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<div>Thanks, but I think that 1 1/4" (the diameter of that Pallet Master caster) is still too thick for this situation. Plus, I suspect the static friction (the friction that has to be overcome when most things are starting motion) will cause a noticeable jerk when motion starts. Air casters don't have that start-up friction.</div><div><br></div><div>But, I will certainly keep that caster in mind for the future. As long as you have wing space, that may permit an very low wagon.</div><div><br></div><div>Regarding my initial air-caster concept, I spent a few hours this evening trying a more elaborate set-up. I tried it on a concrete floor, and really has zero results. The test rig was a 3/8" thick plywood square about 28" square. I taped a thin gasket to the perimeter, by cutting some 1/2" wide strips of underlayment foam, which was about 1/16" thick. The 1st effort was to put it at only the perimeter, then the 2nd attempt, I divided the bottom into two, with another strip of the gasket. The pressure should have been enough from just the CPAP machine, to lift my own weight. I could detect some Air flow coming from the perimeter, and I could feel the wood flex up, as the pressure built up underneath. But, no ability to glide, even if it was only the weight of the wood.</div><div><br></div><div>I also tried some variations, all without success. Air from our compressor, which I didn't expect it to work because of the lower volume of air. I also used a 120v air mattress inflator, which was able to generate similar air pressure to the CPAP machine, though of course, much noisier. I think it had a bit more air flow.</div><div><br></div><div>I suspect that my somewhat stiff gasket meant that the air had too easy of a path out from the perimeter. Perhaps I gave up too soon. I realize now that there was a room next to where I was working that had a smooth polished floor. On stage, I might have used a piece of linoleum.</div><div><br></div><div>If I want to try again, I think I may try out a much more flexible seal. If I really wanted it to be a lot like the ones used in hovercraft, I might try pencil balloons. But, then it might be susceptible to the "tweeting" you sometimes get from them. I recall that at Sight & Sound theater in Strasburg, they used to use air casters on their Noah set. When they moved them behind the curtain during intermission, I recall hearing an audience member say "I think they are bringing in the birds now".</div><div><br></div><div>-Joe<br></div><div><br></div>
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On Thursday, October 4, 2018, 10:09:59 AM EDT, gbierly--- via Stagecraft <stagecraft@theatrical.net> wrote:
</div>For what you are suggesting I would think the Pallet Master caster sourced from Rose Brand would make the lowest profile platform...<br clear="none"><div><div dir="ltr"><div><a href="https://www.rosebrand.com/product2682/Pallet-Master-Caster.aspx?tid=3&info=Cup%2BSwivel%2BCaster" rel="nofollow" target="_blank" class="">https://www.rosebrand.com/product2682/Pallet-Master-Caster.aspx?tid=3&info=Cup%2BSwivel%2BCaster</a></div><div><br></div><div class="ydp56d81e51yqt1592442642" id="ydp56d81e51yqtfd65244"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none"><br clear="none">____________________________________________________________<br clear="none">For list information see <<a shape="rect" href="http://stagecraft.theprices.net/" rel="nofollow" target="_blank">http://stagecraft.theprices.net/</a>><br clear="none">Stagecraft mailing list<br clear="none"><a shape="rect" href="mailto:Stagecraft@theatrical.net" rel="nofollow" target="_blank">Stagecraft@theatrical.net</a><br clear="none"><a shape="rect" href="http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net" rel="nofollow" target="_blank">http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net</a><br clear="none"></div></div></div>
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