Back in the '50s and '60s, the British firm KeilKraft offered a whole range of plastic spinners of that design - I've still got some of them in 1/4" steps from 1 1/4" to 2", and they were all right(ish) for small engines up to 3.5cc. They were popular because they were cheap, and the only trouble was that the screw-on nose cone sometimes flew off when the engine cut - especially annoying if you were flying over grass!