dynamite dean,
I would exercise great caution in relating any of your performance numbers to other "Full Fan" aircraft (e.g. B747), at RAS 197 at F/L 490 and Mach Number of M0.799, you would have a very substantial ram recovery factor for your aircraft, which has a centrifugal compressor.
The ram recovery factot at M0.799 for an engine with a centrifugal compressor stage would be very significant indeed.
Regards,
Old Smokey