a bit.

NBC protection equipment can be installed as a kit if the mission reqiires. For all other missions the kit stays on the shelf to minimize aircraft weight.

Have fun,

CTR



Aircraft design is just one big compromise,,,
User currently offlineUnattendedBag From United States of America, joined Oct 2003, 2326 posts, RR: 1
Reply 18, posted (5 years 5 months 2 weeks 5 days 12 hours ago) and read 6495 times:



Quoting UnattendedBag (Reply 15):
next time I see one, i will ask one of the drivers.

just spoke with one of the crew on board 166733 EM-02. He stated the aircraft (cockpit & fuselage) are not pressurized. At altitude, the crew must use oxygen.



Slower traffic, keep right
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