The first number is the diameter of the prop in inches. The second number is the pitch, or twist, of the propeller. I f your airplane kit is not equipped with an engine mount, perhaps the simplest solution to mounting is a Great Planes Adjustable Engine Mount . Many engine manufacturers also offer mounts that are custom-made for their engines. Though they offer some aerodynamic benefits, they're primarily cosmetic.
Spinners are available in white, black, and some colors, as well as with a polished aluminum finish.
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