The SSS Motors Thread


Im using a Neugart PLE40 5:1. Its rated to 14Nm nominal and 22Nm Max. My sss360 will never give that much torque to the gearbox. Only possibility is giving it too much RPM or heat as a result. What do you know about the relationship between torque and RPM into these gearboxes? have you killed a few? Id really like to understand this a bit better.


I have a new Neugart PLE40 5:1 siting here on my desk, I have not used it yet. I have gone through two reduction gears already, they just failed under use and I’m not really that interested in reduction gear design right now, my focus is direct drive. These reduction gears just can’t handle high rpms and the heat that comes with that.

You could limit your rpms with controller to keep them lower, and upsize the prop but then prop is getting really big and takes up a large part of your mast length, and more drag with larger duct as well.


Yep, Im fully aware of your focus on direct drive. If that’s all you want to talk about, that’s cool.


VeFoil - Were your previous gearbox failures Neugart or Parker or another brand? Reason I ask is I have seen a number of mentions of Parker gearbox failures on this site. But none for Neugart.


You are correct, the Neugart seem to be better which is why I got one as well. My others were no name brands.


@sunrise305 But with the same kv there are also differences. For 790kv the datasheet looks actually very similar, except for the 14kv - 11kv discrepancy. Which is a bit odd because chinese seller normally tend to exaggerate, not understate: Chinese vs German.
For other kv the datasheets are again very different.
@michion the shaft should not make a noticeable difference, the weight for the two 790kv motors above is also the same.
@VeFoil The 56114 is yet another story, the german shop has those too. Their datasheets match up more with the chinese ones. But I didn’t understand the motor itself, it has 1kW less power and 5k max RPM less, isn’t that only a very small increase in torque? Or is it higher in lower RPM?


I bought a Chinese 360Kv 56114 and the German 350Kv 56114, apparently the same, 350 rotor is a few mm longer than the 360.
This is adjusted by different bronze spacers on the shaft, 350 is still in its box, so I can’t tell how it perform.
I found the 56104 being rated 11KW and 56114 13KW.


Hello, can you tell me the diameter of the screws on the motor shaft SSS 56104: M3 or M4?

thank you


When you say screws on the motor shaft not sure what you are referring to. There are six M4 screws that mount the motor to the MotorGearboxMount. The shaft itself is 8mm and there is an M3 cap screw on the gearbox that binds the motor shaft.




Yes those are M4 x 10mm