3. WHAT TYPE OF ENGINE IS THE DUKE ENGINE
The Duke engine is a four stroke "axial"
reciprocating engine. "Axial" because the
axis of each cylinder is aligned with the
axis of the output/crank shaft. Axial
engines are sometimes called 'barrel' and
'Z-crank' engines. The Barrel shape is a
result of the pistons being spaced evenly
around the central Crankshaft and aligned
parallel to the Crankshaft axis.
4. The cylinder group rotates counter to the
crankshaft, at about 20 percent of crankshaft
rotational speed. The counter-rotating design
allows the engine to partially supresses
torque reaction and cancel vibration.
The five cylinder engine requires only three
fuel injectors and three spark plugs. The
absence of exhaust valves reduces the
potential for pre-ignition or spark knock when
operating on low-octane pump gas.
5.
6. OFFERS COMPLETE FLUE FLEXIBILITY
Development will allow operation on all
appropriate fuels, including
ethanol/methanol and blends, bio-
ethanol, LPG, CNG, hydrogen, kerosene
and diesel. Spark ignition Duke engines
are currently successfully running on 91
octane gasoline and kerosene/jet-A1.
7. ADVANTAGES OF ENGINE
The Duke engine is the world’s only viable
axial, 4 stroke, spark ignited piston engine.
It is lightweight, small, valveless , vibration-
free, has very high power density, and runs
on most fuels, including kerosene/jet fuel.
The Duke engine is a great fit for aerospace
applications, including ultralight,
experimental and UAV platforms.
8. APPLICATIONS
MARINE
The axial arrangement of the duke engine
lends itself well to marine
outboard(vertical shaft) and
inboard(horizontal) applications.
In general, the Duke engine would be best
suited to marine applications with approx
50kW or greater, with the low vibration
providing good performance.
9. LIGHT AIRCRAFT APPLICATIONS
Aerodynamically friendly cylindrical shape,
with output shaft on centre line
Simplicity of design
Low weight
Small size
Near perfect balance for low vibration
