Hard Landings, Shear Buckling, etc.
Hard Landings, Shear Buckling, etc.
(OP)
Used to be, you couldn't get this close to this plane without enlisting, or risking a bullet:

Those with a good eye for structures will notice some wrinkles. Looking a bit closer...


That's actually a LOT of wrinkles. They continue all the way up the nose to the gunner's deck.
Hard landing? Pulling G's in flight?

Those with a good eye for structures will notice some wrinkles. Looking a bit closer...


That's actually a LOT of wrinkles. They continue all the way up the nose to the gunner's deck.
Hard landing? Pulling G's in flight?
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF
RE: Hard Landings, Shear Buckling, etc.
RE: Hard Landings, Shear Buckling, etc.
another day in paradise, or is paradise one day closer ?
RE: Hard Landings, Shear Buckling, etc.
You are generally correct... these are standard BUFF 'beauty-wrinkles' due to gravity on all unpressurized B-52s... and often KC-135s.
Boeing's early jet fuselages tended to have closely spaced longitudinal stiffeners and widely spaced body frames, with very thin skins [often spot-welded to thin internal doublers to minimize riveting issues]... which saved weight but promoted elastic skin-wrinkles on the ground. Some internal webs are 'so thin' that 'high-time' cracking due to flexural buckling/tensioning is a genuine maintenance nuisance [and was generally predicted by pressurization fatigue tests].
NOTE.
'Jig-jacking' the airframe [jacking into a manufacturing jig-position]... or in-flight pressurization... generally relieves [smooths-out] a high percentage of these body wrinkles.
NOTE.
On-the-other-hand, early high-wing Lockheed transports [C-130, C-141, C-5] tended toward thicker/stiffer webs and body skins... so these rarely show wrinkles due to static gravity loads... and typically have fewer internal web cracks over their service life.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: Hard Landings, Shear Buckling, etc.
another day in paradise, or is paradise one day closer ?
RE: Hard Landings, Shear Buckling, etc.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: Hard Landings, Shear Buckling, etc.
I still remember the way the hair stood up on the back of my neck when I was on the flight deck of a B-52H working on the avionics the day I saw my very first nuclear weapon travel down to the alert area to "cock" an aircraft for war. Thank God the war stayed "cold" because I never wanted to see those alert birds go for the real thing.
Nowadays I have at least as many wrinkles as the BUFF in the photo, and neither jig-jacking nor pressurizing me would make then go away!
RE: Hard Landings, Shear Buckling, etc.
Finally one day I asked obvious question: 'what happened to cause his hearing loss?'
He kinda hesitated before he replied... I could see some pain flicker in his eyes.
He was a navigator on a B-52 mission over North Vietnam. At ~50,000-Ft, just after dropping their bomb load, a SAM detonated ~100-ft** under the jet just below the flight deck and forward bomb-bay. The sudden depressurization... blew-out almost everyone's eardrums and 'caused other injuries/pain'. Some mechanical systems went-down, but the BUFF held together and was flyable, so the crew kept it airborne to get away from territory they just bombed. They eventually landed the crippled jet at a divert base.
The entire flight crew lost their hearing [individually to greater/lesser extents] and he suffered sudden decompression injuries for weeks afterwards.
BUT... They were alive and they didn't have to eject over NVN!
He/most-of-the-other-guys never flew [missions] again... and their jet was scrapped on-site.
** SAM 'hit' was witnesses from a near-by BUFF. That crew could barely believe their jet didn't fold-up like a cheap suit... like others had.
Regards, Wil Taylor
o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]
RE: Hard Landings, Shear Buckling, etc.
RE: Hard Landings, Shear Buckling, etc.
So I thought it was a -52H. What am I missing? (I'm a youngster, you see...)
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF
RE: Hard Landings, Shear Buckling, etc.
https://www.museumofflight.org/aircraft/boeing-b-5...
http://www.rbogash.com/B-52/B-52_Top_Page.html
RE: Hard Landings, Shear Buckling, etc.
Second, once it was down to a G or an H, then I looked at the engines. The OP photo aircraft has the older J-57 turbojet engines (see again first OP photo), but the H had the newer TF-33 turbofans with the oversize inlet cowls (see my photo of an H below). The TF-33 engine on the H is why the H models at takeoff power never created exhaust clouds of such starkly monstrous size and dark coloration as the J-57 engines did with water injection.
RE: Hard Landings, Shear Buckling, etc.