Allison 250-C20R_t engine specifications
The Model 250 Series II turbofan engines feature four- to six-stage axial and single-stage centrifugal compressors, a two-stage LP turbine, two-stage HP turbine with a hydromechanical fuel control system, and a gearbox with 3,800rpm output.
Compressed air is routed to the aft end of the engine for combustion, with exhaust gases exiting upward from the middle of the engine.
The C20R engine is based on the proven design of the C20B/J engine. This engine features an advanced compressor with two less stages than the C20B, yet delivers a higher pressure ratio. The engine is available as an option on the Bell Helicopter Textron 206B III and the MD Helicopters MD500E for improved hot/high performance.
Additional improvements include an enhanced power turbine that provides up to a five percent increase in power and a two percent reduction in specific fuel consumption. Gearbox lip-seals and shaft journals have also been improved to help reduce oil consumption. These upgrades decrease the direct operating cost while increasing the value of the helicopters.
These features are incorporated on new production units, or can be retrofitted to existing engines by the Rolls-Royce Model 250 FIRST network of worldwide authorized repair and overhaul centers.
|
|
Use tool to activate engine sound! |
|
|
