Help. Boat propellers pulsate at full throttle
This is my first post and I am hoping someone might be able to help me out. I recently purchase a remote control boat and am having problems with it. It is a Superlative Mosquito Craft 7007 7.2V RC boat. The problem Iam having is that the boat works great when I am going slow but the minute I push the controller to full throttle the propellers start to pulsate and the boat goes nowhere. Then minute I back off the throttle it goes back to normal. Can anyone please tell me what could be wrong with it or what I would even start to check into? Thanks for your help.