Dave,
Yes, I did leave out part of the designation for the little GE motor in the earlier post. Thanks for the correction.
Didn't the R.R. T 56/ Allison 501/ AE-2100 /AE-3007 (without the propeller gearbox) receive a "gong" the other week for its longevity and reliability?
For a powerplant first produced in 1954, with a production run of 18,000 units and over 200 million flight hours recorded, surely there is scope for further refinement using FADEC, etc?
Not to mention the new GE 38 powerplant derivative under development from its original application in the CH 53K (Super Stallion military helicopter).