- Oct 9, 2004
- Milan Mich.
- I've designed, built, and flown 4 different ultralight gyros. Amassing parts for a 2 place now.
- Total Flight Time
I agree Chuck that the metal to metal plain bearings are not good, but there has been comparatively few pitch movements on this head and no other failures to my knowledge out in the field. What sets this case apart is the fairly high number of prerotations for its hours, the very high power prerotator, and the severe vibration or juddering as it is engaged, as noted by several people. It looks to me like this happened because the juddering caused very high instantaneous torque loads to the pivot and it fatigued the bolt as a result. I think the DU plain bearing would be a good change, but an increase in the pitch pivot bolt size for the extreme power prerotators, and a cautionary note about excess vibration as well as a suggestion that it would increase longevity to simply pat the blades just a bit to take some of the load off the dead stop prerotation would be in order. What do you think?