| GarySheehan | 09-18-2001 02:29 PM |
Kartboy Represents
Some of you wanted to see the race car with the Kartboy logos, so here you go...
[IMG]http://www.teamsmr.com/Kartboy_Side_Low_Web.jpg[/IMG]
There are more pictures on the website with the Kartboy logo on the wing that Kartboy/All Wheel Engineering sent to us. This is not a sourced product. It is a custom wing designed and fabricated by the hands of a Deadrick :)
You can see it at:
[url]www.teamSMR.com/html/race_shop.html[/url]
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
[IMG]http://www.teamsmr.com/Kartboy_Side_Low_Web.jpg[/IMG]
There are more pictures on the website with the Kartboy logo on the wing that Kartboy/All Wheel Engineering sent to us. This is not a sourced product. It is a custom wing designed and fabricated by the hands of a Deadrick :)
You can see it at:
[url]www.teamSMR.com/html/race_shop.html[/url]
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| Travis R | 09-18-2001 02:37 PM |
-edit #1- you fixed the link
The car is looking really professional. I'd like to see some more shots of the new front splitter.
-edit #2- OK I went to the page and look at the new pictures. Are you planning on cutting some holes for brake ducts? Or are you getting air from the little vertical vents in the bumper? I thought one of the problems the front splitter caused was overheating brakes.
Like I said, looking good. :cool:
The car is looking really professional. I'd like to see some more shots of the new front splitter.
-edit #2- OK I went to the page and look at the new pictures. Are you planning on cutting some holes for brake ducts? Or are you getting air from the little vertical vents in the bumper? I thought one of the problems the front splitter caused was overheating brakes.
Like I said, looking good. :cool:
| Fmdeadrick | 09-18-2001 03:12 PM |
There will be now mistaking this machine as a regular ol' street car. The side skirts make excellent additional billboard space. Well done!
Mark
Mark
| GarySheehan | 09-18-2001 03:24 PM |
Just received the brake ducts from BSR today.
They will be inserted in the center of the airdam and feed the front brakes with 3" flexible ducting. It's going to be a challenge to get the ducts close to the rotor because there's not a whole heck of a lot of room down there.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
They will be inserted in the center of the airdam and feed the front brakes with 3" flexible ducting. It's going to be a challenge to get the ducts close to the rotor because there's not a whole heck of a lot of room down there.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| Marquis | 09-18-2001 04:38 PM |
Very nice indeed. I can't wait to see the brake ducts on as well.
| mykrrrr | 09-19-2001 06:38 AM |
Looks a bit rycey to me... :lol: What do you do Gary...road race this thing??? HAHAHAHAHA :p
Looks good. :D
-myk
Looks good. :D
-myk
| Travis R | 09-19-2001 09:46 AM |
I've got another question for you Gary. Why do the end plates on the rear wing only extend downward? It seems like you would loose some of the effective wing area by the air slipping over the sides instead of going over the back. And if anything it seems like having a larger end plate would help with high speed oversteer. I'm no aerospace engineer, just going on intuition. :)
Thanks
Thanks
| GarySheehan | 09-19-2001 12:06 PM |
Travis,
As Mark explained it to me, the vast majority of the downforce generated by a wing comes from it's lower surface. Higher endplates would generate more drag with very little additional downforce.
UNLESS...a Gurney flap is added. If you do that, the upper surface of the wing is more critical, and higher endplates would be effective. Since we're adding a Gurney flap, you'll be seeing higher endplates soon.
Mykrrr,
I wish! It's just for show ;)
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
As Mark explained it to me, the vast majority of the downforce generated by a wing comes from it's lower surface. Higher endplates would generate more drag with very little additional downforce.
UNLESS...a Gurney flap is added. If you do that, the upper surface of the wing is more critical, and higher endplates would be effective. Since we're adding a Gurney flap, you'll be seeing higher endplates soon.
Mykrrr,
I wish! It's just for show ;)
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| Fmdeadrick | 09-19-2001 12:13 PM |
This has been discussed previously, but the idea is: Most wings, when designed for high lift and low drag, high L/D ratio, try to keep the flow attached at the rear, to prevent stalling, loss of negative pressure, and therfore loss of lift. The car wing is upside down obviously. Effectively an aircraft wing is sucked up, and a race car wing is sucked down. Cars such as NASCARs just plain suck, because they use nearly entirely mechanical downforce, the physical ramming of air into the rear spoiler to force the rear end down. No science, no surprise.
For F-1 and Indy type cars, with multiple element wings, end plates are used for holiding the multiple elements together, lateral stiffness, and mounting to the car. Advertising space is, of course, also important. Touring cars typically mount near the center of the car, have lower downforce, and are usually single elements.
An important thing to note is the aspect ratio of the wing, the width relative to the chord length. On an F1 car it is rather low. For us it is quite high. The effect of end plates is to simulate a wider wing. Some commercial airliners have added winglets to their planes in a similar fasion. I have done research from various sources, an have found NASA wind tunnel data regarding various end plate configurations. For ths size wing we are using, in the speed range and Reynolds number, an end plate in the configuration we use will roughly add 15% relative to the wing alone. By adding the same height to the top of the wing, a possible 1-2% could be added. Not much. If we were running in the stalled region, using mechanical downforce like NASCAR, this would "help."
Gary will be adding a collection of Gurney flaps to his parts bin, and with heights ranging from 0.25" to 0.50", an increase in the upper height of the end plate will help a bit. No higher than the Gurney itself. Typical Gurneys max out in effeciency at about 5% of chord length.
I hope that helps a bit. I am certainly not a highly paid aerodynamicist, but I have quite a bit of experience in aircraft and race car aero programs.
Mark
[url]www.kartboy.com[/url]
For F-1 and Indy type cars, with multiple element wings, end plates are used for holiding the multiple elements together, lateral stiffness, and mounting to the car. Advertising space is, of course, also important. Touring cars typically mount near the center of the car, have lower downforce, and are usually single elements.
An important thing to note is the aspect ratio of the wing, the width relative to the chord length. On an F1 car it is rather low. For us it is quite high. The effect of end plates is to simulate a wider wing. Some commercial airliners have added winglets to their planes in a similar fasion. I have done research from various sources, an have found NASA wind tunnel data regarding various end plate configurations. For ths size wing we are using, in the speed range and Reynolds number, an end plate in the configuration we use will roughly add 15% relative to the wing alone. By adding the same height to the top of the wing, a possible 1-2% could be added. Not much. If we were running in the stalled region, using mechanical downforce like NASCAR, this would "help."
Gary will be adding a collection of Gurney flaps to his parts bin, and with heights ranging from 0.25" to 0.50", an increase in the upper height of the end plate will help a bit. No higher than the Gurney itself. Typical Gurneys max out in effeciency at about 5% of chord length.
I hope that helps a bit. I am certainly not a highly paid aerodynamicist, but I have quite a bit of experience in aircraft and race car aero programs.
Mark
[url]www.kartboy.com[/url]
| Fmdeadrick | 09-19-2001 12:14 PM |
How is that for team work?
Mark
Mark
| Travis R | 09-19-2001 05:55 PM |
Excellent response guys! I was thinking of the wing the wrong way (NASCAR style). I did a quick search about the "Gurney flaps" ( [url]www.insideracingtechnology.com/tech104gurney.htm[/url] ). And now have a better idea of what you guys are doing. Thanks
| [email protected] | 09-19-2001 07:37 PM |
[QUOTE]Cars such as NASCARs just plain suck[/QUOTE]
amen to that
after working for Roush Ind. i can attest to that. :lol: :lol: :lol:
[email][email protected][/email]
amen to that
after working for Roush Ind. i can attest to that. :lol: :lol: :lol:
[email][email protected][/email]
| jerome02rs | 09-20-2001 12:21 AM |
Mark,
Have you seen the serrated Gurney flap? I read something about this a while back. The height of the flap=.015Chord and the pitch of the serrated edge=.03Chord. The serrations are angled at 90 degrees (think of a saw tooth.)
This type of flap was shown to improve the L/D ratio by 6% compared to an airfoil without a flap. The Gurney is still mounted at 90 degrees to the camber line. I always crack up when I see a Gurney mounted to the underside of a wing!
I know this serrated design was patented in the U.S., but it's not like you're going to sell them and make money from using it. 6% extra downforce with no drag penalty, hmmm....
On another note, are you guys planning on using a rear diffuser or vortex generators on the splitter?
Just curious as to your thoughts on this.
Jerome
Have you seen the serrated Gurney flap? I read something about this a while back. The height of the flap=.015Chord and the pitch of the serrated edge=.03Chord. The serrations are angled at 90 degrees (think of a saw tooth.)
This type of flap was shown to improve the L/D ratio by 6% compared to an airfoil without a flap. The Gurney is still mounted at 90 degrees to the camber line. I always crack up when I see a Gurney mounted to the underside of a wing!
I know this serrated design was patented in the U.S., but it's not like you're going to sell them and make money from using it. 6% extra downforce with no drag penalty, hmmm....
On another note, are you guys planning on using a rear diffuser or vortex generators on the splitter?
Just curious as to your thoughts on this.
Jerome
| Scooby South | 09-20-2001 02:01 PM |
Right on Jerome....I was thinking the same thing....on the Rear Diffuser and Vortex Generator....Was also wondering maybe about adjustable Spliter Winglets as well...to help contain the Force..Shoot..while your at it just build a whole Ground Effects Tunnel..There are some drawbacks tho...More Grip..More tire wear...
and Suspension Changes as well..
Go get um Gary...:D:D:D
and Suspension Changes as well..
Go get um Gary...:D:D:D
| Fmdeadrick | 09-20-2001 08:09 PM |
I haven't heard of the serrated Gurney, though I have seen sinewave type trailing edges to accomplish similar results.
A new aero package is in the work. Most of what is seen above is temporary. Diffusers, dive plates, strakes, and the kitchen sink are all in the initial equations.
Mark
A new aero package is in the work. Most of what is seen above is temporary. Diffusers, dive plates, strakes, and the kitchen sink are all in the initial equations.
Mark
| EricSC | 09-21-2001 09:21 AM |
Gary,
Two words:
Rear Diffuser:D
-Eric
Two words:
Rear Diffuser:D
-Eric
| skidplatez | 09-21-2001 10:25 AM |
Wow this looks really gret guys! So cool to see a functional aero-kit!!!
Out of curiosity what is it made of? The lower work looks like Polyethylene but I can't really tell, also is the wing section(yellow part) aluminum?
Out of curiosity what is it made of? The lower work looks like Polyethylene but I can't really tell, also is the wing section(yellow part) aluminum?
| GarySheehan | 09-21-2001 12:17 PM |
The vertical yellow pieces around the bottom of the car are made of fiberglass. The horizontal front splitter section is 1/2" plywood (it's a wearing part as it occassionally hits the track surface and curbings). The rear wing is carbon fiber over a foam core. All of the peices were filled and sanded to make them nice and smooth for painting.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| Dirt Man | 09-21-2001 12:53 PM |
All your missing now is this:
[IMG]http://www.bayflite.com/images/flag.gif[/IMG] :D
[IMG]http://www.bayflite.com/images/flag.gif[/IMG] :D
| GarySheehan | 09-21-2001 01:09 PM |
Dirtman,
Trust me, it's in the works. Looking for vinyl sticker flags to put on the car.
Sort of a fast moving 9/11/01 memorial.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
Trust me, it's in the works. Looking for vinyl sticker flags to put on the car.
Sort of a fast moving 9/11/01 memorial.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| whitt | 09-21-2001 02:04 PM |
Air ducts
any pics of those air ducts yet? by the way I verry much like your wrx good luck
DW
DW
| GarySheehan | 09-21-2001 03:11 PM |
The brake ducts are still sitting near the car. They'll probably go in over the weekend.
Thanks for all the kind words, everybody!
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
Thanks for all the kind words, everybody!
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| GarySheehan | 10-01-2001 08:20 PM |
Updates to Aero
Here are the updates...
Gurney flap and larger end plates:
[IMG]http://www.teamsmr.com/wing endplates web.jpg[/IMG]
Brake ducts:
[IMG]http://www.teamsmr.com/Sears 34 Low Web.jpg[/IMG]
The brake ducts and new pads worked very well at Sears Point. The front brakes are still spitting a lot of brake dust and there are some faint surface cracks on the rotors after one day at the track. Even with the ducting, our brakes are getting very hot. But Sears Point doesn't really have any long straights in it's current configuration to cool the brakes on.
We finally had the opportunity to get Joel Gat in the passenger seat on the track. He rode shotgun with me for a full 20 minute session. He had a big smile on his face when we got out of the car and it sounded like he had a lot of fun!
We continue with our mishaps, though. We had two issues this weekend during testing. In the first session of the day I got one and a half laps in. I'd done a nice warm-up lap and was really picking up the pace to heat the tires. As I turned in for the left hand turn 3A the car suddenly snapped into a left hand spin and flying off the track I went! It happened so fast I really didn't have any time to react. As I looked though the windshield at the corner I'd just left, I noticed a nice sheen of something all over the track. I quickly shut off the motor as I didn't want to hurt it because one of it's two precious fluids had just puked all over my rear tires in mid corner.
I sat there for just a few seconds, waiting for a tow truck, when a Pro RX7 came through the same corner and found my little surprise. When I saw how sideways he and the car behind him got, I figured a slightly hurt motor was much better than a very crashed car. I was directly in an impact zone. I quickly fired up and got the hell out of there!
On my way back to the pits I received 2 black flags. When I got there I shut off and Joel started poking around. Turns out the lower radiator hose had popped off and we lost ALL of our water. No biggie. We put the hose back on and filled up again.
In the session with Joel as a passenger, we both started smelling something funky. After the session we discovered that the right front outer CV boot had split wide open and plopped CV grease all over the inside of the wheel, caliper, etc. I think this is the last of the damage caused by our overheating the brakes at Road America. We had split the boot on the other side and I'd replaced it. I figured the right side might be OK. It wasn't. Well, that's partially what testing is for, isn't it?
i've got some great pictures of the trashed brakes from Road America. Those will be up on the website soon. I'll let everyone here know when they're up.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
Gurney flap and larger end plates:
[IMG]http://www.teamsmr.com/wing endplates web.jpg[/IMG]
Brake ducts:
[IMG]http://www.teamsmr.com/Sears 34 Low Web.jpg[/IMG]
The brake ducts and new pads worked very well at Sears Point. The front brakes are still spitting a lot of brake dust and there are some faint surface cracks on the rotors after one day at the track. Even with the ducting, our brakes are getting very hot. But Sears Point doesn't really have any long straights in it's current configuration to cool the brakes on.
We finally had the opportunity to get Joel Gat in the passenger seat on the track. He rode shotgun with me for a full 20 minute session. He had a big smile on his face when we got out of the car and it sounded like he had a lot of fun!
We continue with our mishaps, though. We had two issues this weekend during testing. In the first session of the day I got one and a half laps in. I'd done a nice warm-up lap and was really picking up the pace to heat the tires. As I turned in for the left hand turn 3A the car suddenly snapped into a left hand spin and flying off the track I went! It happened so fast I really didn't have any time to react. As I looked though the windshield at the corner I'd just left, I noticed a nice sheen of something all over the track. I quickly shut off the motor as I didn't want to hurt it because one of it's two precious fluids had just puked all over my rear tires in mid corner.
I sat there for just a few seconds, waiting for a tow truck, when a Pro RX7 came through the same corner and found my little surprise. When I saw how sideways he and the car behind him got, I figured a slightly hurt motor was much better than a very crashed car. I was directly in an impact zone. I quickly fired up and got the hell out of there!
On my way back to the pits I received 2 black flags. When I got there I shut off and Joel started poking around. Turns out the lower radiator hose had popped off and we lost ALL of our water. No biggie. We put the hose back on and filled up again.
In the session with Joel as a passenger, we both started smelling something funky. After the session we discovered that the right front outer CV boot had split wide open and plopped CV grease all over the inside of the wheel, caliper, etc. I think this is the last of the damage caused by our overheating the brakes at Road America. We had split the boot on the other side and I'd replaced it. I figured the right side might be OK. It wasn't. Well, that's partially what testing is for, isn't it?
i've got some great pictures of the trashed brakes from Road America. Those will be up on the website soon. I'll let everyone here know when they're up.
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| OnTheGas | 10-01-2001 10:34 PM |
Re: Updates to Aero
[QUOTE][i]Originally posted by GarySheehan [/i]...The front brakes are still spitting a lot of brake dust and there are some faint surface cracks on the rotors after one day at the track. Even with the ducting, our brakes are getting very hot. But Sears Point doesn't really have any long straights in it's current configuration to cool the brakes on...[/B][/QUOTE]Gary - First of all, congrats to you and the team for new aero mods. Mark has done you guys well, it appears. Also, the car looks great now! Gotta question... Why not paint the "Kartboy" letters w/black or blue? The contrast would make "Kartboy" jump out. Or if you need to keep that color on the letters, a dark outline on each letter would make them jump out. Just an idea to help you out maybe...
But I'm more concerned that your brakes are still running plenty hot. As a fan of the team, I'm concerned that your overheating problems are not completely solved based on what you mentioned about the Sears Point test. Are you folks considering further solutions to prevent brake overheating?
Finally, at California Speedway, do you know which track you will be using? Is it the "Auto Competition Course" which is the 2.88-mile circuit with 21 turns, or is it the " Interior Road Course" at 1.5-mile (13 turns) or 1.55-mile (15 turns)? And how does the course look for you and your wrx? Do you think it will be friendly to you?
But I'm more concerned that your brakes are still running plenty hot. As a fan of the team, I'm concerned that your overheating problems are not completely solved based on what you mentioned about the Sears Point test. Are you folks considering further solutions to prevent brake overheating?
Finally, at California Speedway, do you know which track you will be using? Is it the "Auto Competition Course" which is the 2.88-mile circuit with 21 turns, or is it the " Interior Road Course" at 1.5-mile (13 turns) or 1.55-mile (15 turns)? And how does the course look for you and your wrx? Do you think it will be friendly to you?
| pio!pio! | 10-02-2001 05:18 AM |
Has work begun on engine management software?
Have you guys decided on what kind of ECU to use?
Have you guys decided on what kind of ECU to use?
| RyanC | 10-02-2001 11:35 AM |
Gary and crew: the car looks absolutely bitchin'! Keep on with the excellent driving and the race engineering, I'm very impressed with the changes you've made since starting out. Good luck!
Ryan
[url]www.twofoolsracing.com[/url]
Ryan
[url]www.twofoolsracing.com[/url]
| donjuan | 10-02-2001 01:36 PM |
All I can say...
...is that I want a ride. puhleeeeaaaase!
| GarySheehan | 10-02-2001 01:55 PM |
I'll be giving rides at Angus's Laguna Seca track day on December 14th. :)
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
Gary
Sheehan Motor Racing
#72 Subaru WRX USTCC
[url]www.teamSMR.com[/url]
| donjuan | 10-02-2001 02:01 PM |
I'm thinking I have a "business trip" scheduled to CA that day. Oh hey what do you know I do...
:lol: :lol: :lol: :lol:
...maybe I can come up with a good excuse...
:lol: :lol: :lol: :lol:
...maybe I can come up with a good excuse...
| TV3WRX | 10-02-2001 03:33 PM |
I'm in.
OK, I'll definately take you up on that offer for the 14th. I've already planned the trip up there to see the event. Meantime, good luck in Fontana. That one is close to home, so we'll be going to see you run there, too.
Thanks,
TV3WRX
Thanks,
TV3WRX
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