I need to know how I can plug my Duratrax ice charger into a wall outlet or something. Anyone know? I will be using it to charge my airsoft batteries. After looking around, I learned — You need a 12V power supply with enough amperage to power the charger. I picked up a used 1/18 [...]

Although I've seen model helicopters flying upside down, I've often heard that real ones can't sustain inverted flight. Are there any boffins who could explain all the reasons? I've heard that flexible blades or hinges would lift the blades too high and risk cutting off the tail boom. But are there other problems too? Wouldn't [...]

What is the difference between a 3 phase 16step/rev stepper motor in comparision to a DC-brushless motor with encoder but without hall effect sensors? Please help. After looking around, I learned — In some configurations there is very little difference. Reasons follow: Stepper motors by continuous encodings or a stopped (addressing) code provide a rotating [...]