Just a test. Very primitive "combustion" engine. You have to time the power strokes yourself by firing the gun. I'm trying to come up with a way to implement automatic timing.
Specifications
General Characteristics
- Created On Windows
 - Wingspan 18.0ft (5.5m)
 - Length 30.3ft (9.2m)
 - Height 20.9ft (6.4m)
 - Empty Weight 3,987lbs (1,808kg)
 - Loaded Weight 4,298lbs (1,949kg)
 
Performance
- Wing Loading 159.7lbs/ft2 (780.0kg/m2)
 - Wing Area 26.9ft2 (2.5m2)
 - Drag Points 6843
 
Parts
- Number of Parts 45
 - Control Surfaces 0
 - Performance Cost 229
 
          
              
              
              
                  
                  
                
technically it's a "combustion" engine
@rexzion Yes thats possible, as long as the shells are not explosive
How about this?
maybe you could use a cannon attached to the piston head?
This is awesome love it
Nice. Actually a really impressive concept when built into a actual engine
weird but why not