Effective combat range with effective weapon load will depend upon the criteria called fuel fraction, i.e weight of internal fuel/empty operational weight of the fighter.
In this area even tejas mk1 better than gripen C.
Then a question arises why range of tejas was often quoted less, it may be due to the reason that new super sonic center line fuel tank was not validated till IOC-2, Even without that The press information beruau release clearly stated that the combat range of tejas is 500 Km. It means a combat range in excess of 1000 Km in a low penetration fuel consuming flight into enemy territory, with extra fuel allocation for take off, a few minutes of high fuel consuming close combat and high fuel consuming After burner thrust .
But other fighter makers give misleading combat range figures with minimum weapon config and high altitude(less fuel consuming flight path) with no allocation for close combat and AB thrust and low penetration mode.
Roughly the fuel fraction above will give us effective combat utilization of the fighter.
Su-30MK: 34.9%(Empty weight: 17,700 kg,Internal fuel: 9,500 kg)
Rafale: 31.4% ~ 33.6%(Empty weight: 9,500 ~ 10,220 kg,Internal fuel: 4,680 ~ 4,800 kg)
JAS-39NG: 30.6%(Empty weight: 7,100 kg,Internal fuel: 3,130 kg)
MIG-35: 28.6%(Empty weight: 12,000 kg,Internal fuel: 4,800 kg)
Tejas: 27.0%(Empty weight: 6,500 kg,Internal fuel: 2,400 kg)
JF-17: 26.3%(Empty weight: 6,450 kg,Internal fuel: 2,300 kg)
JAS-39C: 25.0%(Empty weight: 6,800 kg,Internal fuel: 2,268 kg)
This is a fair comparison of fuel fractions with just internal fuel , and the same percentage will more or less reflect with external fuels also,
So Tejas mk-1(which still has 400 KG of flight test equipment on board, removal of them will lead to even better fuel fraction) itself has much better fuel fractions than grippen C/D with more TW ratio and lower wing loading,
Tejas mk-2 will easily compare to RAFALE which has just 4 percent more in fuel fractions than Tejas mk-1.
So in indian conditions there won't be no issues with range of tejas mk-1 or mk-2 in useful combat configuration if we take into account that four tejas can be operated for one RAFALE if we include total lifecycle costs and upgrade costs,
So there is no way Tejas can be faulted on weapon load or range. A full read of the link above will show how fighter makers abroad indulge in word play when it comes to range and load figures!!! , to fool the people.
Also indian hot atmospheric conditions sap close to 10 percent of engine thrust and 12 percent of wing lift.
So most of the fancy , combat specs ,pay load and range figure mentioned in the glossy brochure wont be achieved in indian climatic conditions.
All tejas specs are for indian hot climate, but other fighter maker's specs are for IDSA temp which is far less than indian atmospheric temp.
Close coupled canards are discarded in all fighters from latest fighters from Russia(SU-35) and F-35, F-22 from US, because of RCS concerns arising from latest gen ASEA radars,
the cranked delta of tejas also does the same job done by canards i.e vortex creation o delay flow separation.
And LEVCONS(like in PAKFA) can do the job of canards without giving extra radar reflection like canards.
canards also have may tricky control issues like force coupling and pilot induced oscillation which restrict the efficiency of wing.
And there are many types of canard arrangements like close coupled on rafale and long momentum arm like typhoon , each of them having their own tricky control issues.
canards were considered on F-35 and later dropped.
Even for the evolution of F-16 ino F-16 XL its designers chose cranked delta like tejas , with concerns over RCS emissions from canards. Also in canard arrangements canards are designed to stall before the main wing, so the main wing never achieves its full efficiency.
There are already some videos on the net with two gripen pilots facing the pilot induced oscilation problem peculiar to canards and let the plane crash unable to recover from it.
Eventhough later it was claimed that this problem was resolved, we don't know how it was done or whether any flight envelope restrictions were added because of this.
That is the reason why US and Russian fighter designs always rejected canards in their latest 5th gen fighters and are employing compound delta with levcons(same arrangement proposed for tejas mk2).
The Chinese J-20 was a copy of the rejected mig 1.44 delta canard stealth version(in favour of LEVCON , compound delta in pakfa exactly present in tejas mk2).
So redesigning tejas with canards will be an extremely job throwing its induction into jeopardy.
Also the reason cited by ADA for not including canards was,
1.it will add 3 feet to fuselage length,
2,It will add more weight .
3.During wind tunnel testing for the small airframe design of tejas , it did not give any considerable performance enhancement for the above two penalties it imposed.
It is pertinent to note that gripen C which had canards is 300 Kg more in empty weight in tejas and 3 feet longer in length.
In indian hot atmospheric condition which already saps 12 percent engine thrut and lift this added weight and drag will make tejas further underpowered.
Also in a quest to make gripen E more of an MMRCA new fairings were added to it further increasing drag and now it weighs more than 7 tons in empty weight.
But the path chosen for tejas mk2 is very simple. Add 0.5 meter in fuselage to smoothen the cross section increase between 4 and 5 meter lengths in fuselage and retain the same design and go for further weight reduction by increasing the percentage of composites to more than 50 percent.
It will make teja mk2 far more effective and developmental path would be very short and less complex with no time over run
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For my above comments, This was his reply,
I am not technically proficient in these matters, but I have, I think, good intuition on most matters technological and strategic, and can grasp the basics fast. Should have mentioned the Levcons built into the navalized variant of Tejas as the most suitable Mk-2- AMCA option. Regret not doing so. But thank you for response(s) on this and other issues re: Tejas/MMRCA on earlier occasions. Between the contributions to this blog by you and @RV, have learned an awful lot about combat aircraft architecture and technologies — as no doubt have the other readers of this blog. Thanks again!