Engine play day

I had several hour of free time this afternoon. I had several things I "had" to do. But, I came to the conclusion that it was far more important to play with some engines than it was to do house work. The first engine to capture my attention was an OS FS-20 that just arrived from an e-bay seller. After a little cleaning and oiling it was loose enough to run. so, I put it in the mount and got it going. Wow, it was fairly easy to start and adjust. After ten or so minutes of running time I decided on an MAS 9x4 prop. It was purring right along at 11,500 RPM with a beautifully low idle and smooth transition. Next up were two Saitos that I don't have an engine mount for but still needed some attention. Both had been sitting for over ten years. They are a .65 and a 1.25. They both got a nice external cleaning and very thorough oiling. They both still turn over smoothly and have great compression. I hope to get them both flying in the next few years. The final engine was used for a diesel experiment I wanted to try. It was a new AP .061. I installed a Cox diesel head but I used the head gasket, a teflon disc then an aluminum disc I made from a soda can. It worked great. What I was trying to accomplish was to have the easy adjustability of the Cox head without having the teflon disc always blowing. I got just what I was hoping for. After about an ounce of fuel was run through the engine it was peaking at 11,000 RPM and idling between 4000 and 4300 RPM with a smooth transition. This was with Davis 1/2a diesel fuel and a Cox grey 7x3.5 prop.