It depends on the hardware version of the controllers. version 1 is 12mhz and version 2 is 24 mhz.

With the airplane controllers they are talking about 12 and 24 mhz (12 for the 36120/36150 and 24 for the 3670 and 3695)

Mike; could you please email BK to ask if they have got a 36120 in 24mhz?

I can't find the right user manual right now, but i once read about these controller handling a much higher rpm range on a two pole motor. I'm going to search for that right away.

Guess they don't call me sherlock for nothing..

here it is.

100000 rpm/two pole motor.

The 30/36 cell controllers that are currently available have the rpm limit. BK actually puts a sticker on the controllers that indicate this. They have intentions of addressing this rpm limit in the near future, but as of last week, they had not addressed it yet. I ask them about this when I speak with them (every couple weeks!).

Okay, would you please let me know when they got rid of this limit?

The 3695 and the 3670 are version 2 and work on 24 instead of 12 mhz. So the 3695 would do more than 42k.

I will try my 7XL on 14/16/18 cells first with a centerdiff converted maxx.. (with the warrior controller) it might take some time though, but it will try it sooner or later.

On 36 cells, the 95 amp limit should be more than enough for an e-maxx(over 4000 watts!). Maybe a go kart would need more amps! I will be sure to keep you informed of the new version of the larger controllers(although I have the feeling you will know as quickly as me, Sherlock!).

Mike and his go cart..

4kw x 91%eff = 5bhp Okay, it would blast Candymans Maxxbling right thru the moon.. Though 24 cells and a ' hot' turn motor, is it likely that the controller stays in one piece? (without smoke, or getting black?)

Very likely! The 95 amp controllers are pretty tough (like the warriors). 24 cells would provide plenty of juice to propel Ryan's truck into the stratosphere.

What can i say..

He's just powerhungry..

Ryan, we sorted it out. 20 cells on the 8XL with the warrior 9920, if you got the urge to take your maxx on a trip around the moon, (>20 cells) and like a 42K rpm+ use the 3695 controller.

What's the price on this controller Mike?

I think 36/95 controller could be had for around $375 (my price list is from last year, but this should be pretty close).

I just got in from work, i think I missed half the discussion! Just a couple of questions here. Are we saying the wanderer and the feigao is the same except for the bearings allowing the BK to spin to 80,000 rather that the Feigao's 50,000? if so can the feigao handle more that 18 cells? I thought it couldn't. On BK's site they seem to imply that the wanderer can handle 32 cells?

Also the main thing putting me off running over 20 cells (now we have settled on gp2200's for weight saving) was that I would need a bigger controller (amp wise) but this isnt the case is it? I could handle 24 gp2200's, if the controller is $375. but what can the motors take?

The ability of the motor to handle the cells is dependant on its Kv value (a 5000rpm/volt motor can't take 32 cells, as the rpms would be too high for the motor or controller, however, a 1200rpm/volt motor can easily take 32 cells without over revving). This goes for any motor (Wanderer, Feigao, Lehner, etc.). Amp wise, I think the higher the cell count (using an appropriately "cooler" motor), the less the need for a high amp controller. Most of these motors are most efficient in the 30-40000 rpm range, but they can all take a lot more rpms. The Feeigaos are limited primarily by their bearings (I have exceeded the rpm limit on several Feigao motors without issue).

20 cells are fine with the wanderer 20XL/8 winds and you can use the 9920 controller on this motor with 20 cells.

If you are planning on using a max rpm of about 35-40k, and plannin on using more than 20 cells, I would take the 36120 over the 3695, those last 45 dollars are worth the extra 25 amps imo.

I see, i didnt think it would be that simple!

Rene, is the 8xl on 20 cells giving me the same rpm as the big maxx? my gearing is soemwhat limited. What motor would I use on 24?

The wanderer 20XL8 will give you 2500 rpm's more on 20 cells (38720, bigmaxx/16cells, vs the 41250rpm of the wanderer. The 9XL would give 36674 rpms. (a rough 2000 rpms less, under load.)

But 16 cells or 20 cells are a huge difference in power! (25% more power..)

On 24 cells the 10XL is good choice..

You might ad a tooth on your pinion as well. though running it on 24 cells wil be quite a blast allready..