PW 125B Turboprop engines.
Hi all.
Just started a new type course, the F50. In the powerplant chapter, I learnt that the Powershaft and HP spool rotate clockwise and that the LP spool rotates counterclockwise (as seen from behind looking in the direction of flight).
It's not that I'm not accepting this, I am, but I'm just curious, are there any other engines operating in this way? That is, having the different spools rotating in different directions? I've never heard of it and can think of a lot of reasons for why this configuration is a bad thing (different directions of precession forces etc... Then again, someone with a much bigger salary has thought that one out for me...). Just curious.
/LnS