Gator RC Flow-Thru Spinner Give your RC airplane a clean, finished appearance while allowing cooling air to reach the power system. The Gator RC Flow-Thru Spinner features a durable molded plastic cone with angled ventilation slots and a lightweight CNC-machined aluminum backplate. The slotted, pitched backplate works with the openings in the spinner cone to direct air through the spinner. This makes it particularly useful for electric-powered aircraft where additional airflow around the motor can help with cooling. Available in six diameters and five colors to fit a wide range of sport, scale, and aerobatic RC airplanes. Features Flow-thru design promotes airflow through the spinner Durable slotted molded-plastic spinner cone CNC-machined aluminum backplate Lightweight design with reduced rotating mass FAI-style aerodynamic profile Pre-cut openings accommodate many commonly used propeller sizes Suitable for electric and compatible fuel-powered RC airplane installations Available in six sizes and five colors Available Sizes and Specifications Spinner Diameter Overall Length Approx. Weight Backplate Center Hole 2" (51 mm) 1.97" (50 mm) 0.71 oz (20 g) 0.246" (6.25 mm) 2.25" (57 mm) 2.05" (52 mm) 0.78 oz (22 g) 0.246" (6.25 mm) 2.5" (63 mm) 2.17" (55 mm) 0.92 oz (26 g) 0.246" (6.25 mm) 2.75" (70 mm) 2.44" (62 mm) 1.31 oz (37 g) 0.315" (8 mm) 3" (75 mm) 2.64" (67 mm) 1.55 oz (44 g) 0.315" (8 mm) 3.25" (82 mm) 2.83" (72 mm) 1.69 oz (48 g) 0.315" (8 mm) Available Colors Black Blue Red White Yellow Selecting the Correct Spinner Choose a spinner diameter that matches the diameter of your airplane’s cowl or nose ring. Confirm that the backplate center hole, overall spinner length, and propeller openings are suitable for your particular motor, engine, propeller, and adapter before installation. Important: Propeller opening requirements vary. Some installations may require careful adjustment of the openings for proper propeller clearance. Check the spinner, propeller, backplate, and mounting hardware for secure fit before every flight. Package includes: One spinner cone with aluminum backplate and associated spinner assembly hardware.