RR Tyne Turboprop Questions
The Tyne appears to be unique in being a 2-spool, shared (fixed) power turbine type, and I’m after some info on the way this engine is/was operated.
Normally – for a single spool or single/multi-spool + free-power turbine engine - I understand that the Power Lever controls torque, and the Condition/Prop Lever (if present) would set the propeller speed (and also perform other functions such as feather and fuel shutoff)
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Now, I gather that the Tyne is slightly different as the Power Lever primarily sets the prop speed but also dictates fuel (i.e. torque) via an interconnect characteristic – this being needed to get an acceptable LPC working line for a given LPC/prop speed. The Condition Lever is used to modify the interconnect characteristic (e.g. reduce fuel at a speed) which has the effect of fining pitch.
Tyne drivers please:
a) have I got this right?
b) what are the quadrant detents?
c) what is the normal speed range?
d) what defines end of beta range,? flight-idle detent?
Any other snippets of info very welcome.
Thanks.