Peter, Forgive me if I asked this question before. I looked in old messages, but didn't see it. In the past 2 years I talked to different Skyboy owners and they all confirmed to me that this airplane flies completely different with passenger vs solo. Best way to describe is to say, that with passenger airplane feels overloaded. You need much more nose up trim. Trim is not sensitive anymore. You can move trim lever back and forth by 1/2 inch and feel very small gradual changes in climb or descent. Otherwise flying solo aircraft would respond immediately with up or down by 500 ft/min. In addition ailerons with passenger becoming very lazy and wiggling your wings will turn in to slow motions. I call it flying cow. One time I was flying C-172 with 200 lb over-gross and 160 HP with very similar feel in controls. I was told by some engineers that this kind of behavior is direct result of under sized horizontal tail. Wondering what do you think. Thank you! Peter Garrison 12:46 AM (1 hour ago) to me Eugene, The lack of trim effectiveness would be expected if the horizontal stabilizer were already operating near its maximum ability with two aboard. Do you have any photos of the empennage in flight while carrying two people? Is the 2-person loading the most forward CG case? It would then be the most statically stable, meaning that stick forces would become heavier. There would be some diminution in roll response because the moment of inertia about the longitudinal axis would be greater, but I'm surprised that the effect would be as large as you describe. Peter, This picture was taken with 200 lb lead ballast on passenger seat, at 85 MPH, CG at about 23% MAC, stabilizer at about negative 8° AOA and elevator at 10-11° AOA. This aircraft was certified in Germany with CG limits 21% - 36.6% MAC. This is same CG range as Aeronca Champ with same NACA 4412 wing and you feel very little difference between solo flight and with passenger. Aeronca empty about 100 lb heavier and same cruise speed with 85 HP engine. My Skyboy has 100 HP engine. I remember during our first flight with LSA instructor right after takeoff he decided to abort our lesson. On downwind he was telling me that something is wrong with this airplane and he not comfortable flying with me and checking me out in it. To prove his point he was moving stick left and right with 6" spread, but aircraft was flying straight and didn't respond. Only later after talking to different Skyboy owners I found that this behavior is normal for all Skyboys and we start flying again. Thank you!