Rear Wings

[choppo]

I posted on Dunc's thread, but might be better in it's own.. Mod's feel free to delete my post on the other thread... Any aero engineers looking on please post!!!!

1stly, out of interest Dunc, is there anyway you can get a log of wing attack angle vs. speed on your car?? What is the max/min angle it goes??

2ndly - (help needed by tech nuts here)... for the purpose of my question, say Dunc's wing was at a fixed angle..... now, what happens if you get the 'two vertical side bits' (LOL cant remember the name of the buggers) and taper them IN toward the rear. So the shape of the wing gets narrower as it progresses to the rear? i.e. generally follows the shape of a rounded rear end car and goes from a long rectangle to a long trapezium. The air will obviously speed up, but is that good/bad/ruins the entire wing???? I can't see it being too flash as all wings would be like that on all V8SC... technical input much appreciated!

[ghz28]

Hi Chop,

nowhere near being an aero engineer but basic theory of a wing/aerfoil is that lift is created at the surface with the higher air speed. An aircraft wing has a higher camber on the top surface, so the air has to flow a greater distance, hence at higher speed, than the lower surface.

The end plates, act as gates/winglets to prevent/reduce air falling off the end of the wing thus increasing lift developed for the physical length.

Turn all that upside down for a downforce wing on a car.

Reasoning on the above, my guess is that accelerating the air through rear gates would either reduce downforce due to reduced pressure, or as air is compressible, simply force the air boundary layer to increase in thickness through that area.

gh

[seldo]

2ndly - (help needed by tech nuts here)... for the purpose of my question, say Dunc's wing was at a fixed angle..... now, what happens if you get the 'two vertical side bits' (LOL cant remember the name of the buggers) and taper them IN toward the rear. So the shape of the wing gets narrower as it progresses to the rear? i.e. generally follows the shape of a rounded rear end car and goes from a long rectangle to a long trapezium. The air will obviously speed up, but is that good/bad/ruins the entire wing???? I can't see it being too flash as all wings would be like that on all V8SC... technical input much appreciated! Chop - Whilst I certainly don't profess to be an aero expert, I think you'll find that the end-plates are there to reduce reduce tip-vortices. The pressure difference from top to bottom surfaces causes the air to spill over the ends of the wing to the low-pressure side and this creates a spiralling vortex which trails from the ends and causes drag. To find out more just Google "tip-vortex"

[lautray]

The pressure difference from top to bottom surfaces causes the air to spill over the ends of the wing to the low-pressure side and this creates a spiralling vortex which trails from the ends and causes drag. To find out more just Google "tip-vortex"

This is called induced drag. It is a by-product of generating lift (downforce). Induced drag increases as you increase angle of attack; decreases as airspeed increases (inversely proportional to the square of speed). Considered a "slow speed" drag.

[Profi]

Chop, more to consider then angle of attacks, each aerofoil will react differently to different angle of attacks. With a good shape high downforce (single element) aerofoil i have seen around 15 degrees of attack without it stalling.

Best thing would be to get a pic of the profile.

[JJR355]

Profi,
Are you still selling that VT/X rear wing?

[Profi]

Decided to keep it for now.