As the tables are still open I thought I would post these last 3 videos. The original design drawings were posted on another of the model engineering forums and many of them were built. The basic shape was that of a water-cooled type hit and miss engine but without the hit and miss function. Along the line one of the builders created the parts to make his a true hit and miss. I had conversations with him and he sent me some of the extra parts he has made (CNC) I used the flywheel weights but didn't care for the overall design of his lock-out mechanism so I designed my own to more replicate a conventional hit and miss engine.
That is the first video.
I did make some modifications to the design mainly by adding ball bearings to the crankshaft. I also changed the spark plug size and the entry angle as the original plug liked to arc to the valve rocker arm.
The second engine is an extension of the first meaning it uses all the same parts but has an air cooled cylinder.
As an aside, the original engines without governors would run quite fast and therefore would heat up quickly. With the governor set-up the engines will run all day without making much heat at all. This air cooled one barely gets warm to the touch.
The third engine, a vertical, uses some of the basic pieces but with a different base and cylinder arrangement. This also constituted a different fuel tank setup.
The final iteration is a side shaft version of the original. The only original parts were the base, cylinder, flywheels and rod and piston. The head, governor and all other bits and pieces are unique to this engine. For the video I was able to get it to run about it's best. There is a spring on the governor which returns the weight, much like a common governor setup. There is another spring on the speed over-ride lever which will adjust the engine speed while it's running. This spring is minuscule (.008 wire diameter and about .100 long) and is the one element in the whole design that is almost to hard to regulate. I have wound at least 6 different springs with different numbers of coils but with the small size, length constant) it's really hard to get one that totally works.
Enjoy