At 02:55 PM 10/2/02 -0500, John Carmack wrote:
>At 12:49 PM 10/2/2002 -0700, you wrote:
>
>> The current valve plan is to use standard manual ball valves
>> driven by stepper or servo motors. These achieve acceptably fast control
>> without the massive continuos current draw of a solenoid valve.
>>
>> -p
>
>Are the KZCO valves too much of a price premium for you? I'm sure you
>could set up a pot feedback servo system for somewhat less money
>yourselves, but I have been very happy with the KZCO units. I just bought
>five more recently, in preparation for our building a big differentially
>throttled vehicle.
At this point, my understanding is that the answer is yes. They
are also a bit on the heavy side for POGO. POGO is a *tiny* vehicle -- only
20L of peroxide and four 37-lb thrust engines. We've been discussing using
lightweight steppers or R/C servos.
-p
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