inrunners or outrunners

[craig_colliass]

Just for reference on MOD1 gears, the Lambert gearboxes on Gabriel that have the big Ampflow motors driving them, with the big and I mean BIG wheels 900mm diameter have first stage MOD1 and second stage MOD 1.5 these are a standard gearbox which is not nearly as good as an epicyclic (sun and planet) style gearbox.
so MOD 0.6 for the first stage and MOD1 for a second stage should be OK if you don't go silly on the power!
Remember when dealing with drives for combat robots, the limiting factor it the GRIP of the tyres. you can have mega power slides that look cool but that alone doesn't win fights. if you keep the power of the unit equivalent to about 1.2Kw brushed that will be enough for most applications. if you want another Brutus just have 4 of them!

[Rapidrory]

the Lambert gearboxes on Gabriel that have the big Ampflow motors driving them, with the big and I mean BIG wheels 900mm diameter have first stage MOD1 and second stage MOD 1.5

I know people who have stripped MOD 1.5 on a Bosch 750 before... I just assumed MOD 2 was the standard for heavies. Impressed that the MOD 1 gears are working that well!

With brushless, it's worth bearing in mind that it's better to over spec the motor and run it below it's max power, as they have a lot less thermal mass to spread the heat due to being tiny and powerful. Most of these motors are designed to have a constant stream of air, EDF motors especially. Without it it is likely to get red hot if run at it's specified power rating. I'm looking at a minimum of 3kw motors for drive, and then limit them to ~1.5kw on the VESC, but if suitable cooling can be sorted then you may be able to use less. It's yet another one of those things that needs experimentation and combat testing to work out what size is right. (alternatively I could sit down and do some maths to work it out... but who does that? :L)