ok i agreed for half NICIS you haves an F-4 u 1/4scale... but if you use then for the first you must balance against the model ok?..... yes i sure if you going an contest to win hands low because 'a 14 or a 18 cyl are not so common to be able to judge what is the best ... and certainly a 18cyl compared to a 7 and how to compare a 5cyl petrol engine with a nitro to ...(i like to much the radial engine but when this is not so much cip).......... then obvious that this is my thought, and that others have their ...