hi dave i found a 18cc homelite all ready converted with spiner and prop shaft and mounts the person said it spines at 11,700 rpm with a 16x6 prop total wt 3.5 lbs he also said it pulled his 13lb lanier stinger 120 around just fine if its true i think it you be just fine for a spad to the bone corocub wingspan 76" lenght 47" wt 6.75 lb rated engine 40-60 what do you think iam new to gassers