Donatello
RETIRED TTA
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The RD93 upgrade is on offer for sure, since it would be based on the RD33 MK upgrade, but the key for the JF 17 is, that developing this varient will cost money and the Russians are not going to fund it, they don't even buy more Migs with such an engine anymore and there is only JF17 that would require a single engine varient (Mig 29K, Mig 35, J31 would all use the normal MK version). So would PAF fund upgrades of the RD93 engine, or wait for a suitable Chinese engine till it's reliable and powerful enough, to safe costs?
Also the comparison to the GE 414G btw is a bit more difficult, since the thrust increase for the Gripen is far bigger:
RD33-3/RD93 - 49,4kN dry / RD 33MK - 52,8kN dry => 7%
RD33-3/RD93 - 84,4kN wet / RD 33MK - 90kN wet => 6,7%
RM12 - 55kn dry / GE414G - 62,3kn dry => 13%
RM12 - 80,5kn wet / GE414G - 98kn dry => 21,8%
Even if the RD-93MA would have 93kN wet thrust, that would only be an increase of roughly 10,2% and even less for the dry thrust, so would an upgrade really get JF 17 that much compared to WS13?
Any amount of thrust increase with minimal fuel consumption increase, would be welcome. So whether it's 5% increase or 20%, it helps. However, i believe PAF wants WS-13 as it would mean total independence from Russian suppliers.
Fighter aircraft engines are very different to, say, civilian turbo fans. On a civilian airliner engine, you have the luxury of expanding the fan size. As in the case of GE90 series, you can have engine with fan diameter of 123 in (GE90-94b) with 416KN thrust to the 128 in version (GE90-115b) with 514KN thrust.The extra diameter is accommodated easily as the engines are held by the wings.
In case of JF-17, you cannot expand the engine size without modifying the already smaller fuselage. Which means, the improvements in thrust have to come by other means.
The issue is not of engine thrust. We watched excellent (Actually surprising) maneuverability of JF-17 at the recent Dubai Airshow. What really matters is the weapons package, and the on board electronics capable enough to deal with that.
Modern warfare doesn't care if you have high thrust or not. Okay, it matters a bit, but modern BVRs homing in above Mach 2.0 and turning at above 20Gs, good luck try running from them.