Rotax 447
| BRP-Rotax | |
|---|---|
| Image does not exist |
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| Rotax 447 | |
| Production period: | unknown |
| Manufacturer: | BRP-Rotax |
| Developing country: |
 Austria
|
| Working principle: | Two-stroke - Otto |
| Motor design: | In-line engine |
| Cylinder: | 2 |
| Drilling: | 67.5 mm |
| Hub: | 61 mm |
| Displacement: | 426.5 cm 3 |
| Compression: | 9.6: 1 (theor.) 6.3: 1 (eff.) |
| Mixture preparation: | Carburetor |
| Engine charging: | - |
| Cooling system: | Air cooling |
| Power: | 29.5 kW |
| Dimensions: | 26.8 kg |
| Previous model: | Rotax 377 |
| Successor: | none |
The Rotax 447 is a two-stroke engine for microlight aircraft . The in-line two-cylinder with 41.6 HP (31 kW) was built by BRP-Rotax GmbH & Co KG in Austria .
construction and development
The Rotax 447 is a further development of the Rotax 377 , in which the output by enlarging the cylinder bore from 62 mm to 67.5 mm and increasing the maximum speed from 6500 to 6800 revolutions per minute from 26 kW (35 HP) to 29, 5 kW (40 PS) has been increased. The current 447 has a single, uninterruptible magnetic high voltage capacitor ignition . The first models were built with a breaker ignition.
The engine has piston-controlled, air-cooled cylinder heads and cylinders . It is cooled either by means of a cooling fan or by the airstream. It receives lubrication from operation with a two-stroke mixture . The Rotax 447 can be equipped with one or two carburetors . The twin version uses Bing Power Systems Type 84 carburetors . The single carburetor version uses the Type 54. A High Altitude Compensation Kit is available as an option.
The speed is reduced by means of the Rotax type B gear for the propeller. The engine has a silenced exhaust system that can be equipped with an additional rear silencer. In the standard version, it is started using a reversing starter . An electric starter is available as an option. An alternator with an output of 170 watts and a voltage of 12 volts is also available as additional equipment. A silencer can also be attached to the air inlet.
The manufacturer refers to the construction-related restrictions with the following warning:
"This engine, by its design, is subject to sudden stoppage. Engine stoppage can result in crash landings, forced landings or no power landings. Such crash landings can lead to serious bodily injury or death ... This is not a certified aircraft engine . It has not received any safety or durability testing, and conforms to no aircraft standards. It is for use in experimental, uncertificated aircraft and vehicles only in which an engine failure will not compromise safety. User assumes all risk of use, and acknowledges by his use that he knows this engine is subject to sudden stoppage ... Never fly the aircraft equipped with this engine at locations, airspeeds, altitudes, or other circumstances from which a successful no-power landing cannot be made, after sudden engine stoppage. Aircraft equipped with this engine must only fly in DAYLIGHT VFR conditions.
“Due to its design, this engine can suddenly fail. A failure can lead to crash landings or emergency landings. Crash landings can result in serious injury or death. This is not a certified aircraft engine. The engine has not been subjected to any safety or endurance tests and does not meet any aviation standards. It is only approved for experimental, non-certified aircraft and vehicles in which an engine failure does not affect safety. The user assumes all liability and confirms by using this motor that sudden failures can occur. Aircraft equipped with this engine may not be flown in areas, speeds, altitudes or other conditions where a safe landing without an engine is not possible after a sudden engine failure. Aircraft with this engine may only be flown under VFR conditions during the day. "
Versions
- 447 UL-1V
- Equipped with a carburetor, output 39.6 HP (29 kW) at 6800 revolutions per minute
- 447 UL-2V
- Equipped with two carburetors, output 41.6 HP (31 kW) at 6800 revolutions per minute
Technical specifications
| Parameter | value |
|---|---|
| power | 30 kW (41 hp) at 6800 rpm |
| drilling | 67.5 mm |
| Hub | 61 mm |
| Displacement | 426.5 cc |
| compression | 9.6: 1 |
| Weight (without gear) |
26.8 kg |
| Fuel consumption | 11 liters per hour |
