Mmmmmmmmmm.
The front sure wouldn't be fun to package, but totally worth it.
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Feb. 7, 2012 7:27 p.m. unevolved Dork
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Feb. 7, 2012 7:29 p.m. chaparral Reader
I've got a good way to make it work on the front end...
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Feb. 10, 2012 12:36 p.m. fritzsch Reader
How does the design of that even work?
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Feb. 10, 2012 12:43 p.m. unevolved Dork
Here's a picture of Maryland's car that kind of shows how they did it.
It looks like they've got a 4-bar linkage arrangement locating the front wing, with rods connecting the wing to the front rockers. Here's a better picture with no body:
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Feb. 19, 2012 12:34 a.m. unevolved Dork
Took one of the old cars out for some wet practice today- http://www.youtube.com/watch?v=sSgx6kHTrVc
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Feb. 19, 2012 7:01 a.m. Graefin10 Dork
Is there a regulation wheel diameter and tire size for FSAE? Where do you get wheels and tires for them? What size do you use? Is it a special tire for autoX?
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Feb. 19, 2012 4:19 p.m. unevolved Dork
Graefin10 wrote:
Is there a regulation wheel diameter and tire size for FSAE?
So long as it's over 8", you can run whatever you want. We actually tried to buy 8" tires, but Hoosier wouldn't make them for us, even though we said we'd order their minimum (around 50, I think). Personally, I'm glad, as the 10" wheels are enough fun to package.
Graefin10 wrote:
Where do you get wheels and tires for them?
We buy our wheels in pieces from Keizer (at least recently for the 10"), and the tires come from Hoosier.
Graefin10 wrote:
What size do you use? Is it a special tire for autoX?
We use a Hoosier 18x7x10 LC0, with is a soft bias-ply autocross compound, but there's no tire data for it in this size. So we don't know quite as much about how it's going to behave as we'd like, but we've got some experience with it and we're confident it's worth pursuing.
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Feb. 19, 2012 5:14 p.m. Graefin10 Dork
In reply to unevolved:
Thanks! I just checked out the Keiser site. Sure are some great looking wheels. Expensive I'll bet too.
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Feb. 19, 2012 8:48 p.m. unevolved Dork
They're not cheap, but you could certainly spend more if you tried. We just got a quote for barrels for 10x7s (6" inner barrel, 1" outer barrel) for $387 for all four corners.
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Feb. 19, 2012 10:41 p.m. chaparral Reader
The Keizers are cheap for what you get. They're good wheels and pretty light. Just make sure to check them for run-out.
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Feb. 19, 2012 11:12 p.m. unevolved Dork
More video whoring: A run from today's autocross in an older car.
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Feb. 19, 2012 11:56 p.m. DWNSHFT Reader
Looking at that last photo above, the driver packaging looks pretty extreme. I suppose for autocross you're less concerned with driver fatigue. And I suppose with enough downforce your right foot just stays flat.
Is that scrunched of driver position typical in FSAE?
David
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Feb. 20, 2012 12:05 a.m. chaparral Reader
Travis is very tall, and '09 wasn't built around a "template rule" for the driver's compartment. '12 will have more room, which will be nice for the bigger drivers. This year, our pedals will really be adjustable, so drivers small and large will be able to run it.
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Feb. 20, 2012 7:25 a.m. unevolved Dork
Our cars aren't as tight as that Maryland car, I'll agree his legs are at a pretty tight angle. Some drivers can't reach the pedals without adjustment in our cars.
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Feb. 20, 2012 7:42 a.m. alfadriver SuperDork
unevolved wrote:
More video whoring: A run from today's autocross in an older car.
Does that thing understeer as much as it looks?!?
Second question, which is really a follow up to the first- since you run the car cold (tires, mainly) how much time does it take the tires to warm up enough that the driving dynamics change- in the video, it appears that you get better grip somewhere around 40 seconds...
is that close? and if it does take time- what have you found out as a team that has given you the best performance to 'overcome' that?
I've only drove one FSAE car- UM Dearborn, and I had it for longer than a typical autocross run- front was WAY to tight on it, but they thought the front stiffness was good... odd. Just in a basic circle, it was like pushing snow....
Fun thread, btw.
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Feb. 20, 2012 9:01 a.m. unevolved Dork
alfadriver wrote:
Does that thing understeer as much as it looks?!?
Second question, which is really a follow up to the first- since you run the car cold (tires, mainly) how much time does it take the tires to warm up enough that the driving dynamics change- in the video, it appears that you get better grip somewhere around 40 seconds...
is that close? and if it does take time- what have you found out as a team that has given you the best performance to 'overcome' that?
I've only drove one FSAE car- UM Dearborn, and I had it for longer than a typical autocross run- front was WAY to tight on it, but they thought the front stiffness was good... odd. Just in a basic circle, it was like pushing snow....
Fun thread, btw.
Understeer? Yes. Yes it does. That car was designed to have an extra 90-100 pounds of electric motor, batteries, accumulators, and motor controllers, so the designed driving dynamics are a tad off. We don't really have a lot of funding coming our way lately with the economy being a tad depressed, so we can't really afford to buy new tires for the old cars like this one running 13s. Those tires are at least three years old and hard as rocks. There's only so many suspension adjustments we're willing to make until we get some properly sticky tires on there.
The driver in that video had a lot of experience in karting, so he intentionally scrubbed them around to get some more heat into the fronts, as the course didn't really have a lot of heavy braking zones to get much heat into them. With some proper tires on there, we're confident he could have picked up at least two seconds. This car really isn't a good example of how we're capable of making a car handle, but given that the chassis was way overdesigned for its current weight, and the powertrain is simplified back to a stock carb'd WR250f, it's the reliable workhorse of the bunch.
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Feb. 22, 2012 9:09 a.m. unevolved Dork
Let's play "name that part." First machining operation's done, but it's not finished.
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Feb. 22, 2012 9:13 a.m. alfadriver SuperDork
In reply to unevolved:
lower ball joint.
Probably from the front.
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Feb. 22, 2012 9:35 a.m. unevolved Dork
Bam. Nailed it.
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March 3, 2012 11:12 a.m. unevolved Dork
Making some more progress...
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March 10, 2012 12:59 p.m. unevolved Dork
Magnesium rockers! Eeeeeeeeeeeeeee!
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March 15, 2012 5:28 p.m. unevolved Dork
The car's back from paint. As soon as it cures, we can start assembly.
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March 28, 2012 5:10 p.m. loudes13 New Reader
I know we ruled these out for road racing on the 1st page (60" wheelbase, feet in front of the tires, etc), but has anyone used something like these for limited time trials, solo1, or hill climbs?
Seems like it could be a blast and I know that I've seen crazy fast Amods run hill climbs. Could the aluminum roll bar be legal?
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March 29, 2012 12:37 a.m. unevolved Dork
Could be, I'd imagine. I haven't looked into it, but I know Maryland set FTD at Solo II Nats last year with their FSAE car.
I'm not sure what you mean by aluminum roll bar. Our chassis is all 4130.
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March 29, 2012 6:48 a.m. tpwalsh Reader
Do the rules state that the aero devices have to act upon the body or can you attach them to the uprights? (aka let the aero act directly on the wheels vs having to go through the suspension?)
