I heard lead becomes a superconducter at near absolute zero temperatures, just make yourself a better cooling system and start making the ESCs in China :lol:

Talking about carbon nanotubes, I've heard that heatsinks made of carbon nanotubes fare better than Alu heatsinks. Will castle be using carbon heatsinks on escs one day?

Perhaps better suited for the marine escs then? lol


w/o searching thru the last 10pgs, what's the answer on the MM to MM-Pro upgrade option?

I'd love to tell you how we load and unload the motor in the surge tester, but we consider that to be a trade secret (we spent a lot of engineering time developing the surge tester, and don't want our competitors to know how we do that type of testing.) Sorry!

There will be an MM to MMPro upgrade path -- but probably won't be available until we clear through the current order backlog.

Just a random guess but couldn't you wire up two brushless motors connected by a light flywheel and then use one motor/esc for power and the other motor/ESC for brakes...

Just a random thought on how you'd get the load to pulse so quickly...

ps dropped you an email about brushed drag brakes again...

Thats cool, I thought it might be, but can't hurt to ask. I figured it would be something like a shorting and opening the windings of a slave motor, but like the question of how many licks does it take to get to the Tootsie roll center of a Tootsie pop, the world may never know.

Thanks again

Jeff

Thats effectively what the second motor would be doing the fets would be shorting the phases creating the drag - I wouldn't think you could short on the primary motor as you'd be shorting the esc...

Any chance at A MMM to MMP downgrade?

I'm reading some good things at this moment on Carbon Nanotube. A couple of comments in this article says, "electrical conductivity is sufficient for good EMI shielding and for replacing copper wiring for some application" and "the material can be further doped to increase electrical conductivity to enable conductor and EMI shielding application that require high conductivity". it'll be nice having traces handle extreme currents and also have the ESC run cooler with a awesome heat sink out of the same stuff. This thing has about seven time better thermal conductivity than copper on a per-weight basis. I've seen places making the nanotube, but in very small scale and this one company is making rolls of this stuff.

Edit: Also, how would one mate the MOSFET and other components to the nanotube traces? (Did some more research and found the answer, awesome stuff).

That's why I said the slave motor. The primary motor would be driven normally the slave would be shorted to load the primary motor and ESC. I actually made a setup like this for the stepper we use in our Sonic conveyor.

I would short the stator windings and run them, the weird thing was that the faster I went the lower the load got. Now I just run them on an old conveyor with a 24VDC brushed motor with a wheel attached to the shaft and running on the conveyor belt. I vary the load with a 50 ohm 25 Watt pot. It loads the motor to it's 4 amp limit.

I have a lot of problems with these motors in the enviroment they are in and wish I could get a CM-36 sized motor with about 19Kv to run with one of the phenoix controllers (with serial I/O).

Oh ok - now i understand what you meant my slave motor - Thats exactly what I was thinking but with an ESC controlled slave...

Patrick mentioned IIRC that the load is pulsed ultra quickly - using a second ESC would enable this very easily as the FETS actually "pulse" break anyway...

Any news on the 12S controllers?

I could not find a dedicated thread about them.

I really want to use one of these to power a 1/5 scale car.

The new Phoenix ICE HV models with car software is what you will want then.

I see Tower's expected date on these has gone from "mid September" to now being "late December". Is this an error, or has there been some delay?