R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 03-26-2009, 02:05 PM   #496
Tech Regular
 
Join Date: Feb 2006
Location: Netherlands
Posts: 478
Send a message via MSN to PMSorber
Default

Quote:
Originally Posted by C Verano View Post
I have never ran the body witout raising it but even raised I had good steering with it.

The raised body generates a diffuser effect and thereby more steering and overall downforce.
__________________
@ConSult Trading
Team Shepherd, PiraniRC, Sonic and Awesomatix BENELUX
www.team-shepherd.nl
PMSorber is offline   Reply With Quote
Old 03-27-2009, 05:28 AM   #497
Tech Regular
 
Join Date: Aug 2005
Posts: 480
Trader Rating: 2 (100%+)
Default

Quote:
Originally Posted by PMSorber View Post
The raised body generates a diffuser effect and thereby more steering and overall downforce.
But, Am I right to say that it also compromises the straight line speed?
backplate is offline   Reply With Quote
Old 03-27-2009, 07:39 AM   #498
Tech Regular
 
Join Date: Feb 2006
Location: Netherlands
Posts: 478
Send a message via MSN to PMSorber
Default

Quote:
Originally Posted by backplate View Post
But, Am I right to say that it also compromises the straight line speed?
A bit, we never noticed a big difference in topspeed. On the other side, topspeed is not important on a technical track.
__________________
@ConSult Trading
Team Shepherd, PiraniRC, Sonic and Awesomatix BENELUX
www.team-shepherd.nl
PMSorber is offline   Reply With Quote
Old 03-27-2009, 09:32 AM   #499
Tech Elite
 
HarryN's Avatar
 
Join Date: Jan 2009
Location: Maryland, USA
Posts: 2,009
Trader Rating: 2 (100%+)
Send a message via AIM to HarryN
Default

Quote:
Originally Posted by PMSorber View Post
The raised body generates a diffuser effect and thereby more steering and overall downforce.
I'm sorry to hijack this thread as it is about the Shephard, but how is raising the body in the rear able to create downforce for more steering? I would assume you would need more downforce in the front to help the front tires grip tighter and provide more steering.

Am I missing something here?
__________________
Car(s): Team Losi 22 1/10 Buggy, Team Losi 22 1/10 Stadium Truck
Motors/Engines: SP 13.5 v1.0, SP 17.5 v3.0 x2, RevTech 7.5
Radio: Spektrum DX3R, DX3S
Cars For Sale: FG 08-530 EVO w/ Sport Brakes!
Track(s): http://www.rctrack.com
HarryN is offline   Reply With Quote
Old 03-27-2009, 11:36 AM   #500
Tech Master
 
Josh Cyrul's Avatar
 
Join Date: Sep 2003
Location: Farmington Hills, Michigan
Posts: 1,409
Default

Harry - By raising the rear of the body you actually increase the angle of attack on the entire body, front is steeper, center, etc... It's not just raising the rear putting it higher into the air. It ends up moving the pressure center farther forward, thus more steering. Also, you raise the CG of the body more in the rear than the front which can cause it to lean and swing more generating more steering. Lower bite, more technical tracks we raise the rear and higher bite, more flowing tracks we lower the rear. I've never really noticed a top speed difference from raising/lowering the body but I've slightly noticed it from the trim strip size/height.
__________________
Destiny, Ko Propo, Hobby Wing, Ulti Racing Tires, Protoform, Xenon Racing, Pivothead, Vizon, TQ Wire & Hella Graphics
Josh Cyrul is offline   Reply With Quote
Old 03-27-2009, 11:41 AM   #501
Tech Elite
 
HarryN's Avatar
 
Join Date: Jan 2009
Location: Maryland, USA
Posts: 2,009
Trader Rating: 2 (100%+)
Send a message via AIM to HarryN
Default

Quote:
Originally Posted by Josh Cyrul View Post
Harry - By raising the rear of the body you actually increase the angle of attack on the entire body, front is steeper, center, etc... It's not just raising the rear putting it higher into the air. It ends up moving the pressure center farther forward, thus more steering. Also, you raise the CG of the body more in the rear than the front which can cause it to lean and swing more generating more steering. Lower bite, more technical tracks we raise the rear and higher bite, more flowing tracks we lower the rear. I've never really noticed a top speed difference from raising/lowering the body but I've slightly noticed it from the trim strip size/height.
Huh, interestingly enough, it made perfect sense. However, the last question I have is, why do some people to stick an extra piece of Lexan at the rear when going for the same results? Basically they raise the rear tail to it captures more air. Are they going for more rear traction in this case? I know it sounds stupid, but I have always thought a higher nose or a body pushed foreward creates more downforce for the front, thus creating more grip and steering. By raising the rear, like you said, it is sacrificing a lower CG.
__________________
Car(s): Team Losi 22 1/10 Buggy, Team Losi 22 1/10 Stadium Truck
Motors/Engines: SP 13.5 v1.0, SP 17.5 v3.0 x2, RevTech 7.5
Radio: Spektrum DX3R, DX3S
Cars For Sale: FG 08-530 EVO w/ Sport Brakes!
Track(s): http://www.rctrack.com

Last edited by HarryN; 03-27-2009 at 12:51 PM.
HarryN is offline   Reply With Quote
Old 03-27-2009, 02:50 PM   #502
Tech Regular
 
Join Date: Feb 2006
Location: Netherlands
Posts: 478
Send a message via MSN to PMSorber
Default

Quote:
Originally Posted by HarryN View Post
Huh, interestingly enough, it made perfect sense. However, the last question I have is, why do some people to stick an extra piece of Lexan at the rear when going for the same results? Basically they raise the rear tail to it captures more air. Are they going for more rear traction in this case? I know it sounds stupid, but I have always thought a higher nose or a body pushed foreward creates more downforce for the front, thus creating more grip and steering. By raising the rear, like you said, it is sacrificing a lower CG.
That extra piece of lexan also has an other purpose, it prohibits disforming of the body at the rear bodymount. CG is important but sometimes helps with a better stability in corners due to raising or lowering.
__________________
@ConSult Trading
Team Shepherd, PiraniRC, Sonic and Awesomatix BENELUX
www.team-shepherd.nl
PMSorber is offline   Reply With Quote
Old 03-28-2009, 04:51 AM   #503
Tech Rookie
 
Join Date: Mar 2009
Posts: 3
Default

Quick question please,

I am considering a Sheperd Velox, what type of wheel fit this car?

Will the xceed tyres fit ok?
JustinZac is offline   Reply With Quote
Old 03-28-2009, 05:18 AM   #504
Tech Regular
 
Join Date: Feb 2006
Location: Netherlands
Posts: 478
Send a message via MSN to PMSorber
Default

Quote:
Originally Posted by JustinZac View Post
Quick question please,

I am considering a Sheperd Velox, what type of wheel fit this car?

Will the xceed tyres fit ok?
All but Serpent. Xceed will only fit if it's Offset-2 (Mugen offset).
__________________
@ConSult Trading
Team Shepherd, PiraniRC, Sonic and Awesomatix BENELUX
www.team-shepherd.nl
PMSorber is offline   Reply With Quote
Old 03-28-2009, 09:23 PM   #505
Tech Regular
 
sm1nts2escape's Avatar
 
Join Date: Jul 2006
Location: MD
Posts: 444
Trader Rating: 16 (100%+)
Default

Thanks for that little bit of knowledge josh.Makes alot of sense and very usefull.
sm1nts2escape is offline   Reply With Quote
Old 03-30-2009, 10:40 AM   #506
Tech Apprentice
 
AddictedToRacin's Avatar
 
Join Date: Mar 2007
Location: Freiberg, Germany
Posts: 76
Default

Can anyone tell me what parts are included in the 900002 conversion set?
AddictedToRacin is offline   Reply With Quote
Old 03-30-2009, 03:02 PM   #507
Tech Master
 
Josh Cyrul's Avatar
 
Join Date: Sep 2003
Location: Farmington Hills, Michigan
Posts: 1,409
Default

Addicted - '09 Chassis, '09 front and rear uprights w/long pivot balls (4), LCG rear bulkheads, 30g front chassis weight, carbon fiber rear shock mounts and '08 Euro rear hinge pin mounts.
__________________
Destiny, Ko Propo, Hobby Wing, Ulti Racing Tires, Protoform, Xenon Racing, Pivothead, Vizon, TQ Wire & Hella Graphics
Josh Cyrul is offline   Reply With Quote
Old 03-31-2009, 03:35 AM   #508
Tech Apprentice
 
AddictedToRacin's Avatar
 
Join Date: Mar 2007
Location: Freiberg, Germany
Posts: 76
Default

thx
AddictedToRacin is offline   Reply With Quote
Old 03-31-2009, 09:17 PM   #509
Tech Regular
 
Join Date: Sep 2002
Posts: 396
Default

Quote:
Originally Posted by Josh Cyrul View Post
Harry - By raising the rear of the body you actually increase the angle of attack on the entire body, front is steeper, center, etc... It's not just raising the rear putting it higher into the air. It ends up moving the pressure center farther forward, thus more steering. Also, you raise the CG of the body more in the rear than the front which can cause it to lean and swing more generating more steering. Lower bite, more technical tracks we raise the rear and higher bite, more flowing tracks we lower the rear. I've never really noticed a top speed difference from raising/lowering the body but I've slightly noticed it from the trim strip size/height.

To add to what Josh said.

A couple of years ago I was involved in some full size car testing where we removed the rear spoiler and added a rear wing. You can probably figure out what kind of cars were being tested by the wing part.

We took the spoiler off and added a wing, when that was done the aero balance shifted almost 20% to the rear. The reason is because the negative pressure at the rear of the car was reduced by removing the spoiler. The higher rear negative pressure (with a spoiler) actually pulls more air from under the car which adds front downforce.

A 1/8th scale body does the same thing for two reasons, one is the rear negative pressure effect from the body acting like a spoiler and the other is more area for air to get out. You would think sticking that big thing up in the air would add rear but it adds more front by actually sucking the air out from under the car with the higher negative pressure at the rear and shifts the balance forward like Josh said above. The total is higher as well.

Long story but it was cool to see how all the aero stuff works. And how it does the exact same thing on R/C cars.
Ted Flack is offline   Reply With Quote
Old 03-31-2009, 11:43 PM   #510
Tech Champion
 
asw7576's Avatar
 
Join Date: Sep 2004
Posts: 5,792
Default

Is it possible that too much rear downforce could result in understeering car ?
__________________
On Road : Xray NT1 , RX8 , T4 || Mugen Seiki MRX4-R , MTX4 , MTX3 prospec || Tamiya M03 , M04 || Top Racing Sabre FD2
Off Road : Xray XT8 || Hobao Hyper 8
Radio : Futaba 3PKS || KO propo EX-10 eurus
asw7576 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
ACADEMY VELOX XT15S PerformanceRC Electric Off-Road 2 05-25-2010 02:48 PM
Team Shepperd Racing SPEED V2& Velox DirtRacer Nitro On-Road 2 11-16-2007 05:37 AM



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 08:42 AM.


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