The UL390iSA is basically an UL390iS engine.
A modified engine casing, oil sump and oil pick up system, designed by our very own ULPower team, and an additional inverted oil system allows the ULPower engines to fly inverted:
This inverted oil system copes with potential greasing issues. The oil pick-up tube in the oil sump is mounted with a hinge joint. While climbing or diving up to an angle of 90°, the oil pump can pick up the oil from the sump without any problem.
The oil inverted valve can change the pick-up direction while climbing or inverted flying, this means that the oil is coming from the top of the engine casing (which is now the lowest point). The large (but light) “oil air breather” prevents the oil from leaving the engine.
The fuel injection system (instead of carburetor) prevents the engine from stopping or losing fuel when flying inverted.
IMPORTANT REMARK: modification in your fuel tank is needed to prevent engine from sucking air.
Oil capacity: Oil sump must be filled with at least 5 liter oil. (1.32 US gal)
| Displacement | 3900 cc |
|---|---|
| Bore | 105.6 mm |
| Stroke | 74 mm |
| Compression Ratio | 9.1 : 1 |
| Firing Order | 1 - 4 - 5 - 2 -3 - 6 |
| Direction of Rotation | Clockwise - Pilot's view |
| Maximum Torque (ISA conditions) |
370 Nm (273 ft.lb) @ 2800 rpm |
| Power rating (ISA conditions) |
160 hp @ 3300 rpm / 145 hp @ 2800 rpm |
| Installed weight | Installed weight:103,2 kg (including starter motor and alternator) |
| DC output | 50 A |
| Oil capacity | Min 4,5 L |
| Fuel | MOGAS with min. 97 RON / 88 MON (= 93 AKI) octane rating or AVGAS |
The power and torque curve of the engine has been established by repeated dyno tests, 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 UL390iSA engine corrected to the International Standard Atmosphere conditions at sea level.
The following graph shows the calculated available power of the UL390iSA engine at different RPM settings, WOT (wide open throttle) and varying density altitude.
| Dimension | Weight |
|---|---|
| Maximum dimension in X direction (length)* | 723 mm [28.4 inch] |
| Maximum dimension in Y direction (width)* | 654 mm [28.97 inch] |
| Maximum dimension in Z direction (height)* | 472 mm [18.58 inch] |
For more details please check the technical data document.
These are values at full throttle. When cruising estimated average is UL390 ±21l.
(depending on type of plane, personal style of flying, cruise speed , climate circumstances)
The following is a list of the ULPower engine standard design features, all included at no additional cost.
Please contact us for more info / prices
Note: Pictures may not always represent the exact colour or shape.
All prices indicated are excluding taxes and transportation costs.
Deliveries to private individuals within the European Union are subject to 21% Belgian VAT. Prices subject to change without notice.
