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ULPOWER UL260i Aero EngineULPOWER UL260i Aero Engine
ULPOWER UL260i Aero Engine

ULPower Engines II

Formed in 2006, ULPOWER Aero Engines is a small Belgian company which started as a joint venture by a number of individuals and companies. Their intention is to develop and manufacture a light weight aero engine where power and reliability is priority number one.

ULPower engines have been developed specifically for use in light aircraft and are manufactured to the highest standards with fully electronic ignition and multi-point fuel injection (FADEC) system as standard equipment.

Their truly modern engines feature dual electronic ignition (with variable timing), excellent power-to-weight ratio, and high fuel efficiency in a conventional configuration: air-cooled, direct drive, horizontally opposed 4 or 6-cylinder (boxer). Full aerobatic and helicopter configurations are also available from them.

On these pages we are going to describe the different engine model ULPower sells and continue with the larger versions.



Six Cylinder Engines

There are, at this moment, seven different versions of the UL390 and UL520 engine range. In the table below we summarize the most important aspects and specifications compared between each of these models:

Engine ModelUL390iUL390iS / UL390iSA
Displacement3900 cm3 [237.2 in3]
Bore105,6 mm [4.157 in]
Stroke74 mm [2.913 in]
Compression Ratio8.16 : 19.1 : 1
Firing Order1-4-5-2-3-6
Direction of RotationClockwise - cockpit view
Max Torque (ISA)320 Nm [236 ft.lbf] @ 2800 RPM370 Nm [272.9 ft.lb] @ 2800 RPM
Power Rating (ISA)140 hp @ 3300 RPM
130 hp @ 2800 RPM
160 hp @ 3300 RPM
145 hp @ 2800 RPM
Installed Weight100 kg [220.5 lbs]
DC Output50 A
Oil Capacity4 l [1.05 US gal]
Min. Fuel95/98 Octane (AVgas 100LL)98 Octane (AVgas 100LL)
Image

Note: the UL390iSA is the same as the UL390iS but with an adapted oil system to allow inverted flight.

Engine ModelUL520iUL520iS / UL520iSA
Displacement5254 cm3 [213.77 in3]
Bore105,6 mm [4.157 in]
Stroke100 mm [3.937 in]
Compression Ratio8 : 18.7 : 1
Firing Order1-4-5-2-3-6
Direction of RotationClockwise - cockpit view
Max Torque (ISA)425 Nm [313.5 ft.lbf] @ 2600 RPM465 Nm [343 ft.lb] @ 2800 RPM
Power Rating (ISA)180 hp @ 3300 RPM
170 hp @ 2800 RPM
200 hp @ 3300 RPM
180 hp @ 2800 RPM
Installed Weight108 kg [238.1 lbs]
DC Output50 A
Oil Capacity4 l [1.06 US gal]
Min. Fuel95/98 Octane (AVgas 100LL)98 Octane (AVgas 100LL)
Image

Note: the UL520iSA is the same as the UL520iS but with an adapted oil system to allow inverted flight. The UL520iHPS is designed for helicopter and gyrocopter applications.

Text adapted and used with permission of ULpower.

Written by EAI.



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