Hischier also reported, "The spiral stability of C4 is good and its directional stability is good." While noting that engine operating temperatures were acceptable he acknowledged that further work may be necessary for operations in the hottest climates. "But don't change a thing aerodynamically," Hischier enthused! Engine temperatures will be remedied primarily with cowl changes focused on cooling, yet Flight Design is pleased with the Continental IO-360-AF engine that performed very well.

"Flight Design engineers can work on reducing some friction in the controls," Hischier noted, "but leave the rest alone." Most prototype airplanes go through refinements after the initial flight verifications even while most of the group working to achieve the first flight were pleased that the new airplane performed so well. We observed the C4 accelerate away from the C-172 chase plane during simulated approaches to landing and in simulated go-arounds," commented Peghiny, observing from the Cessna.

"I could also see that during the 30 degree bank turns the test pilot needed no control correction and he reported that pitch forces were light," added Peghiny. "The plane appeared to be on rails, it looked very stable. Damian said he was comfortable getting close to us for the photos and videos shot during the maiden flight." On board avionics are supplied by Garmin with the G3X Touch augmented with TSO analog instruments. Garmin has become a vital partner to Flight Design as C4 moves forward.