we had this type of racing five or six years ago and it was a blast. it came about as a fill in for our club racing program . the combat racer guys wanted an organised format to compete when they where not combating.
I used a Zigg's Corsair with a thinned wing and a cut down turtle deck to make an FG-2 with a K-B .21 had race times of 1:40's

our rules where any combat airplane was allowed at that time there was no 2610 but it sure was a blast.