I’m not seeing the 3 pipes... I am much more familiar with gas turbines and not jet engines, so I went looking for some info. I did find this nice YouTube video explaining the engine.roon wrote: ↑26 Sep 2018, 01:38Still wonder why there's three pipes connecting the airbox to the shroud around the compressor. The outer two pipes are smaller than the center pipe. Thoughts? Might say cooling, BOV, or even a dual entry two-sided impeller. Think: one pipe to the front side as normal, and two pipes leading to the rear half. Triple entry, two-sided impeller.
http://www.youtube.com/watch?v=ulY_dw0Hui4
The pipe coming from the front is the starter air.