So far there are none for the little glow engines, there are some new .15cc people are using in 60 size to 90 size planes. A 1.20 glow is 20cc, I have a 1.40 gasser that is 22cc, a 30cc is a 1.80 and afterr that I have to start doing that math stuff. I haven't seen a chart published yet but I have seen people do the math and chart it for there own hobby shops just for fun. As much fun as the little gassers are I don't go gas until after 120 glow. I know others that have been. I am old school and figured an 80 inch wing on a stunt plane called for a 40cc gas engine b ut that was after flying some big planes with the Zinoah 23cc. I have the old RC Showcase 1.40 or 22cc gasser but it is very high performance and I bought it years ago to test on different types of planes. It handles most any 1/4 scale stunt plane and I have it waiting for my next kit build, the Ultra Sport 1000 with an 80 inch span, That little engine turned out great for that type and size of plane.