Racing car aerodynamic optimization
Racing car aerodynamic optimization
(OP)
Hi All,
some suggestions for aerodynamic optimization?
for more downforce and reduce drag


http://vunebenzinu.cz/images/aktuality_2013_C/i.jp...
https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-...
thanks for ideas
Radek
some suggestions for aerodynamic optimization?
for more downforce and reduce drag


http://vunebenzinu.cz/images/aktuality_2013_C/i.jp...
https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-...
thanks for ideas
Radek





RE: Racing car aerodynamic optimization
Oh you don't want to do that, well, you need to tell us what your limitations are.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Racing car aerodynamic optimization
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
like greg says, how do your class rules limit things ?
Quando Omni Flunkus Moritati
RE: Racing car aerodynamic optimization
Greg Locock - I certainly do not narrower tires !!!
I have not any class rules limitations
MikeHalloran - what exactly do you mean ?"fairing over each pair of tubes supporting the rear wing"
closed profile support?
rb1957- rear Wing is two element with gurney flap,
undertray is flat aluminum plate begins under transmission and ends under the rear axle axis
Radek
RE: Racing car aerodynamic optimization
So, fold a pizza box in half, slap it over both tubes, and staple the loose ends behind the tubes, so you end up with a sorta streamlined 'pant' over the two tubes.
At least put a streamline sleeve over each tube.
Also, the plate that attaches the tubes to the wing and the flap; that's aero-ugly, and probably bigger than it needs to be structurally.
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
I understand now
RE: Racing car aerodynamic optimization
Also, the secondary airfoil is not strictly a Gurney flap.
http://en.wikipedia.org/wiki/Gurney_flap
It might be more effective as a downforce device if moved up a little so it's out of the primary foil's boundary layer but still in the pressurized area.
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
is the undertray vibrating any ? i hear that F1 gains alot in the careful management of the airflow under the car.
how about a 3rd rear wing element ?
Quando Omni Flunkus Moritati
RE: Racing car aerodynamic optimization
Quando Omni Flunkus Moritati
RE: Racing car aerodynamic optimization
I do not understand
Here small gurney flap:
RE: Racing car aerodynamic optimization
hood fwd edge ... again, your first pic shows the fwd edge of the hood, doesn't look smoothly faired into the front panel (in front of the radiator).
i understand two elements in the rear wing ... why not three ? (like F1)
Quando Omni Flunkus Moritati
RE: Racing car aerodynamic optimization
yes,
probable vibration is seen at the first image
(undertray bend before the rear wheel)
is a replaceable curtain for reducing pressure under the hood (entry restrictions cooler)
look what hood does (lift) without curtain
https://scontent-b-vie.xx.fbcdn.net/hphotos-ash4/9...
RE: Racing car aerodynamic optimization
But how do you reach more downforce on the front end for aerodynymic balance?
Thanks for Your any more ideas
RE: Racing car aerodynamic optimization
Jack up the after end of the hood, like the car told you it wants, or just truncate the after end, leaving a big slot for the air to get out.
Maybe you can take it far enough to turn the hood into a huge front wing.
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
You can to specify?
just to make sure that I understand correctly.
RE: Racing car aerodynamic optimization
Think of it this way: If you ignore the presence of the engine and the radiator, the space between the front wheels would make a decent aero tunnel, with a wing mounted upside down at the top where the hood is, and a clean air passage from the radiator intake going back and then up to the base of the windshield. Now just mentally put the engine and radiator back in place, and figure out the tinwork to maintain the airflow under the hood/wing. Probably easier with a Subaru as the substrate.
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
I understand now -this good idea ( hood rear end helping engine air evacuation)
also me interested aero elements used for japanese silhouette car(pictures)
as strips on the sides of the windshield or rear panels behind the rear wheels
that can work well
http://www.speedhunters.com/wp-content/uploads/200...
http://www.speedhunters.com/wp-content/uploads/200...
RE: Racing car aerodynamic optimization
The strips at the windshield corners I'm not sure about. If there's a gap under them, they would tend to direct some of the pressurized air stacked up in front of the windshield around the A pillar in a relatively orderly manner, just as some station wagons are equipped with anti-spoilers(?) that direct the roof boundary layer down over the rear window.
... for different reasons, I think.
If there's no gap under them, I haven't a clue.
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
panels probably restricting flow from the side into that low pressure area (diffuser effect substitute)
The strips at the windshield If you do not have the space could increase the pressure in windshield
RE: Racing car aerodynamic optimization
RE: Racing car aerodynamic optimization
If you can, place the wing even higher, add some almost ground rubbing side skirts, a rear diffuser with flat underbody panels elsewhere.
Use taller wind end plates, BTW remove the wing mounts you have and make the end plates the attachment points.
Make some ducts so radiator hot air will exit from either over the hood or behind the rear wheels or both.
Drill some holes or install some louvers so air from the wheel wells will vent up to the hood.
Make it a fastback by moving the rear window further backward and filling the remaining space with either sheetmetal or a 4th window when looking it from the side.
If there are no rules for aero create a vacuum cleaner Chaparral 2J like car
http://en.wikipedia.org/wiki/Chaparral_Cars#2J
Doing so you'll get insane downforce even when standing still
A so equipped Corvette won a Road&Track skidpad challenge
http://www.readabstracts.com/Automobiles/Road-and-...
http://www.vcmc.ca/forum/showthread.php?8789-Road-...
Be bold
RE: Racing car aerodynamic optimization
I would like to use big end plate at front wing(splitter)
RE: Racing car aerodynamic optimization
RE: Racing car aerodynamic optimization
I am thinking using side plate (attached picture) with minimal added of weight
what your opinion?
RE: Racing car aerodynamic optimization
RE: Racing car aerodynamic optimization
Are there any restriction on using other car model? This one will need quite a bit of tinkering!
1. Re-profile curves over the tyres, if tyres cannot be narrower. Front tyre curve seems notorious to me -drag wise!
2. Strip out the rain-stopper strip above the windows. If you are racing, you dont need them!
3. Two front holes, if they are head lights, bring them in forward - in line with the other surfaces. Else fill them or make them thru to tyres, if you have information that ventilation is beneficial at that location.
4. Reduce/remove the hump over the hood or atleast give a cure, instead of current filleted corners.
5. Seal all gaps between surfaces, for example front guard and car body!
6. If its for racing, remove the aft door handles, cover them.
7. Bring the window glass in line with door surface. Or atleast cover the aft window with sheet metal. And remove the protruding black circle.
8. Move up the spoiler, currently its in the wake of car, not sure how effective it actually is.
9. Cover the exposed machinery on either side, below the door.
10......and lots more
What are the considerations? Time/Cost/Car Model?
Regards,
Tejas
RE: Racing car aerodynamic optimization
wing I gradually lowered to reducing drag and improve bottom(rear end) air extracted
because low position still this wing is very effective.
here starting point for rear wing location:
RE: Racing car aerodynamic optimization
Radek
RE: Racing car aerodynamic optimization
There are lot of other things, which you may probably already thinking about:
1. Change wing mirrors in style with new cars. Instead of just a rectangular piece, you can put mirrors from current car variants. Else you can get rid of wing mirrors, can try body mounted camera. You can argue F1 uses rectangular mirrors!
2. If you modify the tyre covers, you will more or less end up with something similar to Beetle car. Not sure, how beautiful it would look thou!
3. The tail end, I believe you are going to cover. Basically, Photo of Car in Wind Tunnel's Brown portion of the body, unless you have some specific reason!
RE: Racing car aerodynamic optimization
I do not need any mirrors(always only one car on track)
sorry, points 2.and 3. I do not understand well.
RE: Racing car aerodynamic optimization
http://casualsociety.co.za/?p=1820
And eliminate the wheel arch extensions and fit narrower tires like Greg said.
To compromise this redesign the cars bottom to include ground effect (http://casualsociety.co.za/?p=1820)
Properly designed, you can have superior traction at lower speeds as well as reduced drag at higher speeds. This will also give you better acceleration (lowered rotating inertia from thinner wheels and tires)
Cheers,
Fe (IronX32)
RE: Racing car aerodynamic optimization
Fe (IronX32)
RE: Racing car aerodynamic optimization
I have a flat floor - I want slight downward inclination front end body
previously I had an 8 inch wheel width,
after installing these 10 inch wheels, the car improving time approximately around 1 second at 1 km in hill climb technical tracks!
so I'm really do not want to narrow wheels
RE: Racing car aerodynamic optimization
Mike Halloran
Pembroke Pines, FL, USA
RE: Racing car aerodynamic optimization
can this hole(bumper side output) help air evacuation and further reduce pressure in the under hood
and improve the efficiency my front splitter?