R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 10-21-2005, 06:53 AM   #8446
Tech Elite
 
W.E.D.Jim's Avatar
 
Join Date: Oct 2001
Location: Kissimmee,Fl.
Posts: 4,927
Trader Rating: 17 (95%+)
Send a message via AIM to W.E.D.Jim
Default

Weliin, the Parma Alfa is said to be the best carpet body. But I heard something interesting on "SPEED" a few weeks ago.

A Nascar race at a 1.45 mile track where one of the leaders got caught in a collision and bent a front fender pretty badly, it was all twisted up and out over the front tire on the left side. The crew bent it back a little, so it at least wasn't sticking out.
What was interesting was what the announcers said about it. One asked about the effect the damage would have on the Aero package they spend so much time testing in wind tunnels to perfect. The other replied that since average lap speeds at that track are "only 124 mph" it wouldn't be much of a factor in the race.

Kinda makes you wonder how much of an aero difference there is between a Losi Alfa and Parma Alfa at an average lap speed of 15 mph? I think what we feel on the track may be more due to overall hieght and weight distribution of the body over the car, especially since half of any aero package involves the underside, which is open on our R/C cars.....jmo......, Jim
__________________
www.wedjim.com ...Reopening soon. I'm still painting, just not with 40+ bodies waiting. :)
www.prolineracing.com
www.HarleyDavidson.com
"Nothing but the best!"
W.E.D.Jim is offline   Reply With Quote
Old 10-21-2005, 08:39 AM   #8447
Tech Master
 
Join Date: Dec 2003
Location: San Diego, Ca.
Posts: 1,024
Trader Rating: 29 (100%+)
Default

but if you relate 15 to 1/10 scale that would be 150, and the full size weight to scale weight is totally different to, so aero might actually come into more effect, than it does on a cup car........
Mdoc is offline   Reply With Quote
Old 10-21-2005, 08:55 AM   #8448
Tech Apprentice
 
weliin's Avatar
 
Join Date: Oct 2005
Location: Gnomeregan
Posts: 86
Default

Quote:
Originally Posted by W.E.D.Jim
Weliin, the Parma Alfa is said to be the best carpet body. But I heard something interesting on "SPEED" a few weeks ago.

A Nascar race at a 1.45 mile track where one of the leaders got caught in a collision and bent a front fender pretty badly, it was all twisted up and out over the front tire on the left side. The crew bent it back a little, so it at least wasn't sticking out.
What was interesting was what the announcers said about it. One asked about the effect the damage would have on the Aero package they spend so much time testing in wind tunnels to perfect. The other replied that since average lap speeds at that track are "only 124 mph" it wouldn't be much of a factor in the race.

Kinda makes you wonder how much of an aero difference there is between a Losi Alfa and Parma Alfa at an average lap speed of 15 mph? I think what we feel on the track may be more due to overall hieght and weight distribution of the body over the car, especially since half of any aero package involves the underside, which is open on our R/C cars.....jmo......, Jim
I would attend to agree with you. Not sure if they are still using them but back in the early 90s on the high speed ovals the oval guys was using under bodies.
weliin is offline   Reply With Quote
Old 10-21-2005, 08:58 AM   #8449
Tech Adept
 
Join Date: Nov 2004
Location: newbarn kent england
Posts: 100
Default

Quote:
Originally Posted by Mdoc
but if you relate 15 to 1/10 scale that would be 150, and the full size weight to scale weight is totally different to, so aero might actually come into more effect, than it does on a cup car........
Yes but your not increasing the air density by x10
losiboys is offline   Reply With Quote
Old 10-21-2005, 09:02 AM   #8450
Tech Master
 
Rob Phillips's Avatar
 
Join Date: Nov 2004
Location: Indianapolis / VA
Posts: 1,722
Trader Rating: 6 (100%+)
Default

I have been considering testing out an under body to see what the effects would be. I know that the turbulent air flow created under the car is not helping. I just need to find a piece of lexan.
__________________
Team Durango | TrakPower | DE Racing | Futaba | Restricted Paint Worx

Velocity R/C Magazine - vrcmag.com
Rob Phillips is offline   Reply With Quote
Old 10-21-2005, 09:46 AM   #8451
Tech Master
 
Join Date: Dec 2003
Location: San Diego, Ca.
Posts: 1,024
Trader Rating: 29 (100%+)
Default

Quote:
Originally Posted by losiboys
Yes but your not increasing the air density by x10

exactly...if the air density was increased then the aero wouldnt be as important for down force
Mdoc is offline   Reply With Quote
Old 10-21-2005, 11:02 AM   #8452
wyd
Tech Legend
 
wyd's Avatar
 
Join Date: Sep 2001
Location: Castle Mamba Max Pro. Feel its power!!!!!!!!!!
Posts: 21,141
Trader Rating: 50 (100%+)
Send a message via AIM to wyd
Default

Going to practice with my JRXS in an hour or so. Was wondering how much different the handling is from the box stock setup to the Meuman setup on asphalt? I bought the car used and it has the Neuman setup on it already but just checking to see if anyone has ran both setups with rubber tires on apshalt.
__________________
Castle Creations (Since 2005) Just awesome products
Bumps & Jumps RC (Great Indoor facility for offroad and oval)
ST Racing Concepts (STRC)
Custom Works (Best Oval Cars around)
wyd is offline   Reply With Quote
Old 10-21-2005, 11:06 AM   #8453
The Evicerator
R/C Tech Elite Subscriber
 
Join Date: Sep 2001
Location: Irvine, CA
Posts: 4,142
Default

I would say stick with the numan setup... it is further up the evolutionary chain than the kit setup
__________________
Steve Weiss
TEAM ASSOCIATED -- REEDY -- SANWA -- PROTOFORM -- 1UP Racing -- ActivRC -- P1 BRAND -- TEAM KINWALD -- TEAM STEVE INTERNATIONAL
Steve Weiss is offline   Reply With Quote
Old 10-21-2005, 04:32 PM   #8454
Tech Master
 
Dasupacat1's Avatar
 
Join Date: Aug 2005
Location: Fort Wayne, IN
Posts: 1,372
Trader Rating: 25 (96%+)
Send a message via MSN to Dasupacat1
Default

Quote:
Originally Posted by Yeti35
Try the Numan setup, that is what I used in LV at IIC. Only thing I did not use was the spool, just ran a diff up front. It will give you some place to start at least.
Ok. It's worth a try. I tried the kit setup. All i did was go 50# front & 20# in rear springs along with the sway bar in rear. Didn't have enough off power turn in and rear slid out on exit.
Dasupacat1 is offline   Reply With Quote
Old 10-21-2005, 04:44 PM   #8455
Tech Master
 
Timmy_G's Avatar
 
Join Date: Mar 2004
Location: Adelaide
Posts: 1,193
Trader Rating: 1 (100%+)
Send a message via MSN to Timmy_G
Default

The rubber "o rings" on the one way outdrives...what benefit do they have?

thanks
Tim
__________________
Losi, JR Propo ,Spektrum, Novarossi, AT Racing Fuels
Timmy_G is offline   Reply With Quote
Old 10-21-2005, 05:19 PM   #8456
Tech Elite
 
W.E.D.Jim's Avatar
 
Join Date: Oct 2001
Location: Kissimmee,Fl.
Posts: 4,927
Trader Rating: 17 (95%+)
Send a message via AIM to W.E.D.Jim
Default

MDoc, scale speed and things in scale are usually not true, and definatly not linear, since speed can't be measured in scale, just like aerodynamics. 15 mph is 15 mph when it comes to aero. The air isn't worried about the size of a wing, or car body, or car.

Underpans are illegal according to ROAR rules.......Not to mention the heat factor in modified sedan, which already use fans top keep the wires and brushes on the endbell.

I've been working on a way to test aero more effectively on our cars, but it is proving costly and difficult to measure at such slow speed. In most turns when people say they get more steering from a certain body in 180's the car is down under 6 or even 5 mph. I haven't given up yet though.......hmmmmm, Jim
__________________
www.wedjim.com ...Reopening soon. I'm still painting, just not with 40+ bodies waiting. :)
www.prolineracing.com
www.HarleyDavidson.com
"Nothing but the best!"
W.E.D.Jim is offline   Reply With Quote
Old 10-21-2005, 05:24 PM   #8457
Tech Champion
 
geeunit1014's Avatar
 
Join Date: Sep 2005
Location: The dirty burnie
Posts: 5,505
Trader Rating: 12 (100%+)
Default

if the air isnt worried about the size of the wing or body shape, then why do bodies have such a big effect on the handling of the car?
and if speed cant be measured in scale, then who came up with scale speed
__________________
Mike Gee

Awesomatix USA/Pyscho Cells Racing/Tekin/Sweep Racing/RSD/180 Raceway/Johns Mobile Raceway/TQ Wire/Avid/Sanwa
geeunit1014 is offline   Reply With Quote
Old 10-21-2005, 05:45 PM   #8458
Tech Master
 
Join Date: Dec 2003
Location: San Diego, Ca.
Posts: 1,024
Trader Rating: 29 (100%+)
Default

size and weight have everything to do with changes in aero, weld a nascar body together with no car under it, and put it on the ground....blow 10 mile an hr wind on it....nothing would happen.....do the same with an rc body....

tires on an rc, or anything for that matter, use friction to turn or move the car....different bodies change the amount of friction the tire has to use by changing the amount of downforce it has on the tires, no an rc car doesnt get as much downforce as a cup car...but it also dosent have the same power to control or the same amount of weight to make change directions....run 20 timed laps with a well trimed body on an average track....then take the body off and try 20 more.......
Mdoc is offline   Reply With Quote
Old 10-21-2005, 05:47 PM   #8459
Tech Master
 
Join Date: Oct 2002
Location: Toronto
Posts: 1,300
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by Timmy_G
The rubber "o rings" on the one way outdrives...what benefit do they have?

thanks
Tim
They hold the bearing's in ... I tried running without them once - what a mess - I suggest you run them.
duckman996 is offline   Reply With Quote
Old 10-21-2005, 06:11 PM   #8460
Tech Elite
 
Join Date: Oct 2003
Location: Green Bay,WI
Posts: 3,006
Trader Rating: 1 (100%+)
Send a message via AIM to R/C Anonymous
Default

i never noticed a HUGE difference between bodies in handling....i guess i dont know how to race these things
R/C Anonymous is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Team Losi JRXS Fast XXXS Australia For Sale/Trade 6 11-19-2007 03:34 PM
F-S Team losi JRXS as new mcskoda Australia For Sale/Trade 6 10-31-2006 02:15 AM
FS:Team Losi JRXS BiggAlz R/C Items: For Sale/Trade 21 03-25-2006 05:47 PM
Team Losi JRXS FS JRXSBear R/C Items: For Sale/Trade 9 01-19-2006 03:57 PM
Team Losi JRXS Jon Carlson R/C Items: For Sale/Trade 3 01-18-2006 08:28 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 01:43 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net