OLLIE....You bring up an important question about CG.....The answers are probably numerous but certain criteria remain factual.....and needed......from my experience many modelers are not all that familiar with the basic aerodynamics of flight...matter of fact..(I'm an Aircraft Mechanic at an Airline).....I see a number of Mechanics as well as some Pilots that have forgotten or weren't interested in that info....In my earlier years spent time with many Large radial engined planes ...DC-6, Connie ,etc..and helped with W/B computation, fueling etc....and CG better be right....now I work on on some Airbus ..A-320 series and all fly-by-wire and automated beyond comprehension...concieveably could make everyone lazy.....but because of Airbuses Stability Augmentation(they use smaller tail vert/horiz surfaces )CG really better be right.....I fly Large WWII planes and with the high wing loading and less Flt surface travel distances W/B computation is "Crucial"....as compared with the Aerobatic flyers where light wing loading and miles of flt surface and travels give a huge CG window....so my advice is....when doing W/B...Get it right...it just might keep a model from returning back into "kit" form....Bill...