Hello,
just to add our technical help on the point.
We do produce folding carbon fiber propellers for Inspire 1 and 2 from long before TMotor entered this particular market niche.
Our design for the
Inspire 2 contemplates the use of nylon locknut embedded in the lower hub, but the most important part is the retaining spring washer on the top, just under the head of the screw.
That seemingly trivial part is the key in the joint, as it keeps a lot of constant force in the assembly, embedding itself into the contact surfaces (7075 aluminium hub and 10.8 steel screw), preventing any turning action not deliberatlely applied to the screw with a proper hex key.
In about three years of production, not a single customer had the propellers detach from the central hub, nor suffering functional structural damage in the carbon fiber.
Cosmetic scratches can happen, but they do not cause performance or safety issues; we do usually send replacements anyways.
We had a dozen reporting a collision with birds or crash into rocks, but in every case the folding props absorbed the impact and the rigidity of the carbon fiber permitted to the drone to come back home safely under its own flight ability.
We need to specify that our propellers are 100% carbon fiber, whereas competitor's one are resin infusion with some carbon layers added for strength.
Here attached are some detailed pictures of the aforementioned spring washer, and the others reinforcements embedded into the carbon fiber.
View attachment 22337View attachment 22338View attachment 22339View attachment 22340View attachment 22341View attachment 22342View attachment 22343
We hope this post didn't sound too much like advertising, but we felt there were some technical aspects to clarify.
Best regards,
HeliEngadin