Rotax 912
| BRP-Rotax | |
|---|---|
 Rotax 912S in the Polish 3Xtrim 3X55 Trener |
|
| Rotax 912 | |
| Production period: | since 1984 |
| Manufacturer: | BRP-Rotax |
| Working principle: | Otto |
| Motor design: | Boxer engine |
| Drilling: | 79.5 mm |
| Hub: | 61 mm |
| Displacement: | 1211 cm 3 |
| Mixture preparation: | Carburetor |
| Engine charging: | turbocharger |
| Cooling system: | Water cooling |
| Power: | 40 kW |
| Dimensions: | 58.8 kg |
| Previous model: | none |
| Successor: | Rotax 915 iS |
Rotax 912 is a family of internal combustion engines manufactured by the Austrian manufacturer Rotax since the early 1990s . These engines have found widespread use , especially in light , ultralight and powered glider aircraft .
history
Development of the 912 began in 1984 and certification followed five years later. Over time, it developed into the standard UL class motor. By June 2014, 50,000 engines of the 912 family had been delivered.
Description 912/914 series
The Rotax 912 is a with gasoline -powered four-cylinder four-stroke - Boxer engine with bottom camshaft , liquid cooled cylinder heads , air cooled cylinders , hydraulic valve clearance compensation , contactless magnetic-capacitor dual ignition and built-in electric starter .
The engine also has dry sump pressure lubrication and two CD carburettors , a mechanical fuel pump and a propeller gear flanged with an overload clutch , which reduces the speed between the crankshaft and propeller . Due to its design, the engine is not suitable for aerobatics.
It is built in the variants 912 A / F / UL with 59.6 kW (80 PS), 912 S / ULS with 73.5 kW (100 PS) and 914 with 84.5 kW (115 PS), the latter being an engine is a variant with a turbocharger .
The 912 I series has been in production since 2012. This engine is equipped with an Engine Management System (EMS), which ensures optimal electronic ignition and injection. The fuel system is supplied by two redundant electric fuel pumps. The I-Series includes the 912 IS and 912 ISC Sport models.
Technical specifications
| 912 A / F | 912 p | 914 F | 912 ISC Sport | 915 IS / ISC | |
|---|---|---|---|---|---|
| Charging | no | turbocharger | no | turbocharger | |
| Displacement (cm³) | 1211 | 1352 | 1211 | 1352 | 1352 |
| Bore (mm) | 79.5 | 84.0 | 79.5 | 84.0 | 84.0 |
| Stroke (mm) | 61 | ||||
| Compression ratio | 9.0: 1 | 10.5: 1 | 9.0: 1 | 10.8: 1 | |
| Max. Speed (1 / min) | 5,800 | ||||
| Max. Power approx. (KW / PS) | 58.8 / 80 | 73.5 / 100 | 84.6 / 115 | 73.5 / 100 | 104/141 |
| Consumption at starting power (l / h) | 24.0 | 27.0 | 33.0 | 26.1 | 45 |
| Consumption at maximum continuous output (l / h) | 22.6 | 25.0 | 27.2 | 23.6 | 42.8 |
| Consumption at 75% continuous output (l / h) | 16.2 | 18.5 | 20.4 | 16.5 | 27 |
| specific consumption at maximum continuous output (g / kWh) | 285 | 285 | 276 | 250 | 280-310 |
| Mass (kg) | 55.4 | 56.6 | 64 | 63.3 | 84.6 |
| Color of the cylinder head cover | black | green | red | green | blue |
development
The original Rotax 912 was initially developed into the Rotax 914 without any mechanical changes by adding a turbocharger . The naturally aspirated engine concept of the Rotax 912 was further developed into the Rotax 912 S by enlarging the cylinder bore and thus the displacement , without relying on the somewhat more complicated and fault-prone technology of turbocharging be.
On March 8, 2012, the Rotax 912 IS was presented at BRP Powertrain in Gunskirchen, which has a fully electronic, redundant ignition and injection system. According to the manufacturer, this version of the engine has a 20% reduction in fuel consumption with the same output (100 hp), but the disadvantages are an increased weight of around 7 kg, a higher price and a slightly lower maximum torque . The Engine Indication for the cockpit is also a redundant CANaerospace connected -Datenbussystem and provides in addition to the engine data, a plurality of status information of the motor. An engine management unit (EMU 912iS) serves as the cockpit display.
On April 1st, 2014 the new 912 IS Sport was presented. It is a further development of the 912 IS introduced in March 2012 with electronic fuel injection, which is characterized by higher performance and lower fuel consumption.
In July 2015, the Rotax 915 IS was presented at the EAA AirVenture in Oshkosh. Using the large cylinder head of the 912 S in combination with a turbocharger and electronically controlled injection, this represents the logical further development and unification of the existing concepts should. The service ceiling is given as 23,000 ft.
use
Web links
- Manufacturer site
- EASA-TCDS-E.121 (PDF; 55 kB) - Type certification of the Rotax 912
- EASA-TCDS-E.122 (PDF; 200 kB) - Type certification of the Rotax 914
- http://www.flightevolution.com/ - Presentation of the Rotax 912iS
Individual evidence
- ↑ BRP press release (June 2014)
- ↑ Rotax Aircraft Engines: PRODUCT RANGE ( Memento from August 26, 2014 in the Internet Archive ), accessed on August 27, 2014
- ↑ according to the manufacturer's data sheet
- ↑ http://www.fliegermagazin.de/news/detail.php?objectID=9705&class=6
