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Thanks for the reply, Jetwax. Okay, we have pretty much gone with the air hockey idea and RC. I pretty much don't understand the thyristors and PWM thing. I am pretty sure we are going to go with batteries, though. The flywheel and motor shouldn't draw much juice, and building a table with a...

It does seem incredible. One suggestion for how it would be built is to build a factory at geostationary orbit, then have it start building cables in opposite directions, directly toward the Earth and directly away from it. The COG would stay at geostationary orbit, and tidal forces would...

Thanks, rburton. As you say, now I would just need forward thrust. (In effect, I would have a craft like that in the video game Asteroids. You can only point it and thrust forward.) CO2 might be good. The question I had about CO2 is how big 1 kg of CO2 would be at an achievable compression, and...

Thank you blueblood and rburton. It appears fans of any type have lots of issues: torques about their axis of rotation caused by accelerating or slowing the fans, as well as that caused by simply biting into the air, gyroscopic forces, aligning thrust axes (axises?) with the various axes of...

Thanks, Hydrae. Here's what we have settled on. We are going to have a blower floor, like in air hockey. (They are cool with the raised floor.) That handles flotation. For attitude control and thrust, our best idea appears to be battery-powered ducted fans. Your idea of fans blowing into a...

Greg, btrueblood and Rob, Thanks for all your comments and suggestions. The perforated floor was an idea we played with for a while, but I guess it doesn't work with our existing location restraints. We would have to build a new raised floor inside the viewing chamber. There was also the...

Thank you, Scooter and btrueblood. (GregLocock, you suggested I look at the FAQs. Am I not doing this right? Please let me know if I am. karl_chwe_@_comcast_._net, remove the underscores.) Scooter, I have stumbled upon the rc model field, and I think we will end up using some servos and rc...

Thank you, Scooter and IRStuff. IRSTuff, the swivel joint is a good idea. I could imagine a ball joint, at the lower end of the air hose where it attaches to the model, to both relieve both the twisting and the bending forces exerted by the hose. There is still the problem of the weight of...

This is a little outside my expertise, so I am asking you, the excellecnt spacecraft engineering community (or one of them.) Sorry if I use incorrect terminology and such, or if this is the wrong kind of post for this forum. I am a volunteer at the Denver Museum of Nature and Science, in the...