[Orv Neisingh]

If you are fling an Exec 90 or earlier Rotorway with a carbureted engine do not use fuel with ethanol. A former student Eric B was flying his Exec 90 on a cross country when the engine lost power and died. He was able to auto into a small clearing with no damage. When we investigated the cause of the engine out we found that the carburetor bowl was filled with a clear gel that lifted the float closing off the fuel flow. The gel was caused by some reaction of the ethanol with moisture/humidity and that combination is not compatible with the carb engines. I try to always use non-ethanol fuel.