New engine
Jim,
Mine is 25% of original CG, no added weight. Flew very well, because I moved the tank to the CG and of course the new CG changes taking reference from the original CG (Check the review of the GP Patty Extra 300 S on the Great Planes Website). This means, with 25% on mine with the tank on the CG is not the same at yours on 25% with the tank in front.