I noticed that you opted to place both of the clockwise rotation props on one wing, while placing both of the counterclockwise props on the other wing? I know that the A400 staggers them, with the DBE (Down Between Engines) prop configuration, with each prop, on each wing, rotating inward to the center of the wing. militaryaircraft-airbusds.com/portals/0/Images/Aircraft/A400M/About/22.jpg Have you experimented with different prop configurations, with your existing eight blade CW/CCW props, to see which provides the best performance, stability, speed, maneuverability, etc.? Nice plane. I think you were probably wise to land in the grass, as opposed to the not perfectly level dirt runway, to avoid potential prop damage.