RE: Fly Boy 50 ?
Very nice looking plane. Looks like a good stepping stone towards warbirds with the tappered yet eliptical wing... Much like a Spitfire or a P-40. However a 6 Lbs. it should be a fairly sporty pattern trainer. Sorry though I have no inside info on it for you. Probably another Chinese made ARF that you will have to reinforce all the joints on.
EDIT// To make this a warbird trainer simply fly it as is and as you get used to it add weight untill you get to 7 ish pounds and do not over power it.