A380 Min Velocity Take off test

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joco
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A380 Min Velocity Take off test

Post by joco » Fri Oct 23, 2009 6:07 pm

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Re: A380 Min Velocity Take off test

Post by AMM » Fri Oct 23, 2009 11:14 pm

Was the double contact strike (one with the strike plate and the other with the tail cone) in the first video intentional? Compared to the second video and a similar video of the 777 test I saw, it begs the question.
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Re: A380 Min Velocity Take off test

Post by joco » Sat Oct 24, 2009 4:09 am

It looks to me that for a split sec the a/c was riding on its tail, just watch when the main gears lift and that the a/c rolls a bit left and right. I think that the tail strike was not planned, but the rwy end was coming and they tried to lift it off the rwy. It is my belief that that upon lift-off they lower the nose to gain airpeed. The tail went up pretty fast in relation to the visible part of the body on the right side of the screen.
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Re: A380 Min Velocity Take off test

Post by Mapleflt » Sat Oct 24, 2009 3:38 pm

Sorry boys and girls its not a tail strike. Its one of the test points for type certification call demonstrated Vmu or in plane (no pun intended) minimum unstick speed. Its all well planned, thought out and undertaken with due regard for safety. You can see the red "crush can" mounted on the tail to kake some of the expected damage.
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Re: A380 Min Velocity Take off test

Post by AMM » Sat Oct 24, 2009 4:40 pm

I'm aware its a certification test. Its pretty obvious even without reading the video title. And its still a tail strike even if its a test.

I was pointing out that in the first video there was ground contact with both the "crush can" and the further aft tail section. This doesn't happen in the second video, nor in this similar 777 test (http://www.youtube.com/watch?v=9VqG2WRe ... re=related).

Just wondering if the double contact was accidental or not.
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Re: A380 Min Velocity Take off test

Post by Mapleflt » Sat Oct 24, 2009 5:16 pm

No insult intended, chill man.
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Re: A380 Min Velocity Take off test

Post by Pygmie » Sat Oct 24, 2009 8:19 pm

AMM wrote:I'm aware its a certification test. Its pretty obvious even without reading the video title. And its still a tail strike even if its a test.

I was pointing out that in the first video there was ground contact with both the "crush can" and the further aft tail section. This doesn't happen in the second video, nor in this similar 777 test (http://www.youtube.com/watch?v=9VqG2WRe ... re=related).

Just wondering if the double contact was accidental or not.

The double contact was NOT planned. Check out this clip from a documentary about the plane:

http://www.youtube.com/watch?v=pwQMXz9PbrY
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Re: A380 Min Velocity Take off test

Post by AMM » Sun Oct 25, 2009 2:41 am

MapleFlag wrote:No insult intended, chill man.
None taken. I guess I came across a bit defensive.

Thanks Pygmie :smt023

Makes one wonder why they didn't have two safe contact points on that massive tail.
Also if the 380 went through steel plates that easlity, whats with the 777 using oak .:?
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Re: A380 Min Velocity Take off test

Post by Mapleflt » Sun Oct 25, 2009 4:55 am

I expect that because there was a second contact point further aft then expected the total contact time and loading on the "crush can" was longer and greater until Vmu was reached. If the Boeing installation was closer to the contact point then the duration and load until Vmu was reach so a lesser strike material could be used, maybe!!!! just a hypothis.
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