I guess it works kind of – Gear Speed - Brushless RC Speed Calculator Review

It doesn’t state what size can the motor is or what type of pitch the gears have and there is no way to change it. It doesn’t even say what the can size is that the entire app is based off of. If they would fix this it might be worth something but I guess.?
Review by johhny dane on Gear Speed - Brushless RC Speed Calculator.