Well, Novaflier, with the exception of the Sig spinner I mentioned, I've had good luck with plastic spinners on four strokes, in all sizes. I'm running a Goldberg right now on a Laser 150. This same spinner and Graupner prop ran fine on a Saito 150 for many flights.

The other two shots are Dubro spinners on a 52 and 70 Surpass. That Four Star has a PILE of flights on it, and the yellow one on the 70 on the Matrix was on a YS 91 for 18 months.

Perhaps the fact that I don't use a starter has something to do with it?