RX7Club.com - Mazda RX7 Forum - downforce spoiler

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downforce spoiler

Needs moar cleico's :)

Looks nice dude.....but I thought the FB was the dragcar?

The FB is the Drag car... We're just getting ready for the 300km/h gumball rally's in
Japan with RE-Amemiya!! Lol

And maybe a few "super street power adder" runs with CSCS before hand :)

Quote:

Originally Posted by classicauto (Post 8303012)

Needs moar cleico's :)

Looks nice dude.....but I thought the FB was the dragcar?

Should look good once it's all done. Good job.

i like it! i think itll look real clean when its done

Where is mine???????????

Looks like a nice place to lay down and catch a couple ZZZ's on longer journeys.

Seriously, I like it.

That's not a wing, it's a spoiler, and at a flat angle, it's probably making LIFT, although you may be realising a slight reduction in drag.

http://www.fatcatmotorsports.com/ go there, look in the Chassis set-up menu, click on the Aerodynamics articles link, download it and read it.

What do we THINK of it?

Looks kinda fugly. Why not just buy the REA one, even Super*Now uses it on their TA car and that thing rapes with only a s5 hybrid turbo. Go figure.

You'd probably get a lot better effect if you put it higher up to get clean airflow. homemade wings are a nice idea and can be made to work, but it's hard to engineer properly the airfoil shape. A nice large CF wing is probably the way to go if you really want downforce.

so you guys got a wind tunnel now down there?

haha...kidding...

Quote:

Originally Posted by 01Racing (Post 8303904)

Where is mine???????????

Well, we can always make u one but it would be a lil different for ur car. It would be a lil bigger and the shape would change abit.

Quote:

Originally Posted by Black91n/a (Post 8304005)

That's not a wing, it's a spoiler, and at a flat angle, it's probably making LIFT, although you may be realising a slight reduction in drag.

This wing is a drag style wing, one of the reasons i made it so small is because its a street car not a crazy race car lol. but it will work really good.

http://www.fatcatmotorsports.com/ go there, look in the Chassis set-up menu, click on the Aerodynamics articles link, download it and read it.

The Aerodynamics articles link doesn't work.

Quote:

Originally Posted by nik (Post 8304896)

This wing isn't by any means a homemade wing. A big cf wing isn't always better, a big ass wing isn't always better. A lot of people look at looks before looking at how its going to function on the car. I see what ur saying, don't get me wrong. Garth has built 100's of wings in the past, his even built wings for top fun 9000hp drag cars. i trust that what his teaching and telling me to do is right.

Luke

So wait, is the FC turning into a drag car?

that looks like it'll make lift, not downforce

you've built part of a reverse airfoil there, like an upside down airplane wing.

the builder replies with common sence

Quote:

Originally Posted by Terrh (Post 8305613)

that looks like it'll make lift, not downforce

you've built part of a reverse airfoil there, like an upside down airplane wing.

To create the proper amount of down force to keep the rear of this car glued to the ground the factors of aerodynamics are taken into proper concideration and this car is what it is and no more than that.
We are not Mclearen motors sports nor do we have the budget to do hours of wind tunnel testing for this street car but i can say in all my years of chassis design and racing knowledge i know that this wing or "aerofoil" will create down force for this car at its top adjustment. This wing is also going to route stale airflow past the rear of this altered body shape of this vehicle. the long and short of this debate is that if there was airflow passing under it and over it at the same time all wings of similar design would in fact create lift or drag depending on the aerofoil tip or rear contact area, in this case the wing will do its job and also looks bad ass. I can not wait to see this powder coated satin black.
Thanks guys love the feedback.

Garth

Since it is for a race car it's good. Personally for a streetcar i hate the shopping cart handles, but this is a proper application for it.

Quote:

Originally Posted by Terrh (Post 8305613)

that looks like it'll make lift, not downforce

you've built part of a reverse airfoil there, like an upside down airplane wing.

Logic man, airplanes go up, so if its an upside down airplane wing it will go down...

I think itll look good as a racing application for sure.

Quote:

Originally Posted by R.P.M. (Post 8305239)

Garth has built 100's of wings in the past, his even built wings for top fun 9000hp drag cars. i trust that what his teaching and telling me to do is right.

Luke

My comments were only regarding road race cars, if this is a drag car then there's a different set of objectives that I don't know much about and this may work just fine.

Just trying to help you guys out based on our experience and what I've seen. Just about every road race car I've seen has a high mounted wing unless rules prevent it.

I think Terrh is a little confused there...

Quote:

Originally Posted by R.P.M. (Post 8305239)

The Aerodynamics articles link doesn't work.

Works for me.

It looks to me that RPM is building a standard drag spoiler. The basic design has been used and proven many many times on Funny Cars, Pro Mod and Pro Stock cars. The primary purpose is to cancel rear end lift and at the same time streamline the airflow off the back of the car to reduce E.T. limiting drag. It looks the business for a drag car, but it is not the most efficient way to create downforce in a road race car.

A little education about wings versus spoilers may help. A wing cancels lift and in some cases creates downforce based on the difference in airspeed over the top surface of the wing versus the bottom. A faster airflow over the bottom creates a lower pressure area under the wing therebye creating download or downforce. A faster airflow over the top creates a lower pressure above the wing creating lift. Everything else about wings, such as Gurney's, end plates, tumblers, curvatures, multiple wings, etc..., are just different ways of maximizing this effect and minimizing drag.

Spoilers work in a separate way entirely. The spoiler sticks up into the airflow slightly blocking the high speed air flowing around the car. This air that is blocked, builds up until it creates a higher pressure area ahead of the spoiler. This higher pressure area pushes down on the flat surface upstream of the spoiler and creates downforce. They really only work well when there is a large flat surface for the air to press down on. The FB and FC RX7's do not have a flat and large trunk lid so a spoiler would have minimal benefit on a stock body. I like the idea of providing a large surface area cantilevered off the back of the car to make the most benefit of a very low drag spoiler. For a drag car this works really well. I like the engineering in this application. The large side dams reduce spillover and the large flat area maximizes effect. In my slightly informed opinion, great work RPM. They went for function over style and in a race car that is what is criticle.

Eric

^^Wow thats an education for a day :)

Good work man, seems like it will be a nice setup.

so, I may have forgotten that airplanes go up.

if they, in fact, do, then yeah, this should push down.

so, umm, nevermind :P

Like I said before Joe, WHERES MINE!!!!!!!!!!!???????????? I'd like mine in carbon fiber though, or at least my "carbinium"