Estes Big Yank clone Simple mini engine design. This was one of my first clones when I returned to the hobby. Perfect for dusting off my long dormant rocket building skills. BTW I cleaned up the decal scan on the JimZ site, it prints on white decal paper with red or blue background. Edit the background colors or change your paint to match colors, and trim around the decals. Built this before I knew about home printed decals. Laters.