I don't know if this Boeing C-17 GlobeMaster III is the biggest RC aeroplane model in the world, but comparing it to the now-dead previous record holder it looks like we almost may have a tie. In any case, its six metres of wingspan, four turbine engines, and perfect detail make it a worthy competitor for the Top Gun competition. Check the stills to get an idea of this model's majesty.
The original C-17 is 53m, has a wingspan of 51.75m, and can carry 102 troops, a payload of 170,900 lb (77,519 kg) of cargo "distributed at max over 18 463L master pallets or a mix of palletised cargo and vehicles." Its remote-controlled counterpart is made at a 1/10 scale. According to its creators, the model weights 120kg.