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ZEbbEDY

Hiss Drive Equatorial Platform

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Looks interesting but I'd feel very deflated if it didn't work :-)

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Oh that is genius! You have gotta love the pure simple idea behind that.

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I've made one. It worked very well at moderate magnifications. I then broke it up for firewood when I brought my GOTO mount.

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I don't really understand how this works but it clearly does. can anyone summarise?

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I wonder if a similar system could be made with water? No need to use a pump if it could.

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I don't really understand how this works but it clearly does. can anyone summarise?

It's a simple eq platform but instead of being driven as such it's gravity fed as the inner tube slowly deflates ...

Now I'm thinking was Shane asking in jest ? And am I now looking stupid ...

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no it was a serious query. an equatorial platform drives from one side of a conical section to another. but this will surely drop from the top to the bottom as the tyre inner tube deflates. actually in thinking about it, I have sussed the mechanism. the hiss drive does indeed drop but presumably also as part of the same conical section, just vertically rather than horizontally - it makes no dofference of course.

the final thing I don't get is how the arc is controlled?

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If you look at the bottom photo it's like a barn door tracker ... The weight of the ota pushes down and the inner tube deflates at the rate you choose with a regulator valve

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ahhh, I see, there's a hinge on one side. seems to be a good idea. might try to make one.

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zombie thread resurrection sorry, but that is quite brilliant 😀 Bit of a pain to have to re-inflate it after an hour and it adds a lot of height but what an ingenious solution- right down to the air damper for damping out the springy vibrations you'd get. Fantastic :)

Mark

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Peter Drew's comment on a possible water variant also deserves this thread's resurrection. :)

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On 26/03/2014 at 21:04, knobby said:

Looks interesting but I'd feel very deflated if it didn't work 🙂

Finally ...6 years and it gets a laugh 🙂

Thanks @kbrown 

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