R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 07-16-2008, 08:55 AM   #76
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

Does the 2nd guy on the right have his eyes closed? That must be another speed secret.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Old 07-16-2008, 09:11 AM   #77
Tech Master
 
TeamB&B's Avatar
 
Join Date: May 2007
Location: Maryland
Posts: 1,177
Trader Rating: 5 (100%+)
Default

...figure a way out to make you radio glitch before every straightway.

Ever notice how a stock car smashes into the wall at mod speeds after a radio glitch.
__________________
RCAmerica / Sweep
TeamB&B is offline   Reply With Quote
Old 07-16-2008, 09:33 AM   #78
Tech Champion
 
John Tag's Avatar
 
Join Date: May 2004
Location: Huntersville, NC
Posts: 8,925
Trader Rating: 42 (100%+)
Default

Best way I have found to gain .5 to sec a lap.. Let Jason Schreffler or Larry Fairtrace wheel my car.....
__________________
www.express-motorsports.net for all your motor needs
Multi time National Champions,Reedy Champs,Vegas Champs,Birds, Champs,[email protected]

Team Associated-Express Motorsports-Trinity-Reflex Racing-A Main Hobbies-ProtekRC
John Tag is offline   Reply With Quote
Old 07-16-2008, 09:50 AM   #79
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by John Tag View Post
Best way I have found to gain .5 to sec a lap.. Let Jason Schreffler or Larry Fairtrace wheel my car.....
What do you do if they are both in the same heat as you?

Also, why is everyone looking to drop a second a lap of their own time? It may be easier to figure out how to get everyone else to slow down by a second per lap. Lead wheel weights, anyone? Gotta increase that rotational mass.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 07-16-2008, 10:09 AM   #80
Suspended
 
Join Date: Jun 2008
Posts: 592
Trader Rating: 1 (100%+)
Default

I know this is old-school, but what about those antenna frequency ribbons ????

They gotta be worth something...
rocket-mtrsprts is offline   Reply With Quote
Old 07-16-2008, 12:49 PM   #81
Tech Fanatic
 
trailranger's Avatar
 
Join Date: Feb 2007
Location: Springfield, MO
Posts: 946
Default

If you run Brushless stock you need a TriToroidalTransPotentialEsclator...That is worth more than a second a lap.

I would post the pics..of the device..but then everyone would build one. Ok...I could be talked into posting the pics if I get few paypal donations. Don't worry I dont work for Hamas.
trailranger is offline   Reply With Quote
Old 07-16-2008, 01:39 PM   #82
Tech Addict
 
Bigshades's Avatar
 
Join Date: Nov 2007
Location: Texas
Posts: 582
Trader Rating: 22 (96%+)
Default

How about placing a HUGE sheet of Iron below the tracks, and then placing Sintered magnets on your car... TONS of downforce @ 0MPH!!!
Bigshades is offline   Reply With Quote
Old 07-16-2008, 04:00 PM   #83
Tech Fanatic
 
trailranger's Avatar
 
Join Date: Feb 2007
Location: Springfield, MO
Posts: 946
Default

Quote:
Originally Posted by Bigshades View Post
How about placing a HUGE sheet of Iron below the tracks, and then placing Sintered magnets on your car... TONS of downforce @ 0MPH!!!
Isn't that how some slot cars work? steel rails and magnets to keep them from slinging off the track.
trailranger is offline   Reply With Quote
Old 10-11-2008, 03:21 AM   #84
Tech Regular
 
kavadni's Avatar
 
Join Date: Aug 2007
Location: Perth, WA
Posts: 328
Trader Rating: 1 (100%+)
Default

DC-DC step up circuitry disguised - mounted in a Power Cap.

Sssh this is very secret stuff.
kavadni is offline   Reply With Quote
Old 10-11-2008, 12:05 PM   #85
Tech Adept
 
360rcspeedway's Avatar
 
Join Date: Nov 2007
Posts: 131
Default

Mount the transponder in the front bumper..worth .3 a lap
360rcspeedway is offline   Reply With Quote
Old 10-11-2008, 01:53 PM   #86
Tech Fanatic
 
trailranger's Avatar
 
Join Date: Feb 2007
Location: Springfield, MO
Posts: 946
Default

Quote:
Originally Posted by kavadni View Post
DC-DC step up circuitry disguised - mounted in a Power Cap.

Sssh this is very secret stuff.
Accutally....

Using a Maximum Power Point Tracker (MPPT) that has a built in DC-DC step/up or down converter will give the most performance.

My Solar R/C Car uses a MPPT and it is well worth 3 seconds a lap over just strait solar panel connection. This technology could be applied to regular R/C Cars.

It may be a complicated thing to explain, but I will try.
Solar Panels have a very narrow Maximum Power Point. The maximum power point is pretty much this. Any load less than that point and the solar panels are not being fully used. Any load higher than that point voltage drop will be so great that the actual power is less. The Maximum Power piont could be also called a point of diminishing returns for total power output. Batteries also have a Maximup Power Point. This is why some batteries are rated 10C, 20C and even 28C. When the load becomes so great the battery simply fails to produce as much total power as with a lighter load. The higher the MPP, the better the punch is for a battery.

My solar panel in 100% insolation (100% sunlight) can produce 9.9V without a load and a maximum dead short load of 3.6A. The problem is that at 3.6A my voltage is only 3V or about 10watts total power. This radical reduction in voltage and power normally happens when I give the car hard acceleration and my radio and esc will then turn off from lack of voltage.

According to test, my MPP for my solar panel is 3amps and the voltage is 8.4V producing 25 watts. 25 watts is 250% more power than 10watts at a dead short. With out the use of a MPPT, I have to gently apply throttle to the car to keep the amps under 3 or the car will stall and the Radio System will turn off from not enough voltage.

With a MPPT I can apply full throttle and no matter how great the load, the MPPT will always keep the load seen by the solar panel at 3amps. The added bonus to the MPPT is DC-DC conversion. The MPPT senses the increased load and coverts my 8.4V @ 3A into 2V @ 12A during the hard start to get the car to accelerate faster than without the MPPT. As the load decreases the MPPT is constantly bringing the voltage up to increase the motor speed.

Some of the older brushed ESC's had a simple version of a MPPT. The manufactures called this traction/punch control. Back in the day when batteries were only 1500 to 1800 preventing wasted current was a sure way to be the fastest and last man going at the end of a race. The punch control didn't use complicated algorithms to solve where the MPPT was, it just use a dial potentiometer to adjust the max current. The punch control was pretty much set by trail and error by the racer. On my MPPT I just hook some resistors and push the set button. After about 2 seconds, the power source is mapped and the MPPT point is chosen. Now days punch control is really only used when traction is an issue, not because batteries will dump. Two weeks ago, I entered a 500lap run-till it stops enduro. I I used punch control to limit wasted current and yes it worked as I and one other racer were able to complete over 400 laps before our 4-cell 4600's dumped.

Last edited by trailranger; 10-11-2008 at 02:31 PM.
trailranger is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
STUFF FOR SALE """"LQQK """" EZRC R/C Items: For Sale/Trade 1 03-13-2007 07:20 PM
"""NEW""" Collari .21 3 port buggy motor lc21-b3 goneRVing R/C Items: For Sale/Trade 7 12-20-2006 06:25 PM
STUFF FOR SALE """"LQQK """" EZRC R/C Items: For Sale/Trade 11 10-22-2006 09:49 PM
""" XRAY FK05 """ excellent cond/super clean/stock evostyle R/C Items: For Sale/Trade 9 06-29-2006 10:04 PM
Huge "Clearing Out Maxx Parts" Sale (Worth a Look) stil2hi95 R/C Items: For Sale/Trade 14 06-02-2005 10:10 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 01:11 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