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The other day, Matt Denton posted the first video in a short series about his D-O build (below), which is a modified version of Michael Baddeley's design (so he doesn't break his NDA).
Conveniently, about 8 seconds in there's a snippet from the stage droid appearance, in which you can clearly see the center wheel rotating.
Whereas Michael's design has the tire recessed so it doesn't strike the ground at all, Matt is making his more like the stage droid, using a similar solution to what we discussed in the early threads and Envisaged was testing here.
Later in the video, you can see that Matt has the center wheel freewheeling on bearings mounted around the outer rim of the large gear (the one that rotates the green side rims used for actual propulsion).
Here's Matt's video:
Conveniently, about 8 seconds in there's a snippet from the stage droid appearance, in which you can clearly see the center wheel rotating.
Whereas Michael's design has the tire recessed so it doesn't strike the ground at all, Matt is making his more like the stage droid, using a similar solution to what we discussed in the early threads and Envisaged was testing here.
Later in the video, you can see that Matt has the center wheel freewheeling on bearings mounted around the outer rim of the large gear (the one that rotates the green side rims used for actual propulsion).
Here's Matt's video: