Hi Big Brother Bear,
In the last half of the 60's, four of us had a combat series going for each summer, kept score the whole season, and the top points guy got a gallon of fuel from the other three at the end of the season. The rules? Goldberg profiles, ONLY, plain bearing 35, 60 foot lines, and 10% fuel. It was amazing how evenly matched the flying was! What a blast we had for several years with those models. They were great flyers.