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'[OT:] Bad day at Armadillo...'
2004\08\10@044541 by Russell McMahon

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Spectacular crash of John Carmack's big rocket.
$US35,000 lesson - hopefully it will represent value for money in the longer
term.

> --- John Carmack wrote:
> We totaled the big vehicle.
>
>
> http://www.armadilloaerospace.com/n.x/Armadillo/Home/News?news_id=272
>
> New and improved version in the works...

Text.
Quite a few jpgs
Most interesting is the ~4.6MB movie file.
Main tank flew about 200 yards.

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2004\08\10@061747 by Howard Winter

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Russell,

On Tue, 10 Aug 2004 20:37:01 +1200, Russell McMahon
wrote:

> Spectacular crash of John Carmack's big rocket.
$US35,000 lesson - hopefully it will represent value
for money in the longer term.

Sometimes "Whoops!" just doesn't cover it!

Interesting video - I'm a bit amazed that something that
unwieldy-looking flies as straight as it does...  Did!
The CofG must be way above the centre of thrust, which
ought to make it naturally unstable (as with most
rockets in fact).

Cheers,


Howard Winter
St.Albans, England

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2004\08\10@063829 by Russell McMahon

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> Interesting video - I'm a bit amazed that something that
> unwieldy-looking flies as straight as it does...  Did!
> The CofG must be way above the centre of thrust, which
> ought to make it naturally unstable (as with most
> rockets in fact).

The rocket is dynamically stabilised.
With John Carmack as the team leader software writer that shouldn't be a
surprise.

You can see the rocket wobble slightly soon after it leaves the ground.
In some of the jpgs you can see the remains of the control mechanisms. There
are (were) four largish servo motors driving triangular thrust deflection
vanes which impinge into the rocket exhaust. These are clearly visible in
the photos. The triangles are normally vertical - when turned at 90 degrees
they form most of a closed square which would block most of the exhaust if
ever turned that far. Very effective. Uses a rather expensive inertial
navigation unit to provide information.

The problem was a "simple matter" of running out of propellant. The reasons
are explained in the text. Obvious enough after the event. Not obvious
enough in advance.




       RM

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2004\08\10@071849 by D. Jay Newman

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> Spectacular crash of John Carmack's big rocket.
> $US35,000 lesson - hopefully it will represent value for money in the longer
> term.

$35,000 is fairly cheap for a prototype failure. And they'll be going again
in about five weeks.

One of the best engineering statements I've heard is that if you don't
break one or two of your prototypes, why'd you build them in the first
place?
--
D. Jay Newman           ! DCX - it takes off and lands base down,
spam_OUTjayTakeThisOuTspamsprucegrove.com     !       as God and Robert Heinlein intended.
http://enerd.ws/robots/ !

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2004\08\10@072718 by Jake Anderson

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i believe the IMU module they use is around $14000
(though a number of $8000 is also springing to mind)
that is just for the IMU itself, not the computer or any of
the other onboard electronics.
the tank i think was their other large single expendature
(that may be where the $8000 is coming to mind from)


> {Original Message removed}

2004\08\10@072720 by Spehro Pefhany

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At 07:12 AM 8/10/2004 -0400, you wrote:
> > Spectacular crash of John Carmack's big rocket.
> > $US35,000 lesson - hopefully it will represent value for money in the
> longer
> > term.
>
>$35,000 is fairly cheap for a prototype failure. And they'll be going again
>in about five weeks.
>
>One of the best engineering statements I've heard is that if you don't
>break one or two of your prototypes, why'd you build them in the first
>place?

Many, many early rockets blew up on the pad, and that was using the very
best 1950's/60's technology available to the military of the US and USSR.

This one at least got further...

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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