not diving into the discussion itself. just a technical details.
DATCOM would not have produced accurate data for any of these 5th gen fighter, it works for a regular tube and wing airplane somewhat. in low-mid mach regime, that's about it.
J-20... The New Generation Fighter III
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not diving into the discussion itself. just a technical details.
DATCOM would not have produced accurate data for any of these 5th gen fighter, it works for a regular tube and wing airplane somewhat. in low-mid mach regime, that's about it.
Well someone run F-22 through an AVL or DATCOM then. I want to see what the results say.
Bigger picture of J-20's vortices:
out comes a bunch of aero derivatives and cl/cd curves that don;t make any sense?
sure, but what a waste of time.
all these fighters, not just 5th gen, but even for something like a F-18, would have some highly non-linear aero effects. why bother if you don;t have a windtunnel.
I meant using them as a counter example.
Quickie
Colonel
Bigger picture of J-20's vortices:
Look at the canards! Whoever said the J-20 is nose-heavy. Can you please raise your hand?
counter to what?
nose heavy or not,
there is no way one can tell from a picture in flight.
to say something is "nose heavy" means your cg is much fwd of your Cp or something like.
that picture capture a moment in time, which the aircraft may or may not be trimmed. the control surface may be down ward deflected to counter act a nose pitching moment for all we know.
I really dislike people base their "expert" aerodynamics opinions on a picture or two.
G
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No normally vortices are not what gives control surfaces their ability to control airflow.
they do it by generating lift on that particular surface thus generating pitching moment.
vortex helps by energize the flow over lifting surfaces at high angle of attack so that other wise detached flows would still attach on the control surface.
Quickie
Colonel
Not just a picture or two. Most of us have watched the recent videos of the J-20 doing the maneuvers and there're lots of other earlier pictures/videos showing the J-20 landing or taking off, with the position of the canards and canted tails clearly visible, proving that the J-20 is not nose-heavy. The conclusion was based off these observation thus far. But some did "base their expert aerodynamics opinions on a picture or two" (using your own words) and said the J-20 is nose-heavy and therefore too unbalanced for good design sake.
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