Maddness

[coolhandcountry]

Don't the esc need a feed back from the motor to work. You would need to do something like a sensored for it to work out.

[BrianG]

Originally Posted by coolhandcountry

Don't the esc need a feed back from the motor to work. You would need to do something like a sensored for it to work out.

Yeah, I kinda forgot about that. :dft001: There may be a current-sampling coil or something on the motor wires that picks up the PWM AC signal. The switching frequency and current of the ESC outputs is high, so only a few turns around each lead would be needed. The only other way to pick up a current-sample I can think of is to use a VERY small value resistor and measure the voltage drop. But that would be less efficient, especially at the high currents these ESC can pass. Either way, I suppose re-locating the sampling coils to the outputs of the V/A amp, or calculating a new sampling resistor value to put at the outputs of the V/A amp would work. Then, feeding this data back to the "brain". Unfortunately, I don't have an ESC I can pull apart to see.

MOSFETs are voltage driven, so there would be VERY VERY little feedback from the V/A amp if you counted on them to provide feedback.

Well guys, my supermaxx is due to be finished before xmas. I've thought about doing the 3080 maxx for a while now, and decided that if I can find a 10S lipo 3080 compatible ESC, then the project will be started after I have finished my Supermaxx.

The truck will run all stock except for pinion/spurs (obviously) and I will 'try' to run a G2 chassis. The motor mount is my only real problem. Mike would you be up for making one? If so, i'll get a 'Sponsored by RC-Monster' shell for it, just for the thanks. The truck will ride as low as possible, using 4 UE SuperShocks. Not sure about tyres, maybe 40 series road rage's. Shell will be a proline crowd pleaser. I may run a wing if I see any hint of the truck lifting.

As far as lipo goes, done anyone know what I should use?

Now; I know that promod used dual 2240's and 8S lipo to reach 80mph. I'm 'hoping' that this truck will break into 3 figure speeds. Would this be reachable, I think so.

I know im going to get 'it wont turn' type comments, and i dont want it to. It's purely a straight line truck and will probably be sold not long after i've reached the hundred. Once the truck has been done, I'm gonna contact one of the rc mags and see if they can do an article on it. I will get video footage of the truck without a doubt.

This is gonna be like a jet fighter engine in a bicycle :)