I had worked part time for Chris Machin (Progress Manufacturing making Rev-Up props) back in the '70's, and he spent a considerable amount of time on the phone talking to other old time manufacturers like Axelrod (Top Flite), Goldberg, and K&B (Brodbeck). His Rev-Up line of props was started in 1949.

The Mig-27 drone foam airframe was made by Goldberg models, powered by K&B, propped by Rev-Up. It was known as the FQM-117 target drone. In this photo the prop has the classic Rev-Up shape, and the K&b .65