For JABIRU 2200 & 3300 engines, the use of a TURBO spinner (with deflectors) is necessary to avoid a rise in temperature of the engine.

New silent propeller

DUC HELICES developed a new silent propeller (5 blades), which will be next certified.
The FLAIR propeller applies for towing, with Lycoming 180 hp engines.
This propeller has been developed with ONERA, a French aerospace lab