Gee Bee trim
Hi-
We found the KMP Gee Bee balances perfect with a 120FS (ASP/Magnum/OS) with a 1500mah rx pack under the tank and 150grams of additional lead weight as far forward as possible. These engines weigh approx. 850-900 grams, so the perfect engine for the R2 120-size would be just about 1kg - 1000 grams. A big twin or radial would impair the models excellent flying qualities!