FSAE Design -- help needed please

[AeroGT3]

Just to put the numbers into perspective, that would equate to 200 lbs at 70 mph and almost 400 lbs at 100 mph, plus or minus. That's amazing for a tray that's only 5 or so foot long.

Those are low numbers as far as trays go. What's a 5 by 2 foot tray make if it lower the pressure by 0.1 Psi? 144 lbs.

That statement makes it sound like any 5 year old can do this. Let's not take for granted the work it would take to get that tenth PSi reduction. Tant easy ..

Yeah, its a lot of design work to get that 1/10th, Psi. I am just saying that when done correctly, the numbers you quoted are easy to achieve.

[AeroGT3]

another small pice of advice make a quick dirty set of wings and throw on the car



note the excessive amount of glue

just to demonstrate how big of a difference it can make

we had a front one as well held on with some duct tape the results were rather eye catching


the newer set of wings is a big step forward form this one so im expecting good results

the tray is waiting for it to stop snowing for further testing

You have the right idea going. We did the same thing with our team - built a crude Aero setup just to demonstrate that it worked, then moved to well designed, well constructed pieces afterwards.

But I will say, even for a crude setup, the angle of attack and camber is insanely high.

[flynfrog]

it has massisve amounts of sepretaion but on the other hand it still worked

[flynfrog]

we took nasa foil sim data and made teh base airfoil then threw on a second element cfd was done after it went on the car but it still was a fun test for a weekend with every one going wow it realy does work

[BreezyRacer]

This might sound a little aero stupid to some, but your mount is structured in a way that that it might make a good airbox for your intake, pulling air from the high pressure top side of the wing. Humm..

[flynfrog]

that car is a few years old we have a differnt intake now but it might work

[Strucnjak]

Hey guys we(Monash) have been running wings for the past few years.

There are about 4 or 5 SAE papers that we have released. They have profiles and wind tunnel data in them with on track performance evaluation. Look for papers by Scott Wordley. Scott will be presenting his latest paper at the SAE confrenece in April.

Also regarding our wings, we run multi element front and rear wings taht are mounted unsprung. We had a diffuser in 02 however the downforce they created and the hassle to make them was not worth the extra weight and effort. There were bigger gains from running more elements and more camber on our wings. The biggest problem is that on an FSAE car the wheelbase is not long enough to allow decent sized underbody tunnels.

With regards to driving charateristics, the cars are alot easier to drive and you can push alot harder and brake alot harder. With wings on we have never spun the car because the endplate we run stablise the car in yaw.

Find the papers and read them, we have put alot of time and effort into validating the wings and it is a good resource.

[AeroGT3]

Hey guys we(Monash) have been running wings for the past few years.

There are about 4 or 5 SAE papers that we have released. They have profiles and wind tunnel data in them with on track performance evaluation. Look for papers by Scott Wordley. Scott will be presenting his latest paper at the SAE confrenece in April.

Also regarding our wings, we run multi element front and rear wings taht are mounted unsprung. We had a diffuser in 02 however the downforce they created and the hassle to make them was not worth the extra weight and effort. There were bigger gains from running more elements and more camber on our wings. The biggest problem is that on an FSAE car the wheelbase is not long enough to allow decent sized underbody tunnels.

With regards to driving charateristics, the cars are alot easier to drive and you can push alot harder and brake alot harder. With wings on we have never spun the car because the endplate we run stablise the car in yaw.

Find the papers and read them, we have put alot of time and effort into validating the wings and it is a good resource.

Do you yourself have digital copies of these papers?

[Strucnjak]

if you give me your email i will try and find them and send them

[miqi23]

Just wondering if any of you FSAE guys managed to complete your underbody designs and have actually tested it? Just curious about the sort of down-force figures you are getting at the moment...

[flynfrog]

Just wondering if any of you FSAE guys managed to complete your underbody designs and have actually tested it? Just curious about the sort of down-force figures you are getting at the moment...

if we get a running car in the next two weeks there is a good chance i can give you real world daq off the car but only time will tell