Quote:
Originally Posted by Tat2
I asked him further about what he's trying to do and he apparently wants to test the limitations of the VXL-3S before dropping a MMM into his Rusty. Which means that he wants to run a motor that many might consider inappropriate for a Rustler. This is what he e-mailed me: "...thanks. Being able to use this calculation to get in the "ballpark" will at least help to narrow it down a little. I wonder how Traxxas came to the amperage draw of the vxl, since it is used in more than one vehicle, none weighing the same, and all come stock with different gearing? Same with the vxl3s esc, according to Traxxas it's rated for multiple times what the motor draws, so a guy would think that it would never come close to having heat problems using th vxl motor, but I've heard of guys going thermal on the esc using the vxl motor, which should mean that they would have had to come close to the limits of the esc. Lol. What was Traxxas's theory behind having an esc that is overkill for the motor? That's kind of what I want to find out by buying another motor. I would like to see if the vxl3s can really do what it says it can do. I am planning to switch over to a castle mmm powered setup, but I want to explore the "supposed" capabilities of the vxl3s esc before I swap it out."
 I'm still not entirely sure why he wants to do this, but it's not my place to question what he, or anyone else wants to do with their vehicle(s). |
If his objective is to test his VXL-3s to destruction, rather than just choosing a motor for his rustler, the questions make more sense.
If that were my objective, I wouldn't try to calculate a motor's amp rating (which only means how much it
can take for a certain period of time, not how much it
will draw in any given situation - again asking the wrong question), I would just get the biggest (and least efficient!) motor in that would fit, get a data logger, and keep increasing the load on the motor with gearing changes and lots of lead weight. Eventually the ESC will pop, and he will have the info from the data logger.