Weird theories and ideas thread! any ideas welcome

professor_shartsis · June 23, 2019, 5:48pm

completely separate throttle then? 2 handed operation? 2 finger? finger thumb?

aaron · June 23, 2019, 5:49pm

could be a deadman switch with the function of starting the 3rd motor

professor_shartsis · June 23, 2019, 5:50pm

how is that different from a button that chages the amp limits aside from added weight/cost?

professor_shartsis · June 23, 2019, 5:51pm

right, you’re producing eddy currents in the stator and this resistance gets higher the faster you go…

professor_shartsis · June 23, 2019, 5:52pm

but you still need a separate throttle or switch

aaron · June 23, 2019, 5:55pm

maybe not. @mmaner is creative, he can probably come up with a different solution.

professor_shartsis · June 23, 2019, 5:55pm

perhaps an angle sensor that engages the 3rd motor when the board tilts beyond a certain degree?

Komamtb · June 23, 2019, 5:56pm

A remote controlled…horn.

KaramQ · June 23, 2019, 6:02pm

10 tooth wheel pulley, lol

mmaner · June 23, 2019, 6:12pm

Dude, twice I’ve said that the solution is increase the deadband on input so the motor only activated when you drop into the throttle.

professor_shartsis · June 23, 2019, 7:06pm

I fail to see how this would offer any significantly different performance outcome than simply using a slightly higher battery current limit and retaining your existing motor current limit and motor quantity.

mmaner · June 23, 2019, 7:08pm

I don’t know what to tell you, I think @deckoz explained it beautifully.

Skunk · June 23, 2019, 7:10pm

wdg0MXT

stratoglide · June 23, 2019, 7:12pm

Wouldn’t the motor still kick in on flatland if you’re throttling hard?

And using a one way bearing might be a bit jerky when the motor needs to move from standstill to match whatever rpm you’re traveling at no?

More experimentation is needed to see how this should be implemented.

And at the end of the day will the extra weight and complexity of the system be worth it, all things that need testing!

Arzamenable · June 23, 2019, 7:18pm

[quote=“randomhobby, post:16, topic:2426”]
what about using quick release latches o rc car pins for mounting the battery enclosure
[/quote]

Arzamenable · June 23, 2019, 7:21pm

Weird theory: never ever wear mismatching socks. That’s how you break an ankle.

professor_shartsis · June 23, 2019, 7:26pm

@mmaner ^Here we have a theoretical comparison of your dual hummie hubs @ 12S and 60a motor current limit per motor… the comparison is between 30a and 60a battery current limit per motor. Take a look at the yellow line, bottom left chart (vehicle thrust in pounds – 2 motors).

mmaner · June 23, 2019, 7:31pm

Zero experimentation had been done, we are discussing it to define what the best approach would be if any.

stratoglide · June 23, 2019, 7:42pm

Haha yes more experimentation than 0 is needed. My concerns would be how it changes acceleration on flats and how rpm matching would work with a free rolling system.

Hopefully your testing proves useful!

Skunk · June 23, 2019, 8:10pm

I was wondering when we’d start getting graphs.
Its not a @professor_shartsis post without them