One of my dreams is to buy a Catto propeller for my little Zenith so Wednesday evening I watched the EAA webinar given by Craig Catto called Top Propeller Designs. The first half was an interesting review of the propellers he has designed and made for everything from NASA experimentals to Reno air racers. The second half covered engineering considerations and problems that can occur with use including those that lead to catestrophic prop failure. These were enough to panic several listeners especially those with experimentals. To learn about the stresses that your propeller may be experiencing, listen and view the slides of the webinar here. For a new AVweb article on five Suggested Airworthiness Information Bulletins on propeller maintenance from the FAA, click here.