Armadillo Aerospace

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Graham C. Williams
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Armadillo Aerospace

Post by Graham C. Williams » Wed Jun 16, 2004 10:01 am


Bruno Ogorelec
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Post by Bruno Ogorelec » Mon Jun 28, 2004 4:56 pm

Graham, this is amazing! What fantastic control they have on takeoff and landing! What a pity to see the guys lose out on the X-Prize (which I assume will be taken by Spaceship One). I wish there were more than one. While the SS1 project looks more practical, this has me really impressed.

I wonder how far the SS1 team is on the pulse detonation engine.

Graham C. Williams
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re: Armadillo Aerospace

Post by Graham C. Williams » Thu Sep 15, 2005 9:53 am

In June 2004 they did this with a H2O2 motor.
http://media.armadilloaerospace.com/200 ... tedHop.mpg

For 2005 they are doing it again but with a Lox motor. I've nothing but admeration for the achievements of this small team.
The following was posted to the aRocket@exrocketry.net pages.

Enjoy.
Graham.

John Carmack wrote:
> All four tests from Saturday (13 megs):
>
> test with engine lox fitting leaking
> 26 second burn-to-depletion with five gallons of ethanol (half full)
> short test of adjusted gain to reduce oscillations
> ground liftoff
>
> http://media.armadilloaerospace.com/200 ... Hovers.mpg
>
> just the final ground liftoff (3 megs):
>
> http://media.armadilloaerospace.com/200 ... iftoff.mpg
>
> > We are doing more tests tomorrow with modified control values that
> should result in a very smooth hold, but these tests do give a very good
> sense of the "balancing pencil" behavior.
>
> An unexpected wrinkle in the control system behavior: Attitude hold is
> just as you would expect -- to point the vehicle more to the left, point
> the engine that way to cause the vehicle to rotate. If you add position
> hold, it has a bit of a counter effect, because to move the whole
> vehicle to the left, you need to rotate it to point more to the left,
> but to do that, the gimbal has to point the engine left, which actually
> gives the vehicle a slight acceleration to the right as it is rotating.
> No big deal, it just requires some adjusting of the gains, but I didn't
> think about this at first.
>
> John Carmack

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