May 20, 201313 yr ata-cid='2673058' name='kevinh' timestamp='1368886211' post='2673058'] Actually that only applies to the smaller pt6 series....the pwc100 series are all triple spool turboprops: low pressure spool (nl) high pressure spool (nh) and the free spool (connected to the propeller) From my experience the single shaft turboprops respond quickly while the free turbines respond slower...I've never flown a jet but from riding jumpseat on CAL's 737s the cfms respond to throttle imputs much faster compared than when i'm flying a kingair (the garrets on the mu2s are near instantaneous) I didn't mean to exclude three shaft turboprops, I meant to show they could have at least the same number of shafts as turbofans. Surely all engines, whether turbofan or turboprop, have to meet the same response time criteria to be certified? All other things being equal the lower inertia of the much smaller free turbine turboprops ought to be quicker to respond than a large turbofan. If it isn't then the fuel control system is reducing the response rate for some good reason. Interesting as it is, we are well off topic. The engine response rate is not relevant to autoland certification, or not, of turboprops.
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