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Stress On A/C From Simulated Weightless Flight  
User currently offlineFlyASAGuy2005 From United States of America, joined Sep 2007, 7004 posts, RR: 11
Posted (5 years 6 months 1 week 4 days 9 hours ago) and read 2252 times:

Everyone has seen NASA and other commercial entities emulate weightless flight. NASA calls is Weightless Wonder IIRC, and their air other companies that do it commercially for a price. I thought about this because I saw a bite on my locals news channel two days ago about Georgia science teachers that got a chance to experience this.

Basically, from my understanding, you climb to a pre-determined safe altitude, anywhere between 30 and 35,000ft. The they pretty much go into a series of dives with the participants not strapped in and they being to float around the cabin (correct me if I'm wrong or elaborate on the procedures).

What stresses are put on the aircraft in any? Are they any specific mods or certifications that must be done? The one I saw was done on a 727.


What gets measured gets done.
3 replies: All unread, jump to last
 
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 1, posted (5 years 6 months 1 week 4 days 8 hours ago) and read 2238 times:

Certainly there are stresses put on the aircraft during the recovery phase, in which the pilots pull out of the parabolic arc at 2 G. This is well within tolerances even for normal operations. I assume, though, that due to the prolonged and repeated exposure to 2 G extra fatigue checks are in place.

Quoting FlyASAGuy2005 (Thread starter):
Basically, from my understanding, you climb to a pre-determined safe altitude, anywhere between 30 and 35,000ft. The they pretty much go into a series of dives with the participants not strapped in and they being to float around the cabin (correct me if I'm wrong or elaborate on the procedures).

You're almost right. Using a simple dive would make for a short flight. The aircraft climbs sharply, then the pilots push the nose down in a parabolic arc, simulating weightlessness. At the end of the arc, they pull up sharply (at 2 G) and climb again for another arc. The cycle is performed numerous times during one flight.



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineFlyASAGuy2005 From United States of America, joined Sep 2007, 7004 posts, RR: 11
Reply 2, posted (5 years 6 months 1 week 4 days 8 hours ago) and read 2227 times:



Quoting Starlionblue (Reply 1):
You're almost right. Using a simple dive would make for a short flight. The aircraft climbs sharply, then the pilots push the nose down in a parabolic arc, simulating weightlessness. At the end of the arc, they pull up sharply (at 2 G) and climb again for another arc. The cycle is performed numerous times during one flight.

I.C., so basibally they do a series of up and down arc.

http://www.nasa.gov/images/content/52357main_kc135_tra.jpeg



What gets measured gets done.
User currently offlineStarlionblue From Greenland, joined Feb 2004, 16908 posts, RR: 67
Reply 3, posted (5 years 6 months 1 week 3 days 21 hours ago) and read 2146 times:



Quoting FlyASAGuy2005 (Reply 2):
I.C., so basibally they do a series of up and down arc.

Indeed. 20-30 times per flight IIRC.



"There are no stupid questions, but there are a lot of inquisitive idiots."
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