N1....N2, Bingo!
I have no turbine time so I am just looking for some simple clarification and explanation. I would like to know what exactly N1 and N2 are.
My understanding of the turbine engines as installed in helicopters is that first the air is compressed and ignited in the first stage of the engine (N1?) and then goes through more turbine wheels (N2?) that are not directly connected to the first stage. And it is these that are connected to the tranny and transfer the energy to the rotors.
Is this anywhere near correct?