Everllence-linked research connects combustion events directly to shaft and propeller behaviour.

The combustion event does not end inside the cylinder.

Doctoral research by Jacob Ø. H. Rasmussen at the Technical University of Denmark treated the large two-stroke engine and propulsion train as one interconnected dynamic system. The mathematical model was experimentally validated on a full-scale four-cylinder two-stroke engine at Everllence’s Research Centre Copenhagen.

The research incorporates pistons, connecting rods, crankshaft, hydrodynamic main bearings, engine structure, propulsion shafting and propeller. Measured and simulated crankshaft behaviour showed a linear correlation greater than 0.95 across the investigated cases.

Why this matters at the propeller.

A low-speed two-stroke marine engine is directly coupled to its propeller. The propeller does not receive only an average RPM value. It receives the rotational output created by successive combustion events.

Variability in that output can influence instantaneous shaft speed, torsional response, bearing loading, propeller-blade loading, vibration, thrust development and the efficiency with which engine output becomes vessel movement.

What the research does—and does not—show.

The thesis does not evaluate Re4mx or independently verify a quantified saving from conditioned fuel. Its importance is the mechanical architecture it establishes: combustion-generated forces continue through the drivetrain to the propeller. Fuelre4m’s work begins immediately upstream, by conditioning the fuel before injection and combustion.

Fuel compliance remains essential. It does not describe atomisation behaviour, combustion-event repeatability, torque smoothness or useful propulsive work per kilogram of fuel.

The next measurement frontier.

Future performance studies should synchronise fuel injection, cylinder pressure, crankshaft angular velocity, instantaneous shaft torque, torsional response, propeller loading, thrust and vessel advance. That would allow the industry to follow the complete conversion of energy from fuel preparation to useful propulsive work.