Hey guys! Terrible problem happened in South America. I also posted this in alta 6 sectiom not sure which is a more appropriate sub category for this... But i know lots of people in this forum would be interested in this and I am in need of some oversight. If a moderator would advise and move to where he or she thinks this post belongs. This is very important to me and I believe that alot of the heavy lift professional operators who log many hours on their frames will be intrigued by this discussion also. Recently repowered our gryphon dynamics 1100mm x8 v2.0 frame originally with tmotor u7 kv490 and tmotor 80amp escs with tmotor 18in props. We repowered two weeks ago to KDE 5215-435 with 95amp kfe escs and 18in KDE folding props. Logged 4 hours of test flights after passing bench tests, everything passed with flying colors. Low ESC temps etc compared to tmotor only 90 degrees Fahrenheit after operation at auw of 47lbs. Before with u7 we would see 165 degrees Fahrenheit. Long flight times little voltage drop. Didn't seem as if there were any high frequency vibrations. Anyway here comes the sad part.... During flight, I heard a loud audible plastic impact while hovering over water. Before i could return to inspect, 3 seconds later I heard another pladtix impact and the rear arm dropped like a rock. Drone movi m15 red dragon and Zeiss lens RT motion follow focus system fell into heavy heavy surf. Unrecoverable.... At first I thought it could be a failure in the folding prop that canabalized the other prop. However, after speaking with Patrick at KDE he believes that the Gryphon Dynamics motor mounts are not strong enough for the braking and acceleration of the KDE motors. (They spin over 11,000 rpms.) They claim that the motor mount could have been sheared off during flight or the motor mount screws. This seems plausible to me, however during construction everything was carefully torqued and thread locked. I have heard some sketchy things about flex etc on gryphon dynamics frames. These coaxial motor mounts were over two years old and had seen 250+ hours of operation. Has anyone else logged this sort of time on the gryphon frame? Has anyone else experienced this sort of mechanical failure. Trying to determine cause of failure to help our industry and my future build. Scared of using gryphon parts again... they look great their functionality has always been fantastic. Just little things, like play in arms, low amperage 3.5mm bullet conmectors and other things that have always bothered me about their quality control. This also makes me wonder about their standards for testing and being transparent about failure points amd recommended maintenance over time. Because that's what's important for a professional logging hours on a frame. They want to trust it. I have no problems replacing things at a regular interval. Thanks boys! It's these kind of things that haunt our dreams hahahaha. But we are still early in the industry. Its aviation anyway.... Looks like we are buying the Alta 8 until we find a new frame and flight controller for super heavy lift drone. Looking forward to synapse and closed system flight control if there's any positive to take from this loss.