Is anyone going to claim that there is zero fretting of the doubler ribs on the leading edge of the blade? Or on the contact surfaces in the center?
On this point, AG owners are welcome to post photos of their blade inspections. I suspect that as 300+ hours are accumulated, the fretting will be obvious to see.
The 6 retention bolts are drilled straight through the large center blade hole.
Where else but the outer bolt hole can the racing of molecules focus?
The blade is bending there, and apparently more there than at the lateral end of the doubler.
An internal "hinge" is being created in the blade itself. It will just take longer in the RS2 vs. RS1.
Please carefully inspect your AutoGyro blades. I'd use a jeweler's loupe with a bright flashlight.
Safe flying,
Kolibri
26 APRIL 2019 REPLY TO THE BELOW ____________
Sorry, Phil, but I could not glean exactly what you meant by that.
____________
Yes, Alan, I agree.
Uh, well, if the gyro were descending through the trees . . . upside down.
But if the blade was still attached upon reaching the trees, then what made the gyro descend catastrophically at all?
No, I think it still makes more sense that the blade hit the tail at altitude, and was torn off at altitude.
Yes, it could suggest that.
It doesn't look that way to me.
Rather, it strongly indicates stress from rapid coning and flattening forces, not solely from centrifugal forces.
The tear is at an angle from top to bottom: from the center topside of the last bolt hole towards the bottom of the blade.
The stress riser was exactly in the same place as the RS1 blade cracks: