These kits all make the same basic, engine, but at different
sizes and different price points.
This is an approximately 500 piece kit. It is cut from 1/4" plywood instead of 1/8" plywood, this builds a approximately 33 inch in diameter 7 cylinder radial engine with moving pistons and valves. Much bigger and more impressive than the "standard" sized one, but takes about eight times as long for me to make.
This engine kit is the same as our standard kit, but has had some issues in manufacturing. Some of the fins may be broken, or some of the laser cutting may not be complete. If you are good with a scroll saw and glue, you can still make an engine out of this kit. These cannot be backordered, and are only available occasionally. ...