Due to some short cables, the rig was operated from only a few feet away, even at high power levels.  This was terrifying at first when we had no idea if anything would break/fail (nothing ever did).

Late night thrust testing

You can see the whole rig here - batteries, controller, motor, belts, propeller, and carbon fiber duct

At one point we had to take the whole rig to the company we bought the motor from so they could check why it wasn't generating as much power as they claimed

At one point we had to take the whole rig to the company we bought the motor from so they could check why it wasn't generating as much power as they claimed.  It was pretty absurd to be running a giant fan in the back of a truck.

The foam core of a test duct we made to try a different shape and see how much the efficiency changed

We eventually mounted the new motors for the Mark III on the rig to test and calibrate them using custom adaptor plates

The battery pack powering the TTR was 100Ah at 84V - it was designed for an electric car

The rig generated so much power it would sometimes bend parts (in this case an aluminum key in the drivetrain)

Preparing to pain a new test duct!

The original belt configuration.  This was eventually simplifed to a single belt.