Go-vertical, I think the 38 would do well on the Gee Bee. As for the Christian Eagle a guy at our field has one and it has a Brisson 3.2 I think he said. It flew very well. I would use at least a 50 on it. You can get a Sears saw (Poulan) over 50 cc. 55 I think it is and pretty reasonable. There was one at my local store that was returned and it was $99.99. Looked almost new. Check your Sears stores out and see if they have a returned merchandise area. Home-Depot here has the same area. Echo saws there for the most part.

Tim