One of my students who has over two thousand PPG flights, and flies the heck out of his Minari 180cc motor had a surprise in flight yesterday over the waters of the Long Island south shore. All ended well but not for the motor. After a nice one hour flight at about 1000’ AGL, he felt something strange with the engine when accelerating. The RPM were going up really quickly when throttling and the sound was not the same. He turned the motor OFF and glided back to his tiny post stamp-like LZ at the shoreline. Upon inspection after touchdown, he realized what had happened. We can only speculate but in light of what the motor looks like, the fracture crack was likely due to excessive vibrations after a few parts came loose and fell off. Washer, clips, propeller, the re-drive pulleys, etc… which are now at the bottom of the bay. He tried to at least find the carbon fiber propeller but no luck. A new engine block is needed. I hope for him that Minari will help.
What it should look like:
What it looked like after landing: