ULPower UL260i: 97HP Aero Engine

UL260i: Performance

Power / Torque curve

The power and torque curve of the engine has been established by repeated dyno tests on our second prototype, which were performed at sea level and in weather conditions close to the ISA standard. The following graph shows the real, available power and torque coming from the crankshaft of the UL260i engine corrected to the International Standard Atmosphere conditions at sea level.

Power vs MAP and RPM

The following graph shows the power the UL260i engine produces at a given manifold pressure (MAP) running at a particular rpm. When taking your MAP reading and corresponding RPM at cruising speed, the graph gives you a good idea of how much (little) power your aircraft actually needs in flight.

Power vs Density Altitude

The following graph shows the calculated available power of the UL260i engine at different RPM settings, WOT (wide open throttle) and varying density altitude.

For more information on ISA, density altitude, interpretation of this graph, the conversion of the figures to actual atmospheric conditions, refer to the "Engine Resources" section on our website and more specifically: "ISA conditions & conversion".

Alternator performance

The following graph shows the electrical current the alternator can deliver at various RPM. The red area is the maximum current needed to run the ECU and a single ignition system. Adding the red, brown and green area gives the total current needed to operate the engine with a double ignition. The yellow area is the net current available from the alternator to operate other electrical aircraft systems and charge the battery.