MM21 - The Ross-Drive engine
| Technical details | ||
| Year of construction | 2002 | |
| Power piston | stroke | 14 mm |
| diameter | 12 mm | |
| Displacer piston | stroke | 14 mm |
| diameter | 19,5 mm | |
| Flywheel | diameter | 64 mm |
| material | PMMA | |
| Idle speed | 600 rpm | |
| Energy source | alcohol | |
| Mass | 300 g | |
Description:
This engine was made after the pattern of MM05, but smaller by a third. By
using accordingly smaller DURAN test tubes and matching sectional aluminium as
well as PMMA for the chassis it was possible to build a small transparent and
smoothly running engine, of which I made two, one being sold at Ebay.