I have the Kieve or hot prop on my 912 uls and had to buy a new set of blades. The foam came loose inside one of the blades and was pressing against the tip about 2 inches in. I could feel and see the bubble. We cut the tip off and sure enough the foam had come loose and a chunk was causing the bulge. I have close to 500 hrs on the prop and live here in hilo hawaii. Plane is always under a roof with good ventilation but hawaii is humid. Don't know it this was the cause of the foam breaking loose or not.
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