Powerplant

Question 1

Model and SHP EX

Answer 1

PT6A-140

867 SHP

Question 2

Model and SHP Legacy

Answer 2

PT6A-114A

675 SHP

Question 3

Engine Description

Answer 3

PT6 Reverse Free Flow Turbine. Compressor Turbine and Power Turbine are not connected

Air enters in to the engine through the intake on the left side of the engine cowling. It then goes past the inertial seperator (Bypass position ; air turns 90 degrees and heavier objects proceed out the bypass door) into the 3 stage axial compressor (Compresses air horizontally “axial” effiecient at lower RPM) through the single stage centtrifugal compressor (7:1 compression ratio) into the annualar can which reverses the direction of airflow. 2 igniters light the mixture and sends it through the gas generator (101.6% is 38,100 and 100% 37,500) some of the combustion exits throught the exhaust and the rest through the power turbine (33,000RPM) to the gear reduction box which uses a sun gear to reduce the speed to 1900RPM

Question 4

Engine Compression Ratio

Answer 4

7:1

Question 5

Number of Axial Stages

Answer 5

3

Question 6

Number of Centrifugal Stages

Answer 6

1

Question 7

Power Turbine RPM

Answer 7

33,000

Question 8

Gas Generator RPM

Answer 8

37,500