Author Topic: could real life aircraft take it?  (Read 1696 times)

Offline Serenity

  • Platinum Member
  • ******
  • Posts: 7313
Re: could real life aircraft take it?
« Reply #15 on: May 24, 2008, 06:28:46 PM »
You don't see how having a 500lb bomb under six or seven g's of force could overstress and bend the metal of a wing?  The force of the bomb is acting like a fulcrum, bending the wing where it attaches to the fuselage.

I think what he was saying is the wing would bend at the fuselage, NOT at the rack itself as the post would lead you to believe.

Offline colmbo

  • Gold Member
  • *****
  • Posts: 2246
      • Photos
Re: could real life aircraft take it?
« Reply #16 on: May 24, 2008, 06:44:07 PM »
You don't see how having a 500lb bomb under six or seven g's of force could overstress and bend the metal of a wing?  The force of the bomb is acting like a fulcrum, bending the wing where it attaches to the fuselage.

No I don't but I'm finding it hard to explain it to you in writing. (I'm a pilot, I use my hands to talk <G>)  Google "zero fuel weight".  That should explain what I'm getting at.
Columbo

"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

Fate whispers to the warrior "You cannot withstand the storm" and the warrior whispers back "I AM THE STORM"

Offline spit16nooby

  • Copper Member
  • **
  • Posts: 256
Re: could real life aircraft take it?
« Reply #17 on: May 24, 2008, 08:05:11 PM »
Well the airplane would live the pilot would be so confused that he landed in Berlin instead of London on a trip to paris.

Offline colmbo

  • Gold Member
  • *****
  • Posts: 2246
      • Photos
Re: could real life aircraft take it?
« Reply #18 on: May 25, 2008, 12:47:17 AM »
Remember that the wing bends upward.  It isn't bent downward by the weight of the bomb.
Columbo

"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

Fate whispers to the warrior "You cannot withstand the storm" and the warrior whispers back "I AM THE STORM"

Offline Stoney

  • Gold Member
  • *****
  • Posts: 3482
Re: could real life aircraft take it?
« Reply #19 on: May 25, 2008, 02:31:46 AM »
You don't see how having a 500lb bomb under six or seven g's of force could overstress and bend the metal of a wing?  The force of the bomb is acting like a fulcrum, bending the wing where it attaches to the fuselage.

The pylon the bomb was attached to would let go before the wing failed.
"Can we be incorrect at times, absolutely, but I do believe 15 years of experience does deserve a little more credence and respect than you have given from your very first post."

HiTech

Offline OOZ662

  • Platinum Member
  • ******
  • Posts: 7019
Re: could real life aircraft take it?
« Reply #20 on: May 25, 2008, 08:54:14 AM »
I think the problem was that the pylon wouldn't let go. IIRC, he landed with it and it finally plopped off on the runway and cause damage to the aircraft as it did so.

Now remember that people aren't actually pulling the kind of maneuvers you're seeing, especially any kind of snap or instant maneuver. What is a quick, within-physics turn gets bent by the lagtime of the internet and the code made to dampen that lagtime into an instant 80 or 90 degree turn. This is where the term "stick stirring" came into effect. With the new dampening code and the old "don't move your controls so rapidly" effect, it's been reduced. Before those measures, you were able to slap your stick around in all directions (like stirring a pot) and you'd see tiny movements on your screen. As the opponent's front end tried to foresee where your plane was headed, your aircraft would rotate and spin in mid-air.
A Rook who first flew 09/26/03 at the age of 13, has been a GL in 10+ Scenarios, and was two-time Points and First Annual 68KO Cup winner of the AH Extreme Air Racing League.

Offline Stoney

  • Gold Member
  • *****
  • Posts: 3482
Re: could real life aircraft take it?
« Reply #21 on: May 25, 2008, 12:41:30 PM »
I think the problem was that the pylon wouldn't let go.

No, like Colombo mentioned, the wing is designed (under +G) to sustain loads that would cause the wing to bend upwards.  Having the bomb pylon out at mid-wing actually helps with +G loading.  The issue is one regarding the strength of the pylon attach points (the actual hardware that attaches the bomb to the pylon, and the pylon to the wing).  The pylon would fail before the wing would fail, unless the pylon was designed to sustain higher limit loads than the wing (which wouldn't make sense from an engineering standpoint).  Airspeed limits are designed to ensure the wing doesn't rip itself off as a result of lifting loads that exceed the wings ability to resist the upward bending moment caused by lift.  G-limits are the same, as the increased weight of the fuselage would make the wings bend upwards.  -G loads are the only loads that would cause the wing to bend down.

If anyone has seen the video of that CDF C-130 crashing while pulling out of a retardent drop run, you'll notice the wings rip off in an upward motion.

That being said, I personally think the airspeed limitations as they pertain to ordnance aren't reflected well in-game.  All of the speeds listed below can be exceeded in-game without damaging a P-47N.

"Can we be incorrect at times, absolutely, but I do believe 15 years of experience does deserve a little more credence and respect than you have given from your very first post."

HiTech

Offline Karnak

  • Radioactive Member
  • *******
  • Posts: 23048
Re: could real life aircraft take it?
« Reply #22 on: May 25, 2008, 07:13:05 PM »
The pylon the bomb was attached to would let go before the wing failed.
Not always true.  One of the few cases I know of where Spit wings folded was doing a high G pullout of a slope bombing run when the 500lb bomb failed to release.  It was a Mk IX and the wings folded.
Petals floating by,
      Drift through my woman's hand,
             As she remembers me-

Offline Shuckins

  • Gold Member
  • *****
  • Posts: 3412
Re: could real life aircraft take it?
« Reply #23 on: May 25, 2008, 08:24:06 PM »
If memory serves, the problem with the Mustang's wings stemmed from airflow at high speeds causing the wheel well cover to partially deploy.  The resulting forces wrenched the wings off. 

I remember reading a short article about this several years ago.  An American pilot stationed in Italy had seen a number of fatal crashes in which a Mustang had lost its wings while pulling out of a dive.  An engineer from North American was sent to his base to investigate.  When the pilot explained that the crashes occurred when the P-51 shed its wings, the engineer snorted derisively and stated that, "It was impossible to pull the wings off a Mustang."

No sooner had the words left his mouth, than they heard the twin "thumps" of a Mustang shedding its wings.  The engineer asked, "What was that?" The pilot responded,  "It just happened again."  The wingless wreckage smashed into the ground within the perimeter of the airbase.  The pilot was killed.

Offline AquaShrimp

  • Persona Non Grata
  • Silver Member
  • ****
  • Posts: 1706
Re: could real life aircraft take it?
« Reply #24 on: May 25, 2008, 10:08:05 PM »
I've read that story too Shuckins. 

Offline colmbo

  • Gold Member
  • *****
  • Posts: 2246
      • Photos
Re: could real life aircraft take it?
« Reply #25 on: May 26, 2008, 12:00:01 AM »
Not always true.  One of the few cases I know of where Spit wings folded was doing a high G pullout of a slope bombing run when the 500lb bomb failed to release.  It was a Mk IX and the wings folded.

Doesn't the Spit carry it's bomb under the fuselage?  If so, all weight is concentrated at the wing root.  Over G is over G
Columbo

"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

Fate whispers to the warrior "You cannot withstand the storm" and the warrior whispers back "I AM THE STORM"

Offline colmbo

  • Gold Member
  • *****
  • Posts: 2246
      • Photos
Re: could real life aircraft take it?
« Reply #26 on: May 26, 2008, 12:01:44 AM »
If memory serves, the problem with the Mustang's wings stemmed from airflow at high speeds causing the wheel well cover to partially deploy.  The resulting forces wrenched the wings off. 

I remember reading a short article about this several years ago.  An American pilot stationed in Italy had seen a number of fatal crashes in which a Mustang had lost its wings while pulling out of a dive.  An engineer from North American was sent to his base to investigate.  When the pilot explained that the crashes occurred when the P-51 shed its wings, the engineer snorted derisively and stated that, "It was impossible to pull the wings off a Mustang."

No sooner had the words left his mouth, than they heard the twin "thumps" of a Mustang shedding its wings.  The engineer asked, "What was that?" The pilot responded,  "It just happened again."  The wingless wreckage smashed into the ground within the perimeter of the airbase.  The pilot was killed.

I met an old Mustang pilot that was involved in some of the testing done in England to troubleshoot the wing shedding problem.  In one of his dives the gear sagged but the wings stayed on -- although badly damaged and deformed.  They were able to determine cause and a fix was worked up.
Columbo

"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return."

Fate whispers to the warrior "You cannot withstand the storm" and the warrior whispers back "I AM THE STORM"

Offline Lumpy

  • Persona Non Grata
  • Nickel Member
  • ***
  • Posts: 547
Re: could real life aircraft take it?
« Reply #27 on: May 26, 2008, 02:05:10 PM »
Stick stirring in a Yak 55M:

“I’m an angel. I kill first borns while their mommas watch. I turn cities into salt. I even – when I feel like it – rip the souls from little girls and now until kingdom come the only thing you can count on, in your existence, is never ever understanding why.”

-Archangel Gabriel, The P

Offline Wingnutt

  • Silver Member
  • ****
  • Posts: 1665
Re: could real life aircraft take it?
« Reply #28 on: June 02, 2008, 11:09:25 PM »
Stick stirring in a Yak 55M:



you cant be serious.

Offline Cthulhu

  • Gold Member
  • *****
  • Posts: 2463
Re: could real life aircraft take it?
« Reply #29 on: June 03, 2008, 09:51:14 AM »
No, like Colombo mentioned, the wing is designed (under +G) to sustain loads that would cause the wing to bend upwards.  Having the bomb pylon out at mid-wing actually helps with +G loading.  The issue is one regarding the strength of the pylon attach points (the actual hardware that attaches the bomb to the pylon, and the pylon to the wing).  The pylon would fail before the wing would fail, unless the pylon was designed to sustain higher limit loads than the wing (which wouldn't make sense from an engineering standpoint).  Airspeed limits are designed to ensure the wing doesn't rip itself off as a result of lifting loads that exceed the wings ability to resist the upward bending moment caused by lift.  G-limits are the same, as the increased weight of the fuselage would make the wings bend upwards.  -G loads are the only loads that would cause the wing to bend down.

If anyone has seen the video of that CDF C-130 crashing while pulling out of a retardent drop run, you'll notice the wings rip off in an upward motion.

That being said, I personally think the airspeed limitations as they pertain to ordnance aren't reflected well in-game.  All of the speeds listed below can be exceeded in-game without damaging a P-47N.

(Image removed from quote.)

Kudo's Stoney. :aok Somebody actually get's it. Is it safe to say you actually know what a Shear & Moment Diagram is?

You don't see how having a 500lb bomb under six or seven g's of force could overstress and bend the metal of a wing?  The force of the bomb is acting like a fulcrum, bending the wing where it attaches to the fuselage.

Wing-mounted stores actually reduce the wing root bending moments during pull-outs. Where stores on the wing become an issue is on recovery, where a hard landing can produce nasty negative bending moments at the wing root (or the wing fold mechanism on carrier planes.
"Think of Tetris as a metaphor for life:  You spend all your time trying to find a place for your long thin piece, then when you finally do, everything you've built disappears"