Grumpy got airborne using the Doolittle technique I posted about here. During the takeoff, there were some puffs of smoke from one of the engines. Initially I thought this might just be some oil blowing through but, as they climbed out, the output from the engine was clearly not as it should be and the one engine was clearly not healthy. They cut short the flight (although not as short as it could have been) and brought the plane back down. I saw Grumpy fly a few weeks later so I guess they dealt with whatever the issue was.