The video notes that when printing 4 props, 2 must be reversed in the Y-axis to print a counter-rotating set of 4. The instructions used for creating propellers in Fusion3D are available here.

Gladding-Hearn Shipbuilding, Duclos Corporation has delivered a repowered pilot boat, after 10 years of continuous service ...

After 10 years of continuous service in the port of Charleston, the 65-foot pilot launch Fort Ripley has been delivered to ...

The aircraft’s performance was due in part to the giant, counter-rotating propellers, says Bowers. “When you start blowing that amount of air with that amount of power over a fairly large wing ...