Good Idea race. I will first try to duplicate on the ground by pointing the nose up and transitioning through all throttle settings. Hopefully it will die. Next step I guess is to make sure there is no debris in the carbeuretor jets. If that looks good then I will go ahead and get the cline regulator. After talking to Gerard interprises, in am now 90% sure that will alleviate my problems assuming there is nothing partially blocking the fuel system. I will also use larger diameter tubing. I think the reason it didn't quit when flying on an upline versus in a hover (same orientation) is because when I was on the uplines the throttle was higher...creating more muffler pressure. However, in the hover the throttle setting was much less... resulting in insufficient muffler pressure and without the aid of the fuel pressure, there just wasn't enough fuel delivery.

Greg