GWS now offers 3-Blade versions of their popular DD series propellers for modelers that need a bit more ground clearance, or for those that want a more scale look on certain aircraft. The GWS 7x3.5x3 prop has a 1/4"center hole pre-molded, and the hub measures 18 mm in diameter and 9 mm thick. The hub is designed to accept a pair of prop adapter spacers that are included with the prop. The included set of adapters allow you to adapt the center hole to fit 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, or 1/4 inch prop shafts. This prop is designed to run in the normal rotation direction, Clockwise as viewed from behind. A reverse rotation version of this prop is available on our site, and a twin-pack containing one of each style is also available. According to the widely accepted Maximum RPM formula of 100,000/D for GWS DD series props, the 7x3.5 DD props should not be used over 14,286 RPM. GWS