The gantry was to work by building a framework, with rails constructed from 1x1 blocks. The gantry X/Y axis arms are to traverse the rails with wheels. There would then be some pistons for the z axis, a rotor, and finally a landing gear for grabbing. All pretty straightforward stuff. On something like this, you do not want suspension on the wheels:
When you’re on uneven ground, vibrations can wear you out, making it harder to drive your chair and triggering spasms and pain. Loopwheels make travelling over bumpy ground more fun and less tiring.
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And it's not like I have some high dollar customer sport chair, either. I use a "Breezy". Street price of $575. About as cheap as you an go. (https://www.quickie-wheelchairs.com/Breezy-Wheelchairs/Breezy-Lightweight-Wheelchairs/Breezy-600-Lightweight-Wheelchair/2403p) And the only modification I made was to cut grooves into the solid rubber tires. (They come smooth as a babies butt. That REALLY doesn't work in snow.) Grunchy January 31, 2018 01:30 AM Reason January 31, 2018 05:28 AM
“Selective suspension is the key to the mechanism because constant suspension creates loss of energy, making pushing more strenuous. Only when encountering an object does the suspension system activate, making the inside of the wheel, the hub, move and absorb most of the shock instead of the wheelchair user’s body,” she said.
People have tried to make a wheel with suspension before but they have never had the right combination of design and materials.
“People in the airline industry heard about what we were doing, and asked us to develop landing gear incorporating our technology,” said Barel. “We weren’t sure it could be done at first, but, after doing some work on the project, we became convinced that it could be done, and could save airlines lots of money. We’re now developing the landing gear system, which will eliminate the need for the expensive hydraulics currently used to ensure that a plane lands properly. This technology has not been updated in sixty years.”
The front wheels must be free to pivot on their steering swivels. The driven wheels, whether front or rear, must also be free to rotate with the drive shafts .
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Loving this well made Schwinn! Have many miles of very hard riding on it now and it is holding up well. Zero issues and still functioning perfectly. There is a slight amount of seepage at the front forks but that is normal. I have just about worn out the tires but that is after a lot of miles, most of which were ridden on rough rocky roads with zero flats. Overall this bike is a winner. Well worth the current price.
This looks dodgy. As per above – lateral stiffness? You have what looks like three contact points spot welded to the rim. I like my rims to stay somewhat connected to the hubs. These look like they have potential for rather catastrophic failure. Bob McNaughton on April 14th, 2013 - 11:06pm
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I’m beginning my return and hopefully the next one doesn’t have this issue. Is there something on the user end that can cause this or is this something that was just wrong with the manufacturing? 1.0 out of 5 stars its as if it lost its ability to screw in its socket (it looks more like an issue with the socket and not the actual ... By Manuel on March 31, 2018 Hopefully this is an isolated case but my bike just broke after less than 4-5 hours of use spread across 3 days (normal park trails, no crazy mountain climbing). The right pedal just fell off while ridding and it won’t go back in, its as if it lost its ability to screw in its socket (it looks more like an issue with the socket and not the actual pedal).
You realise in the mining truck example if their estimate of current tyre prices is out by a factor of nearly 3 (as you suggest 38k v 110k) then the whole financial justification falls apart ;) Harmen van Kamp February 2, 2018 12:30 PM
A heads up to politicians and city planners: stop wasting your money on bike lanes, tax incentives, and PSA campaigns. All you need do to persuade your constituents to trade in cars for bicycles on their morning commute...