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In lugnet.technic, Rob Stehlik wrote:
> In lugnet.announce.moc, Kevin L. Clague wrote:
> > After reasonable feedback about the complexity of my first reversible pneumatic
> > engine, I realized there was a very simple mechanical solution that would give
> > reversability *and* variable speed.
>
> Wow! I saw your first reversible engine and I kind of got lost in all of the
> tubing. Needless to say, it was quite an accomplishment. Its amazing how far you
> have been able to take the analogy between pneumatics and electronics. But, I
> kept thinking that a mechanical reversing mechanism would be simpler. Your
> differential solution is very slick.
Thanks.
>
> Let me see if I understand everything correctly... By adjusting the position of
> the differential case, the phase between the valves and the cylinders changes.
> But the phase between the two valves relative to each other remains constant. Is
> that right?
Correct.
>
> One thing I'm not sure I understand is how this setup allows the speed of the
> engine to be adjusted. Is it because as the timing is changed from one 'ideal'
> position to the other, the engine runs rougher when the timing is off? I suppose
> this would slow it down, but its not exactly an ideal method of speed control :)
Right ;^)
>
> I am also dying to know if you can reverse the engine 'on the fly' Meaning that
> the engine is connected to a compressor and it is first run forwards. Then the
> timing is slowly adjusted until the engine stops momentarily and then begins
> running in reverse. That would look really neat. I just may have to build one of
> these..
Yes, you can reverse the engine on the fly. It doesn't take much to make the
engine not run. It takes a quarter turn of the case to get from ideal forward
to ideal backward.
> Rob
Kevin
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