my Fantom- built in 1980- was a attempt at making a .049 powered racer - It weighed 12 ounces all up and had two servos mixed to elevons. 200sq inches. not a good racer --
stability was really pretty good and at speed would do a half as sed roll at full elevon deflection
the airfoil - just a high point for structural.
now (ta da) I am going to stick a small electric motor and some lipos in it and try it again - I can beat original weight and power as airframe total was 8 ounces with the original TEE DEE /batts n servos/rx .