@ersakthivel,
Can you please tell me what kind of stability do F-16s after Blk-30 have, RSS or Negative or Positive. You answer it correctly and you will never again post this shit about RSS again.
1.Explain what do you mean by thrust line in your own words and , and how is it's relationship works with center of lift ,which keeps moving places in subsonic and supersonic flights,
2.And also since the center of gravity of the fighter changes with depletion of fuel, depletion of external stores like fuel in drop tanks , inside the fighter and bombs and missiles ejected,Since Cg changes with all those activities , how do you propose to keep the center of lift or thrust line just below the CG all time.
3. And also explain how this CG change can be counter acted by lower thrust line of F-16 XL without RSS ,while both the center of lift and Center of gravity keeps changing?How can you keep CL just below CG all the time in all flight profiles?
4. As you say turn rate is determined by just bank angle and speeds and it has no relation with RSS, I completely accept it.
5.But My point is to achieve this bank angle quickly and keep it up all the time with least force couple based momentum resistance of Cg (which pulls the plane down because gravity is acting on it and a downward couple is generated, since it is no RSS design)the figter has no other way other than having RSS.
6.RSS planes have their Cg behind Cl in sub sonic and near trans sonic flight at their corner velocity. That is the reason F-16 has better STR than F-15 irrespective of F-15 being much bigger and having two powerful engines.The F-15 is not an RSS plane means it's center of lift is behind CG in corner velocity, unlike the Eurofighter TYPHOON.
What this means is during cornering at around 300 +knots it's Cg being in front of the Cl produces a downward force couple all the time. That is the reason Why F-15 despite being a much bigger twin engined plane is unable to achieve high STR of F-16 A.Remember both the F-15 and F-16 belong to the same low wing area , high wing loading concept.
It has been embarasingly proved many times in USAF exercise that F-16 is more agile than F-15. But since F-15 is a much bigger load carrying heavier long range interceptor with much high standards of BVRs and RADAR and electronic counter measures it's position as premier fighter was unchallenged. But this doesnot mean that it's non-RSS airframe design is superior to F-16's RSS airframe.
But still F-16 excels with high STR of 23 + degree at corner speeds and F-15 lags behind with poor 15 to 17 deg STR in corner speeds means F-16 is RSS and F-15 is the old conventional stable flight profile with positive static stability meaning the airframe resists the attempts of the pilot to maneuver and tries to stay level, which is not the case with RSS F-16 which goes with the pilot's effort to maneuver , because it is RSS based negative static stability platform.
also there is a small matter called force couple, which get generated by the distance between the CG and CL. Cg tries to pull the plane down with nose down momentum, Cl tries to lift the plane up. IF both are at the same exact place , no force couple arise.
But it is impossible to keep it that way all the time as the fighter maneuvers all the time and changes to super sonic and subsonic flight all the time resulting in changes in CL and with the reduction of fuel and external stores it's Cg too changes place. How do you propose to keep both of them at the same place with thrust line or CL just below the Cg all the time?
In RSS aerodynamic layout this force couple actually benefits the fighter, because the CG which tries to pull down the plane due to gravity is below the Cl which pushes the plane up. A force couple is generated that results in the nose pitch up momentum of the airframe. That is why it is described in all articles that describe the tejas's aerodynamic loadout that it has a tendency to pitch up the nose.
It is this nose pitch up momentum which results in achieving Gs faster and reaching it's higher AOA limit faster. Coupled with the fabulous wing loading of Tejas it results in attaining a high ITR pulling GS faster and getting a firing solution with HMDS enabled high of bore sight WVR missiles in close combat.
Through out the Sustained turn this force couple between the CL which is infront and Cg which is in the back acts on the airframe making it sustain the Bank angle or AOA at it's top limit with no opposition and little effort. But for non RSS fighter the it is exactly the opposite , that is the CL in the back and the CG in the front creates a negative force couple resisting the aerodynamic lift work done by the wings to achieve high ITR and high AOA along with high STR,
This is the reason RAFALE and TYPHOON have both high ITR and STR than the F-15 irrespective of the TWR.
You are welcome to contradict and put your explanations against the points I have made here.
As I believe every one learns something from a lively debate conducted with proper decorum,
instead of each throwing challenges to other guy on the dance floor, like those in the teenage Hollywood fast dance movies,
I nether hate to be proved wrong. In fact I look forward to it.Since I learn nothing by saying what comes to my mind, but i will learn a lot if someone else point out my mistakes to me.Since I have no claims of being a top dog aerodynamic expert , I lose nothing in being proved wrong.
Thanks.
So feel free to contradict me,
