I am looking to buy Cessna 150 or 152. Just recently found two fine planes in good condition. But while I was working on logbooks and pre-buy inspection the planes gone. I didn't pool the time such like months. Two planes were sold out in a days like sunflower seeds in good market day. So my question is - could I expedite buying procedure avoiding pre buy inspection and inspect a plane my self? Is any simple tests what I can make myself? I have to say, I am pretty qualified in mechanical Engineering, have good experience in mechanical electrical electronic works. So I believe simple testing will be available for me. For example, if I ask seller to level the plane in the air and set the RPM on 2620 as required by POH C150. The engine in good condition with good compression has to demonstrate stable flight with speed 98 knots (like POH says, I am not sure in amounts). Will it work? What could I ask the seller to do else for demonstration the plane's condition?