I built two Skyrays for grandkids. I made wider elevator- 1 3/16 inches, belcrank 60 mm spacing and 15 mm shoulder, modified nose to fit the intake of the .049 , two pennies in the “weight box”, no landing gear. The blue Skyray is powered by .049, weight is 6.34 oz dry, 34 ft Dacron lines. C/G is 20% with empty tank. Model flies most of the PA routine. The yellow Skyray is powered with Big Mig .061 Norvel with RC carburetor open full bore. C/G is 10%, weight is 7.44 oz dry. It flies fast, and I will get dizzy. Both models built identical, engines and tanks can be swapped.
Jerry