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Its a little vague as to whether any actual damage occurred. The guy said he was going to send the fire department a bill but it doesn't say what for.

I totally agree with you about not being an ****. However, I don't think that gives the fire department the right to destroy his property.

Inductance in brushless motors is ... complicated. Using an LC meter like this on brushless motors is of little practical use, in my opinion. They usually give inductance values that are too low. For what you are doing I guess it is fine, although it would be better just to use a low...

Here are the main differences you'll see: Motor type: Brushless motors require an ESC made for brushless motors. Brushed motors require an ESC made for brushed motors. You can't mix and match. Voltage: Usually ESC's work for a range of battery voltages: 2S-3S, 3S-4S, 2S-4S, etc. Your ESCs...

Kv is a property of the motor that doesn't change with what prop you have. If manufacturers use applied voltage, then the best way to specify it would be to apply 1 V, measure the RPM, then apply 2 volts, measure the RPM, etc until you get enough points to make a best fit line of RPM vs...

In my world we don't talk about Kv, we talk about Ke - the back-emf constant. This is just the back-emf voltage divided by RPM. As I've been getting into the RC world, I assumed Kv was just the inverse of that - (RPM)/(back-emf voltage). However, everything I read seems to treat Kv as...

For general sizing of motors, volume is more important than surface area. Some people use rotor volume and some use stator volume, depending on the type of motor and a number of other factors. D^2*L is often used to size motors. Anyway, according to this the KDE motor is rated at 1375 W and...

A slight burning smell could be almost anything and it doesn't necessarily mean something is wrong. Slightly overloading a motor will not cause a motor to fail. A general rule of thumb for insulation in a motor is that for every 10 degrees C that the motor goes over its rated temperature, the...

Regarding wind turbines, I don't think you can draw any conclusions from them. One reason to use 3 versus 2 on a wind turbine is because wind speeds are much greater at higher altitudes than lower altitudes. If you have a 2-blade turbine that is located vertically at 12 o'clock and 6 o'clock...

We actually don't do much in either of those industries. Some off-road construction, some agriculture, some medical, but mostly just general industrial type applications - pumps, fans, etc. (I design a lot of induction motors, too).

I just thought I'd introduce myself here. I have zero experience with RC in the past but I bought a Cheerson CX-10 a few months ago and have been having a lot of fun with it. I'm hoping to start a build on a larger quad soon. I'm an engineer who designs brushless motors for a living, so I'm...