Ed
They were Ramtec fans. I bought the jet from a guy in 1996 who had converted it from a single to a twin. He had made his own fuel cells from pop bottles and had 90 degree rotating main retracts. The wings have double aluminum spars and the fuse has been reinforced with a couple of ply formers but everything else is stock Byron. I managed to do some high speed taxi tests before I decided to convert it to turbine. That will necessitate a rebuild of the horizontal stab area and a reinstall of the servos for elevator and rudders. Still have a lot of work to do.

Roy