Tony, I'm having some difficulty trying to understand the need for additional modifications to your Onas as a result of your change to the Contra Drive unit. I was led to believe the Contra Drive would all but eliminate the inherent problems associated with spiral slip stream we all have to contend with on all standard inrunner and outrunner motor installations. Is part of the problem based on the current design (built-in right hand thrust) of most, if not all, 2m pattern planes that are available today? If this is the case than I have second thoughts about making the change. I hesitate because it seems somewhat counter productive if many more changes to my planes are needed as a result of changing out the gearbox on my Neu F3A motors. Perhaps it would be best to have a 2m plane designed to accomodate the Contra Drive unit. I would appreciate your response and encourage Brenner to give his thoughts as it relates to my concerns. Thanks in advance and wish you continued success this year__Everette