Blue Robotics

This company makes underwater thrusters for submarine applications. With their first thruster they made it easy to make a homemade submarine. The motor was powerful, the thruster just worked. They even had a promotional where they created an automated surfboard that made it from hawaii to somewhere in california with one of their thrusters pushing it there the entire way. It was a great product.

Then they created the next version. This was the same thruster, but it had an ESC(Electronic Speed Controller) sealed in an aluminum puck on top of the motor. This ESC could be controlled by servo controls, or by plugging it into an i2c bus. You could pull different stats off of the motor over i2c it sounded great. So my robotics team trusted this company and bought 8 motors at $220 - $250 bucks each. We lightly tested them since we had not even finished the robot yet. One week before the competition our robot got completely put together and we did our first few tests.

Long story short, Us and 22 other teams did roughly the same thing. We bought these motors expecting them to work, but instead the potted aluminum ESCs were found defective. Water somehow got into the completely resin sealed aluminum puck and destroyed the ESC. We didn't qualify that year due to trusting a competition sponsor to deliver a good product. I will admit that it was our fault for not testing them before going to the competition. Lessons were learned and an inherent distrust of every product I come across was developed.