Terry has made the patterns and cast
most of the pieces for his engine
A double simple engine expands the steam
once but has two cylinders. These engines are powerful and start from any
position but use more steam than a compound engine.
A compound engine has two or more
cylinders, the steam first entering the high pressure cylinder then
exhausting into one or more larger cylinders. They are generally more
economical than simple engines.
A single cylinder steam engine will not
start if it has stopped at top or bottom centre and may need a "kick" on a
flywheel to start it.
