QQ's Yak is a great airplane. You should enjoy it. I'm going to get the 102" myself to play with.

To answer your questions, no there is not a mark on the wing showing the production run. There are also no changes that have been made to the design or production process. There are also no instances of this happening except in the isoluated cases where the mechanics are in quesion, which are very few.


I stand by what I said. Any model with largely oversized surfaces, particularily ailerons, will flutter if not set-up correctly. My analysis based on experience and observation is that the aileron fluttered, the servo gear stripped, ver quickly, and they now unattached aileron went into a very high amplitude flutter which excited the entire wing. The servo gear being stripped supports that as well. Unless you look this in slow motion video, it will look like the wing began to flutter or flap instantly. You'd never see the aileron flutter prior to the servo gear letting go in real time.