Wing breaking in hard turns, seriously? - ED Forums
 


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Old 09-14-2018, 03:11 PM   #1
DanielNL
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Exclamation Wing breaking in hard turns, seriously?

Do we know if it's realistic, that if AV-8B pilot inputs too sudden pitch up at somewhere around Mach 0.7 with 4 AGM and 2 AIM9 equipped, a wing will break off?
I doubt that McDonnell Douglas wouldn't make the airframe strong enough for maneuvers AND/OR not limit pilot input by flight computer to cause too much stress on the wings...
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Old 09-14-2018, 05:24 PM   #2
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Could you give us a track ? I've not been able to reproduce, pulling as hard as I can flying at mach 0.7 with 2*AIM9s, 4*AGM-65Gs, a gunpod and full fuel.

Also, in the pocket guide that you didn't read, there is a handy chart telling you that, if you pull more the 6G in a Harrier that weights 28000lbs and is flying with a symmetrical loadout, you are outside the acceleration limitations. At mach 0.7 depending on the maneuver you should be fine, I tested it and was hitting 5Gs, but any faster and yes your wings should snap.

Page 35 of the pocket guide, knock yourself out, read it .
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Old 09-14-2018, 05:34 PM   #3
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Quote:
Originally Posted by Rex854Warrior View Post
At mach 0.7 depending on the maneuver you should be fine, I tested it and was hitting almost 5Gs, but any faster and yes your wings should snap.

.
and yes the airframe may get damaged , and see its service life time severely reduced

in some case, the plane would not be allowed to fly again



has there been any account of wings snapping off due to - controlled - Over-G ?
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Old 09-14-2018, 05:45 PM   #4
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Quote:
Originally Posted by Vilab View Post
has there been any account of wings snapping off due to - controlled - Over-G ?
Have been messing with it for about 20 minutes and I couldn't get the wings to snap even after overloading (0 to +6-7Gs) the wings several times in a row even with a GWT over 30000lbs. If you go over the negative G limitation though the wings snap almost immediatly.
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Old 09-14-2018, 05:58 PM   #5
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The AV-8B N/A was never designed to be a hard turn fighter, let alone while fully loaded. As explained the info on its limits can be found in the manual.


Every aircraft ever made has specific limits, that will lead to complete catastrophic failure of its air-frame components and finally the AV8B is NOT a FBW (fly by wire) design so it cannot limit pilot control.
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Old 09-14-2018, 07:44 PM   #6
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Not fly by wire? So there are real cables from cockpit to control surfaces? O___O
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Old 09-14-2018, 08:18 PM   #7
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Quote:
Originally Posted by DanielNL View Post
Not fly by wire? So there are real cables from cockpit to control surfaces? O___O

No. Hydraulics.
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Old 09-14-2018, 08:26 PM   #8
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Isn't that FBW, an electronic signal through a cable controls the hydraulic valves at the control surfaces? Or does FBW only reference that a computer receives pilot input and then the computer itself controls the surfaces?
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Old 09-14-2018, 08:45 PM   #9
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Quote:
Originally Posted by DanielNL View Post
Isn't that FBW, an electronic signal through a cable controls the hydraulic valves at the control surfaces? Or does FBW only reference that a computer receives pilot input and then the computer itself controls the surfaces?
Correct. In a FBW craft when you pull the stick you aren't even telling the computer to move the elevators x degrees, you're telling it to give me x percent of the currently allowable pitch rate and then the computer moves the elevators to a deflection to produce that rate.
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Old 09-14-2018, 08:49 PM   #10
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So there's even already an new level, after FBW that even more modern combat aircraft use? (where the computer calculates, like Eurofighter I think)
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