The helicopter one is not heavy really but it is FAST and powerful (way too much power). I will track down the widow maker soon and take a video of it running, the sound alone reminded me of a dental drill. You may want to look more for model train motors, they usually have a good amount of toque and wont be stupid fast. Many of the model train shops will have precision brushed motors of all kinds. The main thing to make sure when you are picking one of these is that the axl is connected at both ends. Have played with some cheap motors that the brushes would hit the walls of the can wall and spark and smoke. Any kind of whip shading motion would make this happen. I have a machinist friend who is also a model train buff and he likes slow and powerful so when you up the volts the train looks like its accelerating in real life. He suggested the helicopter motor would probably be dangerous... he was right.