Re: Armadillo 4/18

When I was writing the last email I was thinking of your debunking of 
the pendulum stabilization (with the motor on top). 
    I had thought that  bandwidth was the universal term used to 
describe a control system, but couldn't quite figure out how to put the 
parts together to get a number. Would the control system term 
"bandwidth" be the same as an information system's "bandwidth"?
    Do the various methods of rocket control have different amounts of 
minimum bandwidth to achieve the same fineness of control? For instance 
would a rocket with attitude control jets need the same bandwidth as the 
Armadillo design? It is easier to get a machine to roll than walk, do 
some systems just need more bandwidth to do the same task?

Henry Spencer wrote:

>On Mon, 19 Apr 2004, Alex Fraser wrote:
>  
>
>>    My calculation involve holding a pen up in the air and imagining 
>>what it will do. It is not easy to do if you balance it on your finger tip.
>>    
>>
>
>Note, that is an unstable system, which is considerably worse than an
>neutrally stable system like a rocket VTOL.  The analogy is false; the
>rocket has no built-in tendency to amplify a perturbation, departing
>faster and faster from the desired attitude once nudged off center. 
>
>And as already noted, it's easier with a broomstick, which moves more
>slowly and is a better match to the limited control bandwidth of the
>eye-brain-hand system.
>
>                                                          Henry Spencer
>                                                       [email protected]
>
>
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>  
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........ Alex Fraser  N3DER .........
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