this here is my big sig kavalier. wingspan 82 inches. making it light so I can use a 40 size motor and 4 cell battery. have 5 cell batteries too just in case. im actually going to try to use an sk 4240 turnigy motor, being the weight miser that I am. would be super light then. 5 lbs easy if not 4. have to see if a 13x8 prop will work, if not ill swap motors and use 15x8 prop. i like sigs red white and blue covering scheme, so I tried to copy that.
i have a smaller kavalier at 36 inch wing span that flies very nice. so what the heck. scale it up for big bird club fly ins.
im hoping it will go vertical reasonalby well and then spiral straight down. thats pretty much the only trick I know.