Hello All,

Does anyone know where I can get polypropylene sheet for hub hinge material, from a local source. (central Florida)(is that what a coffee can lid is maid out of)??????? Is there a better cyclic loading flexible material then polypropylene? For those who have tried this material what thickness would you use for a .40 sized gyro? I was thinking about .030” to .040” I’m using www.autogyro.com for help on a lot of the design. My gyro has all ready flown successfully how ever the flapping hinge hub is not that I built was not that great. I could use Hal’s design from the RCM gyro 5 but It would require an Aircraft Spruce order ($$ shipping & a long wait) for aircraft piano hinge.

SG