Originally Posted By: mjoekingz28
Yes, but a jet spins like a turbocharger-unlike a reciprocating piston.
Cujet- I am assuming turbojets can spin higher rpms than a turbofan, but what is a ballpark rpm?
Does altitude change this number?
The big difference being the piston/ring/cylinder situation. Gas turbine engines have gears, bearings and drives that need robust lubrication.
The main gas producer section of the turbine engines on our helicopter often spins over 50,000 RPM, 100% = 54,117. And, yes, it spins far faster at altitude than at sea level. Might be 94% at sea level.
The power turbine runs at a fixed speed, 44,038 RPM, directly geared to the rotor system, which is always at 100% (385 RPM)
So that thin BP2380 oil takes a high RPM engine and lubricates it and all of the parts necessary to reduce it to very high torque, very high load (all flight loads) conditions.
Interestingly, the engine output shaft is 6000 RPM, and the starter/generator RPM is 12,334.
Oil pressure hovers above 60PSI and can go over 200PSI on cold starts.