Of course, this is only a demonstration of making a single blade for a prop. The next trick is turning that single blade into a propeller. This is done with a cleverly machined hub, attached ...

An efficient propulsion system, developed by a Tennessee-based company, is soon expected to power a single-seat glider.

Test results of the different boat propeller designs. (Credit: rctestflight) Interestingly, the 2-blade FDM-printed propeller ended up performing the best, while the bi-blade design (with two sets ...