Propellers are available with a choice of five blades (for low to medium pressures,) or 10 blades (for high pressures) of either glass-reinforced polypropylene or pressure-cast aluminum, mounted in a ...

Oddly, the stock fan was also a little quieter overall, but the MIT-inspired blade was quieter at high frequencies. Static pressures were a good bit less for the new design.

The problem was that the rotational speed of the propeller was limited to only a few hundred rpms because the blade tips could exceed Mach 1 by only a small fraction; above that, efficiency plummets.

MT-Propeller Entwicklung GmbH has received the STC No. IA-719/2020 from AFAC Mexico for the installation of the Quiet Fan Jet composite propeller MTV-5-1-D-C-F-R(A)/CFR210-56 on the Cessna 206 ...