Tank 540 ml for petrol Tank 540 ml, petrol-resistant including the requested accessories for installation in a Benzin-Trainer or in a petrol mechanics. The CofG of a model helicopter should only be checked with an empty fuel tank. During the flight the fuel is situated in a place where the additional weight does not have an adverse effect. If you set the CofG with a full fuel tank the resultant reduction in fuel during the flight would be disadvantageous to the models position of center of gravity, Size: 70 x 70 x 127 mm, overall length inc top approx 134 mm