J-XY - maybe J-35 - next generation carrier-borne fighter
- Thread starter Deino
- Start date
SAC failed the 5th generation fighter aircraft biding competition to the CAC in late 2000s. Then it decided to develop a new 5th gen stealth fighter aircraft by itself.
But, if it designed another heavy fighter aircraft like J-20, there would be almost no chance for the new aircraft to be accepted by the PLAAF.
And also, at that time WS-10 was not yet entering batch production, the only available engine for a heavy aircraft was AL-31, which was needed by both J-10s and J-20s.
Therefore SAC would more probably lose the competition for the engine supply if they designed a self-developed fighter requiring AL-31s.
So SAC designed an medium aircraft with two RD-33/93 engines, aimed the international 5th gen medium fighter aircraft market. This was the origin of FC-31 and why it wasn't equipped with larger AL-31/WS-10 engine.
FYI a single WS-10C could do the same thing as well (or B, with even lower performance)…
Yes… But no, you would end up designing a new aircraft. The fuselage would be have to be drastically redesigned - which would affect other aerodynamic properties, which will require further redesign (e.g. wings and vertical stabilisers). By the time you are done, you would have a whole new fighter on your hands.
I forgot to add another enterprising presumption: the WS-19 engine has ONLY 60% fuel consumption rate of the RD-93 engine.
Thanks for all the explanations. Appreciate it.
I don't think that would be possible.
In civilian world, a generational leap normally results in 15% fuel consumption improvement and that normally requires increasing the bypass ratio (check the GTF engine for A321NEO vs the VK-2500 for A321CEO). Let's say RD-93 was really bad for its generation and WS-19 is pretty good for its generation. Even so, I would say a 25% bump in T/W ratio (from 8t to 10t) + 20% gain in fuel consumption would be monumental improvement. Decreasing by 40% is quite unlikely unless WS-19 suddenly became a high bypass engine.
both are different category engines. WS-10 is large and high thrust engine. WS-19 is medium thrust engine.
you need to understand one thing, high thrust is not everything in engine. durability , reliability , T/W ratio , advance materials and life hours are the most essential parts. WS-19 is the product of latest Chinese breakthroughs in materials and Metallurgy. and the better engine than any WS-10 variant except WS-10C. can super cruise , better fuel consumption.
I see.
But If I presume the new WS-13+/WS-19's fuel consumption rate being 85% of RD-93 and the overall operation fuel consumption rate at average 80% of full thrust(without afterburner) fuel consumption rate, then we could calculate the total fuel needed for a 2.5 hours flight operation to be:
75(kg/kNfh) * 50kNf / 1000 *0.85 * 0.8 * 2 * 2.5h = 12.75t (per 2.5h flight).
This result of calculation denied J-XY being an EW 12.5t, MTOW 25t and combat range 1000km fighter, which requires the aircraft to fly more than one hour to reach the battle field, stay/fight/patrol for 20 minutes and then return to the carrier.
Let's suppose the aircraft having 600km combat range, which requires it to fly 40 mins to the battle ground and fight for 20 mins and fly back. Then it's 1.66h flight. The fuel consumption would be:
75(kg/kNfh) * 50kNf / 1000 *0.85 * 0.8 * 2 * 1.67h = 8.52t (per 1.67h flight).
This fuel consumption would leave an acceptable 4 tons payload, about 3 tons ammunitions after 1t reserved 15 min fuel.
Also we could calculate the available ammunition capacity when the combat range set to 800km:
75(kg/kNfh) * 50kNf / 1000 *0.85 * 0.8 * 2 * 2h = 10.2t (per 2h flight).
There is about 1.3t ammunition payload capacity left considering the 1t/15min reserved fuel.
Hard to feel optimistic for the range of a medium twin engine fighter.
There is an AVIC reference for some of the specifications for FC-31 V2 from zhuhai a few years back.
(Yes, use the left column in Chinese given the right side used a machine translation, no need to point it out everytime)
I'm unsure if the real aircraft would have been fully rated for this performance, but I suspect the J-XY/35 probably would not be far.
(Yes, use the left column in Chinese given the right side used a machine translation, no need to point it out everytime)
I'm unsure if the real aircraft would have been fully rated for this performance, but I suspect the J-XY/35 probably would not be far.
It's not that big of a deal, they can be buddy refueled by J-15s equipped with drop tanks acting as ad hoc tankers or a dedicated stealth tanker.