The shaft on the motor looks really hard to find a proper adapter. The shaft is 4 mm but the hub on the Graupner prop is 8 mm. So you need to get a prop adapter that will fit on a 4 mm shaft with a 8 mm shaft for the propeller. You probably have to cut the shaft on the motor so the prop adapter won't be so high. If you have a machine shop near by I will just get the shaft changed.