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Old 10-24-2019, 03:49 PM   #1
tporter416
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747 Structural Failure...


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Posted today from Brazil, unfortunate structural failure....

https://youtu.be/eT4kxp7sYs4
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Old 10-24-2019, 04:29 PM   #2
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Re: 747 Structural Failure...

Yup a wing let go . Wonder if they ever did a load test on that wing prior to flying ? Not likely.
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Old 10-24-2019, 05:37 PM   #3
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Re: 747 Structural Failure...

Wow. Pretty unfortunate. That looked like quite a close low pass by the flight line. I bet those sheep had a huge 'pucker' factor!
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Old 10-24-2019, 07:34 PM   #4
tporter416
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Re: 747 Structural Failure...

Quote:
Originally Posted by stegl View Post
Yup a wing let go . Wonder if they ever did a load test on that wing prior to flying ? Not likely.
I bet he forgot to insert the spar...
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Old 10-24-2019, 08:10 PM   #5
j-c terrettaz
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Re: 747 Structural Failure...

Great ...no cows or animals was arm ...scare... oh yes
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Old 10-24-2019, 08:40 PM   #6
stegl
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Re: 747 Structural Failure...

Don’t think he forgot the spar because an aircraft that big and heavy would have lost a wing on takeoff . Unless the wing tube or whatever he used as a spar ,was not strong enough . Back to testing With weights again !
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Old 10-24-2019, 11:04 PM   #7
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Re: 747 Structural Failure...

It looked to me like there was some low frequency flutter or oscillation in the tail surfaces - could have easily caused some reversing bending loads on the wing. There was a full scale Airbus that crashed when the vertical stab broke off after the pilot was getting into PIO’s with the rudder to correct for wake turbulence - similar failure.

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Old 10-25-2019, 12:21 AM   #8
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Re: 747 Structural Failure...

The wing and structure weren’t strong enough for the weight and maneuvers. Impressive size, but not designed to do high G maneuvers, even in its RC version.

When there is no spar, it usually folds the wings right after rotation.

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Old 10-25-2019, 01:41 AM   #9
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Re: 747 Structural Failure...

I can't decide if it was just really unstable or if the pilot is a really terrible pilot. I feel like the airplane was doomed even if it hadn't come apart.
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Old 10-25-2019, 01:50 AM   #10
stegl
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Re: 747 Structural Failure...

Yup , runway pretty short with the trees at the approach end for an aircraft of that size.

Last edited by stegl; 10-25-2019 at 01:57 AM.
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