for the special advance
-it can be very late brake as its friction distribution close to nature stable
-it can hard brake & turn but the front wheel won't lock up since it brake by rear, so it can transfer more load to front wheel to help turn near to the limited of tyre
To maximise braking performance of any vehicle all four wheels need to be just on the right side of locking up... any less and you are simply not using the tyres to their full potential... the delta lay-out is no different to a normal car in this respect... Any talk of "only braknig" on the rear tyres just means the braking performance is compromised.
-it can accelerate very early, stable & fast since a look like Drag car layout
Agreed. More weight over the driven wheels is good for low speed acceleration where a normal car would be traction limited. But dragsters aren't generally a good thing for race tracks as the last 100 years of automotive "natural selection" have shown. When Porsche developed the GT1 from its 911 what did they do? They took the rear-drive layout -(a layout originally developed for the VW beetle to maximise interior space), and they moved the engine forward to improve its on-track performance potential...
and when we compare it to 口 car
-you can't really lighter then Deltawing when there's are no rule & you 2 using same material & strengh are then same too, because DW a really losing a big part on front of the car.
I think the difference is much lower than you think... for example, if you were to space the front wheels out on longer suspension, and place those wheels in their own aerodynamic enclosures and make the nose correspondingly slimmer, I don't think there would much difference in weight, don't you think? I have in mind something like this:-
& 口 car get more upper side area, it generate more lift force, it also making drag & neutralize some down force.
I disagree: Taking things a bit simply; if you take a wing and place it in ground effect it generates say "X"N of downforce... take the same wing and make it twice as wide and you have twice the area... so the downforce is "2.X" N -there's none of this "neutralising down force".... (although the drag is also twice as much if we neglect end-spillage effects). I believe a wider wing (representing the wider floor area that is possible with a rectangular car) is actually more efficient for a given level of downforce.. look at Gliders -their wings are wide and slender (The exact opposite of the Delta wing shape; long and narrow)....
I would love to see someone do some basic CFD studies to nail this one on the head once and for all....