The fault I found on round 1 with the Skywriter was 3 broken wires inside the aluminium housing. The method Sullivan uses to terminate the wires to the small circuit board makes them break after a relatively short period in operation; maybe 15 flights. Vibration with a 50cc engine isn't helping. I resoldered the wires back in place such that they wouldn't be stressed like they were before. It's totally inop right now. Repair will be a winter project.