I had my maiden flight today using the NGH 38GF engine on my GP Super Sportster. The engine ran very well and flew the plane just fine. However, three of the four engine mounting bolts were loose after a seven minute flight. I hate to give up on this engine because it does run well but still has much to much vibration. I will play with it a bit longer and may try the nylon mounts rather than the stand offs but I am afraid it will follow the same path of my Saito 180 which I sold to others because I could not solve the vibration issue.
Best wishes and good safe flying.
Heli-NuBee (AKA Roger the radial rabbit)