Those motors are sexy, why the need for a fan though with those huge fins on it?

Plettenberg Big Maximum (HP 220/40/A2 S P4 Car)
is a 4-pole motor.
bearings are rated at 70000 RPM, but not the motor efficiency or power...

Motor specs at 18V:
Power - 1271W
Current draw - 70.3A
RPM - 37688
Torque -28.9Ncm
Efficiency 89.8%

max efficiency (91.5%) at ~45A / ~40000RPM / ~18Ncm

Motor can be pushed towards 2000W but efficiency falling dramatically, though great cooling system keeps it from falling apart.

I think the Bigmaxximum is a 6 poler motor. If you look at the first picture on this site http://rc.stuurmijmail.nl/Bigmaxximum/index.html you can see 3 bumps which are the magnets and that is half of the rotor.

I will trust Plettenberg catalog :)

They are only mentioning the Maxximum. The BigMaxximum is 6 Poles.

You can get HP220 series motor with 4 or 6 pole magnet, but I thought that 6 pole was not for cars, but for planes and helis. It would be worthwhile to check that.

On the other hand it would be hard to imagine schulze ESC running 6-pole motor at 70000 RPM, while heli's versions were limited to 35000.

Some ESC will do the 70K rpm with a 6 pole motor, but that would be insane (I got to try it one day LOL). My Plet Extreme is 6 poles and it made my TC3 faster than a fully loaded HPI Pro4 with a Novak 3.5 system in it. I used my MM with 11.1v 5000mAh and the 11.1v 2200mAh KongPower packs. The RPM with no load / volt: 4600 1/min, so it could've been spinning at 45 to 50K rpms loaded.

i thought the plett extreme and shadow are both 4 poles and the indoor was 6 poles.

I cant find any info on that though so correct me if i am wrong.

The Extreme is 6 poles. I have it open to change the bearing.

Regardless, 6 poles, 4 poles, it is not going to change the power output, which is all that matters.

It might not change the power output, but it will certainly have more torque.

Usually, a higher pole motor will have more torque, but a 4 poler can have more, even a 2 pole.

Ex. - Does a Neu motor have twice the torque of a Lehner motor because it's 4 pole, certainly not. :wink:

It's hard to compare Neu and LMT because they are totally different. Neu is 4 pole but uses slotted stators. The LMT is 2 pole but uses "air core" stators. Each type has advantages, but generally anything in that price range will be VERY similar performance-wise.

does the plettenberg shadow have 6 poles as well or is that 4 poles?

Something else to consider is gearing limitations. A motor spinning at 60k and geared for 40 MPH will deliver more torque to the wheels than the same motor spinning at 30k and geared for the same 40 MPH.

A 2 pole motor spinning at 30k RPM and geared for X top speed should deliver less torque to your wheels than a 6 pole motor of similar size/weight spinning at the same speed and geared for the same top speed.

Many people here target 30-40k RPM motor speeds because of gearing and top speed practicalities. But it's usually easier to gear high than to gear low, so a low Kv, high pole count motor is preferred IMHO. A high pole count motor naturally spins slower which allows you to get more torque to your wheels because you don't have to gear so low to get the mechanical torque advantage. A 6 pole or more motor should work great. I'm going to be using a Neu 1900 which is 8 poles.

I was looking at these Plettys a while ago and I seem to recall that the Neu motors looked more efficient on paper, so decided to go Neu.