thanx pedro.. i rechecked it was 5 1/4" took it out yesterday... took off and needed 2clicks of dwn elev. to re-trim it.. so that improved the inverted flight. gonna move the battery jst a smidge more ... and she should be great .. mabe 5 3/8's i put it on the scale and it's 7.1 lbs rtf, seems kinda heavy for that size plane but flys good ... i know it was under 7lbs when i first started fly'n it but, put on a alum spinner and special mount for the muffler on the saito (kept comming loose) so i think thats what put me over the 7lbs mark.. got 114 flights on it so far so good...thanx tim