The magnum motors went fine inverted and the Saito motors are still in the aircraft. The TT 54 FS just didn't want to to the job, they both failed for some reason or another. We are happy with the Saitos and will leave them in there. The TT motors are reliable either straight up or at 90 degrees but didn't like being up side down. Good luck with your plane I hope you get a lot of flying pleasure out of it.