High-power fliers - please be aware of this advisory from AeroTech regarding the J450 and K535 Dark Matter DMS motors. Some J450DM motors in lot number 092818 and K535DM motors in lots 092418 and 101718 used cases that were wound at the incorrect angle and are thus more likely to fail. If you have one of these motors, please look at the attached document for details about how to determine whether you have a faulty one.