Category: Modelling
Four-stroke engine "Hans
The model
The "Hans" engine, the construction of which is briefly described here, is available as a casting kit from Thorsten Schür, including a set of drawings. It is a four-stroke engine with snifting valve, only the exhaust valve is controlled.
Procedure
Step 1
Fitting the flywheel
Figure 1 shows the cast aluminium parts set and the flywheels. As this is a five-spoke wheel, it cannot simply be clamped in the three-jaw chuck. A metal ring with a diameter of approx. 100 mm is clamped in the three-jaw chuck with internal clamping and then the flywheel is mounted on it (Fig. 2). See also report, "Machines in modelling" 3/14.
Step 2
Milling the base
The next step was to mill the base flat.
Step 3
Unscrew the cylinder holder
I then unscrewed the cylinder holder.
Step 4
Milling the pipe clamps for the tank
The next step was to mill the pipe clamps for the tank.
Step 5
Turn the piston
Precision is required when turning the piston. The groove for the piston rings is being made here.
Step 6
Build the crankshaft
If you are afraid of building the crankshaft, you can also have it made by Thorsten Schür.
Step 7
Manufacturing the cylinder head
The cylinder, including honing, can also be made by Thorsten Schür.
I modified the cylinder head by making it from solid aluminium. The ignition is a traditional contact breaker ignition. I described how I got the Hans running in "Maschinen im Modellbau", issue 3/15. Aspen2 has proved to be the best fuel.
"Dampffreunde Friedrichshafen" are modelling enthusiasts who are interested in making technical models - steam engines, hot air engines, combustion engines and tractors are just some of their interests.
Further information can be found on the Dampffreunde Friedrichshafen website.
Tip
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