I have just put a brand new set of blades on to do a quick check flight before venturing out onto the Yorkshire Moors. After literally 5 minutes flight time just checking gps compass etc closed down to put it back in it’s hard case. This is what I found on 2 of the props. No I didn’t fly into anything and it looks more like delamination on one of the props. They are stored off the bird in a recess in the case. Looks like will be getting Master Screw as replacements...heard they are harder wearing. These are OEM as well!!