R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 06-08-2006, 12:33 PM   #1
Tech Regular
 
SammyXp's Avatar
 
Join Date: Mar 2004
Location: Winston Salem, NC
Posts: 428
Default LMP Body for Touring Cars

I got tired of looking for a LMP (LeMans Prototype) or GTP style body for touring cars, so I decided to design one myself. I started another thread in the Paint/Body forum here:
http://rctech.net/forum/showthread.php?t=115485
But since I found someone to vacform the shell for me, I decided to start another thread here to discuss the design and hopefully get some suggestions on improving the aerodynamics.

Cliff notes are:

Here's the body (Audi R8):




I've got the opportunity to run the 3D model through some CFD (Computational Fluid Dynamics) software and had some interesting results. The validity of these simulations is in question, since the undertray in this model is smooth. I may try running one with the full chassis underneath it (I've got a TC3 modeled here), but the meshing itself will probably take 4 hours and I'm not sure my workstation can handle it.
For now, it's fun looking at the graphs:


Net drag is calculated to be:
0.62 lbf @30mph
1.72 lbf @50mph

Downforce is reported as:
0.52 lbf @30mph
1.45 lbf @50mph

Again, these numbers are approximated simulations, and not validated with testing as of yet.

The Lexan mold is currently being formed. Should be ready to pull the first few shells in a few weeks.
SammyXp is offline   Reply With Quote
Old 06-08-2006, 12:57 PM   #2
Tech Elite
 
seaball's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2001
Posts: 4,303
Trader Rating: 9 (100%+)
Send a message via Yahoo to seaball
Default

i love you.
__________________
*** The Gate II - Home of Mike Wise ***
seaball is offline   Reply With Quote
Old 06-08-2006, 01:18 PM   #3
Tech Regular
 
Join Date: Oct 2003
Posts: 373
Default

You are so cool
caveman is offline   Reply With Quote
Old 06-08-2006, 01:19 PM   #4
Tech Elite
 
vtl1180ny's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2003
Location: Wrong Island
Posts: 4,963
Default

Quote:
Originally Posted by seaball
i love you.
Can you say Gang bang???

That is excellent.... Kinda makes me wish I had of stuck to my ME degree and taked CAD more seriously....

I know there are a few Can am style bodies still floating around...
__________________
I still lurk....
vtl1180ny is offline   Reply With Quote
Old 06-08-2006, 02:45 PM   #5
Tech Elite
 
seaball's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2001
Posts: 4,303
Trader Rating: 9 (100%+)
Send a message via Yahoo to seaball
Default

i was just thinking one on one, really. unless this was a collaborative effort.
__________________
*** The Gate II - Home of Mike Wise ***
seaball is offline   Reply With Quote
Old 06-08-2006, 02:55 PM   #6
Tech Master
 
Anders Myrberg's Avatar
 
Join Date: Nov 2003
Location: Manīs best friend: Hugo Myrberg
Posts: 1,987
Default

Quote:
Originally Posted by SammyXp
I got tired of looking for a LMP (LeMans Prototype) or GTP style body for touring cars, so I decided to design one myself. I started another thread in the Paint/Body forum here:
http://rctech.net/forum/showthread.php?t=115485
But since I found someone to vacform the shell for me, I decided to start another thread here to discuss the design and hopefully get some suggestions on improving the aerodynamics.

Net drag is calculated to be:
0.62 lbf @30mph
1.72 lbf @50mph

Downforce is reported as:
0.52 lbf @30mph
1.45 lbf @50mph

Again, these numbers are approximated simulations, and not validated with testing as of yet.
Great work! I just donīt know if these numbers are good or bad.
The only thng that I like to comment is the position of the front body posts. Are you sure we can get the clips in between there?
This is where 1/12 should go, if you ask me.
Anders Myrberg is offline   Reply With Quote
Old 06-08-2006, 03:42 PM   #7
Tech Regular
 
SammyXp's Avatar
 
Join Date: Mar 2004
Location: Winston Salem, NC
Posts: 428
Default

Quote:
Originally Posted by Anders Myrberg
Great work! I just donīt know if these numbers are good or bad.
The only thng that I like to comment is the position of the front body posts. Are you sure we can get the clips in between there?
This is where 1/12 should go, if you ask me.
Yeah, I really don't have any numbers to compare to. I had a lot of free time alst week when I modeled up the R8, but now I'm busy again. Else I'd be working on a model of a Stratus for comparison. I might have a guy here do a point cloud and just resolve some sheets from the data. Not totally accurate, but close enough to get some comparative numbers.
It took over 125 iterations for the solution to come even close to convergence, so I really do question how applicable these numbers would be in the real world. But one thing is certain - if I modeled up a Stratus, the comparison would be valid.

The front body posts bothered me, too. That's just where they end up, with the TC3 front bumper. Might be a problem with a few other TC's, possibly. The front shock tower is the biggest challenge with fitting the LMP to a TC. That's a steep rise, in comparison to the real R8. A Porsche Group C car might have made more sense. I just love the R8, though.

vtl1180ny, I'm a BSME, and it was five years of hell for sure, but I love my job now so it had to have been worth it. If you've got any Solid Modeling experience at all, model up a touring car and IGES the file to me so we can compare the drag/lift numbers! Shoot, if ANYONE has an IGES, STEP or parasolid of ANY car, let me know and we'll see how the LMP matches against a regular car.
SammyXp is offline   Reply With Quote
Old 06-08-2006, 03:47 PM   #8
Tech Elite
 
CypressMidWest's Avatar
 
Join Date: May 2003
Location: Central Ohio
Posts: 4,618
Trader Rating: 1 (100%+)
Default

Quote:
Originally Posted by Anders Myrberg
Great work! This is where 1/12 should go, if you ask me.
Oh my Lord, Anders and I actually agree on something!
__________________
Team CRC, PowerPush, Access Race Place, US Indoor Champs, CD SUPERPRO, RK Designs, TxDSkingraphix, Cypress, Founder and lead instructor of the Ian Ruggles Negative Reinforcement Driver Training Program, enroll now.....
CypressMidWest is offline   Reply With Quote
Old 06-08-2006, 06:23 PM   #9
Tech Addict
 
Drew_Cat's Avatar
 
Join Date: Dec 2004
Location: NYC
Posts: 607
Trader Rating: 1 (100%+)
Default

SammyXp keep up the good work.. You got a fan here
__________________
Items for sale:

TURBO GFX>>>> http://www.rctech.net/forum/showthread.php?p=4329165#post4329165
Tekin Battery Nurse >>>> http://www.rctech.net/forum/showthread.php?p=4329173#post4329173

Thanks for looking
Drew_Cat is offline   Reply With Quote
Old 06-08-2006, 06:29 PM   #10
Tech Regular
 
SammyXp's Avatar
 
Join Date: Mar 2004
Location: Winston Salem, NC
Posts: 428
Default

Thanks for the good words, guys. Really not necessary, but confirms my suspicions that there really is a demand for this thing. I guess I wasn't the only one that wanted peak performance, regardless of the rules.
SammyXp is offline   Reply With Quote
Old 06-08-2006, 06:45 PM   #11
Tech Elite
 
speedxl's Avatar
R/C Tech Charter Subscriber
 
Join Date: Jun 2003
Location: Portland Oregon.
Posts: 3,881
Default

omg Where have you been all my life! dude you need to make that fit 12 scale asap!!! aswell as the Porsche. I'm also curious how it would turn out for tourer aswell. I am tired of taxi cabs!!
__________________
Pemberton / R1 / All out motorsports / Team Power Push
speedxl is offline   Reply With Quote
Old 06-08-2006, 07:25 PM   #12
Tech Elite
 
vtl1180ny's Avatar
R/C Tech Charter Subscriber
 
Join Date: Sep 2003
Location: Wrong Island
Posts: 4,963
Default

Sammy, I only know how to draw the old fashioned way. When I learned CAD it was on a 286 and it was horrible. There definitely is a market for LMP bodies. I'm tired of seing the same old shells over and over again... I never finished my degree, I was leaning towards aerospace and then I took a total change in professions... My wife is on me to go back and get my degree in ME.
__________________
I still lurk....
vtl1180ny is offline   Reply With Quote
Old 06-08-2006, 07:30 PM   #13
Tech Master
 
XrayFK's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Posts: 1,463
Trader Rating: 1 (100%+)
Default

That looks great, I would love to run something other than a touring car body. Maybe you can look into some GT style bodies as well.
XrayFK is offline   Reply With Quote
Old 06-08-2006, 07:46 PM   #14
Tech Master
 
ford_racing's Avatar
 
Join Date: Aug 2004
Location: Canberra
Posts: 1,480
Trader Rating: 6 (100%+)
Send a message via MSN to ford_racing
Default

Quote:
Originally Posted by Anders Myrberg
The only thng that I like to comment is the position of the front body posts. Are you sure we can get the clips in between there?
This is where 1/12 should go, if you ask me.
What if you were to rotate the posts 90 degrees, so the holes are pointing forward, surely the clips would then be able to fit
__________________
ARC R11
Yokomo YRF001
AE B5m
ford_racing is offline   Reply With Quote
Old 06-08-2006, 08:33 PM   #15
Tech Regular
 
SammyXp's Avatar
 
Join Date: Mar 2004
Location: Winston Salem, NC
Posts: 428
Default

Quote:
Originally Posted by speedxl
omg Where have you been all my life! dude you need to make that fit 12 scale asap!!! aswell as the Porsche. I'm also curious how it would turn out for tourer aswell. I am tired of taxi cabs!!
Taxi cabs, haha. I love it. That's exactly how I see them. I thought they had an R8 for 12th scale, though? We'll see how this one goes and then I'll see where the demand is for other LMP or Group C cars.

XrayFK, what GT class are you thinking about?

vtl1180ny, if you're retired, you definitely ought to go back for your BSME. There is a major shortage of engineers. People just aren't interested in the sciences when there are so many easy ways to make money. I could so be making more money doing something else, but I probably wouldn't be having this much fun! Whenever I interview an RC guy for an engineering position, they get major points. Creativity and the willingness to embrace a challenge.

On the body posts, I was thinking of twisting them sideways so the clip would go in front to back.
SammyXp is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to have fun with Touring cars John Malin Florida Racing 15 08-23-2007 02:35 PM
wtb a touring cars nitro kid R/C Items: Wanted to Buy 2 04-02-2007 06:30 PM
Real cheap touring cars/ or offroad cars DriveToLive R/C Items: Wanted to Buy 7 12-04-2005 07:40 PM
touring cars and oval cars for sale or trade for offroad!!!!! gac1983 R/C Items: For Sale/Trade 1 03-03-2004 01:39 PM
Lots of 1/12, 1/10 Race Pan Cars, Touring Cars and More FS dynamic_e R/C Items: For Sale/Trade 10 07-22-2003 02:47 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 03:17 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net