The Cox Babe Bee is perfect for small R/C, control line or free flight airplanes. Includes our Snap Starter spring starting feature that makes starting easy without the need for an electric starter. The attached fuel tank also functions as the motor mount easily attaching to your firewall. For safety, the needle valve is mounted at the very back of the engine keeping your fingers clear of the prop. Required Propeller: 6 x 3. Required Fuel: 20% to 30% nitro content. (Often called 1/2A fuel). Note: the Babe Bee does not include a throttle and runs at full speed until the fuel runs out