Weird theories and ideas thread! any ideas welcome

Yes, that’s right. I just meant the truck angle sensing doesn’t solve all problems, although it is definitely better.

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What exactly do you mean by that?

I think It would be relatively easy to test both and compare, that could be interesting.

I mean, they’re brushless motors, not steppers.
So is the speed control from an ESC strict enough to absolutely keep the left and right wheels rotating at the same speed, or will it slow down and speed up a bit with more or less resistance even with the same control input?

When you turn a circle its not just that you want the wheels to spin at different speeds, the road is going to be pushing back and trying to slow down the inside wheel, and speed up the outside one.

Just wondering how much this actually happens, and how important having an actually differential system is.

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@kook

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I’ve had this idea rolling in my head for a while. I wanted to use an arduino connected via ppm and/or UART for dual motor set up. I wanted to somehow have a ppm go into the arduino and the arduino would read the current from motor #1, then if the amps get too high it turns on motor #2

What is your intention with that?

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Save power, only use both motors when you want the power. But only use one motor when cruising or slower accelerations

Ok, I see :slight_smile: there have been some discussions if two motors are more efficient anyway though.

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Ny understanding is that the jury not decided whether dual or single makes a significant efficiency difference.

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Oh, I guess I’m just a dumbass. I specifically remember reading somewhere that said “two motors are much less effecient”

Welp… There goes my idea

My second idea, it would be pointless but I always thought it would be really cool if someone made a rear diff for an esk8

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There are quite some posts about this. Like using RC diffs.
But the main takeaway is that you don’t need a diff for running a single motor dual drive on a skateboard (because of the narrow track width), see my build.

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CVT drivetrain, with a manual cable tied handbrake… or a back foot brake like those found on escooters

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Like I said, it’s pointless but it would be cool

I will be very impressed of you could fit a cvt drivetrain on a skateboard

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I’m currently thinking about a foldable board or something similar…
Still just sketches at this point.

I am not a big fan of any perpetual motion machine but for some reason an inertial reactionless drive feels like it should be possible…

^^ seems like should be able to provide the spin the bike wheel/mass part with a motorized drive and then somehow turn the angular momentum/motion into linear motion… if anyone patents this please give me like a million dollars.

^^ It seems like if this was rotating (assume cylinder is a motor) and the rods are say pneumatic pistons and are firing such that as they are turned forward they are always being accelerated in the same direction and then stopping then it would transfer that momentum down into a board (imagine this is running right next to you or you are holding it somehow or whatever, it is on the deck with you nothing is directly transferring energy into the ground, it seems to me like this should work but wikipedia says otherwise)


Now that I’m more awake it feels less possible… dang. Well yah if anyone figures out a way that this would work I’d be curious. Initially was thinking because of pumping moving you forward but that’s from the lateral force between the wheels and the ground also lending way to forward motion I think. It seems you’d always need some “reaction point” to transfer the torque in order to create linear motion out of it outside the system… dang you physics!!!


A third thought I’d like to still experiment with this if still feels like there should be a way to use the rotational momentum to make some forward motion. Imagine he is standing on a skateboard instead of spinner plate when holding the bike wheel and is turning/leaning on the board, would it not want to push him the opposite way, I know I’m missing something here I just can’t quite put my finger on it, can someone tell me something about inertial reference frame or something that makes what I’m thinking invalid (aside from the lack of a place that force is obviously applied between the deck and the ground)… Correction again I see it now, when he spins the wheel he creates a torque around his center of mass because of the equal and opposite reaction but that rotational energy would need some mechanical means to transfer into linear motion, thereby not making it reactionless.

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It would be more than awesome, if someone could build some sort of drive train for standard wheelchairs. Something inconspicuous for not getting to much attention in public, and with a good amount of torque and speed :grinning:
It would be cool to share our fun with handicapped ppl who can just power their chairs with their arms or need lots of money for an electric wheelchair which can only go 5mph or something.
Please Spiderman, DO IT!

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I know I don’t wanna see grandma wheelie her wheelchair

grandma don’t wanna either

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