Hey everyone, I've been following this topic for the past year or so and have been looking over it and thinking on it. Jelmers' idea has merit, as they don't necessarily need to be fully self powered, especially at such an early stage of development. Four small and independent motors per skate (or more, depending on the skate itself), as in one per wheel, would work also in conjunction with the fore mentioned idea also. By decreasing the work each motor has to do by not solely relying on the motors for movement allows for less power to be consumed over time. This is opposed by the addition of more motors, but more torque can be created overall with more motors, thus making them work fairly better when running with the weight of a person on them.
It was previously brought up that brakes could be a problem, and especially suspension (a good and efficient suspension would reduce the stress on the motors by a large margin, increasing durability. This may be at the cost of a higher weight though.) in regards to placement. I do agree that this is a notable problem that needs just as much, if not more, attention as the motors and power supply: speed and run-time mean little if the parts break or if the setup cant stop.
Any input regarding either of these? ^^^
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I was just looking around as some small servo motors and I have a possible idea for the setup of both the motors, brakes, and maybe suspension. With how most of the small motors that might work for this application are set up, they need a fair amount more room than a feasibly sized wheel would provide. The idea I am proposing is that there could be a primary suspension setup that goes directly from the skate to the wheels, and then have the motors extending out slightly from the sides of the wheels with a setup for controlling them included. This would be somewhat independent from the skate as a whole to avoid shock damage through a small suspension like setup that would connect the upper part of the assembly to a point higher up on the skate. It may be bulky but it also may work as it would allow for either bigger or longer motors to be implemented, thus allowing more speed and torque.
Also, keep in mind that these skates don't necessarily have to be identical to actual Air Trecks, they only need to function enough to be a proof of concept so this can all move forward. While a small setup mostly contained to the wheels that goes faster than say 30mph and almost entirely, if not entirely, self propelled sounds amazing, it is not feasible at the moment. As I said, we need to make a functional prototype/proof of concept first, even if it isn't fully self propelled or some thing of the sort like "real" Air Trecks.