Quoted: It would have to have closed sides to keep out mud and snow. This is a "look at how I work" version I think.
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Could be...makes sense... I thought I saw a tv program on this, however, and none of them had enclosed sidewalls. In fact, the program suggested that automobile apps were quite a ways off but that the tweel would be easy to implement on wheelchairs, segqays, skid steers, etc. The program specifically noted problems with muck, etc. getting in the wheels and wreaking havoc...unbalancing them being the most notable malady.
Although a sidewall could be added, I believe that such a solution would take away one other advantage engineers were trying to give the tweel. Because oit doesn't need to hold air, you could have holes in the surface of the tweel to prevent hydroplaning. If you add a sidewall, you have to add a baffle since the sidewall cannot cover the hub/axle on a modular wheel. The hole where the lugs went on both sides would allow debris into the tweel.
Still, you can't aska question on arfcom, even in jest, without some smart aleck giving an answer, no matter how imperfect.
p.s. I believe there was a thread on this in GD some months ago, not long after I saw the tv program. I think I saw it on discovery when most of the shows were still good and not 'reality tv' or home renovation