R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 01-23-2007, 10:15 AM   #871
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

Joe-The car will hold two of these MaxAmps 4000 mA-h batteries side by side wired in parallel for a total of 8000mA-h. I think it will do a 20 minute main with two packs on board.

John
John Stranahan is offline   Reply With Quote
Old 01-23-2007, 10:21 AM   #872
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,214
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by John Stranahan
Joe-The car will hold two of these MaxAmps 4000 mA-h batteries side by side wired in parallel for a total of 8000mA-h. I think it will do a 20 minute main with two packs on board.

John
wow 20minutes!! are you racing them in the main with the nitro cars? how is the heat in the motor after 20minutes?
Marcos.J is offline   Reply With Quote
Old 01-23-2007, 10:23 AM   #873
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

I plan to race in the Nitro main one day. I have had an assortment of difficulties so far that have prevented me. We don't race very often, twice a month. Motor temps are never over 170 F, but its winter. We have stopped treating the track with sugar water. This lowers the motor temp even more.
John Stranahan is offline   Reply With Quote
Old 01-23-2007, 01:58 PM   #874
Tech Adept
 
ljohnson's Avatar
 
Join Date: Feb 2004
Location: Delta BC, Canada
Posts: 183
Default

Quote:
Originally Posted by John Stranahan
Joe-The car will hold two of these MaxAmps 4000 mA-h batteries side by side wired in parallel for a total of 8000mA-h. I think it will do a 20 minute main with two packs on board.
I wonder if your run time would be better if they where wired in series - ~14.8v 4000mah vs 7.4v 8000mah. You'd need different electronics though, A lower rpm/v motor and speed control + bec that can handle 14.8v. In theory at least, higher voltages are more efficient for a given power output due to less amp draw.
ljohnson is offline   Reply With Quote
Old 01-23-2007, 03:15 PM   #875
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

lJohnston-I posted the same thought previously on this thread. I have a new Tekin R1Pro esc on order that will handle the two batteries in series. There should be less amp draw and less heat produced. I will use a less powerful motor with more winds for the test. I am hoping the speed control will adjust the BEC voltage. This is not in the specs.

John
John Stranahan is offline   Reply With Quote
Old 01-23-2007, 03:21 PM   #876
Super Moderator
 
Marcos.J's Avatar
R/C Tech Elite Subscriber
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 27,214
Trader Rating: 182 (100%+)
Default

Quote:
Originally Posted by John Stranahan
lJohnston-I posted the same thought previously on this thread. I have a new Tekin R1Pro esc on order that will handle the two batteries in series. There should be less amp draw and less heat produced. I will use a less powerful motor with more winds for the test.

John
let me know how you like that tekin!
Marcos.J is offline   Reply With Quote
Old 01-23-2007, 06:01 PM   #877
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

MarcosJ-will do. It is not available yet as far as I know. It is backordered.

Here is a pic of the new double A-arm front suspension showing the recent changes. The upper shock mount ball is now attached to the upper A-arm hinge pin. This is a Traxas ST (2) kingpin. The picture also shows the slimmed down head of the IRS kingpin.

Caster
I have added a third spacer at the rear of this hingepin to increase caster slightly. This will kill a little turn in and add some midcorner steering traction. Because my outer A-arm vertical spacing is longer than stock, these washers have less effect on caster than on the stock suspension. This long spacing will provide more rigid camber support which I think is neccesary on the sweeper.

Roll Center
I have added one washer under the outer A-arm pivot. This raised the roll center slightly. This will reduce the front cornering traction slightly.

Shock Oil Weight
I have upped the shock oil to 35 weight. This will kill a little turn in.

Reactive Caster
Because I have used the arms and reactive caster blocks on the opposite side of the car than the one intended, the reactive caster blocks work in reverse and add caster late in the corner. This will not be a useful tuning aid.

New Brushless Motor, Ceramic Bearing, Source
I have some parts ordered from Murdock RC. A new part there is a ceramic brushless bearing set for $10. This is a significant savings on perhaps a better motor bearing. I have been looking for these. The endbell side will need to be installed with high temperature red locktite and pressed or hammered in with a suitable tool that bears on the outer race. The Novak part has the front bearing already installed in a new endbell.
Attached Thumbnails
Pantoura, 1/10 Pan Car, 2S LiPo, Brushless, Tips and Tricks.-front-suspension-prototype-f-002-resized.jpg  

Last edited by John Stranahan; 01-28-2007 at 02:15 PM.
John Stranahan is offline   Reply With Quote
Old 01-23-2007, 11:21 PM   #878
Tech Master
 
Marty Peterson's Avatar
R/C Tech Charter Subscriber
 
Join Date: Mar 2004
Posts: 1,777
Default

Hi John Great Job again Buddy!!!!!! Looks sweet!!!!!!

I have finished my GT2 Car and waiting for a servo and body to come in Then I will be working on this one next like you did.

Last edited by Marty Peterson; 08-03-2008 at 01:39 PM.
Marty Peterson is offline   Reply With Quote
Old 01-23-2007, 11:41 PM   #879
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,186
Default

Hey Marty looks nice! Only thing I'd suggest is move the body mounts back to the main chassis. On the pod the body is going to restrict pod movement. Also downforce is better applied to the chassis through the suspension to the wheels rather then directly on the wheels. F1 used to mount their wings to the wheel hubs too but moved it to the chassis once they figured that out.
InspGadgt is offline   Reply With Quote
Old 01-23-2007, 11:59 PM   #880
Tech Master
 
Marty Peterson's Avatar
R/C Tech Charter Subscriber
 
Join Date: Mar 2004
Posts: 1,777
Default

Thanks I am moving them to the main Chassis it was to test and see how long and high my body post plate needs to be.
Marty Peterson is offline   Reply With Quote
Old 01-24-2007, 12:20 AM   #881
SKJ
Tech Adept
 
Join Date: May 2002
Location: OC SoCal
Posts: 179
Trader Rating: 19 (100%+)
Default

Marty
That front end looks nice. When will it be put into production? Would like to try it on my velodrome car.

Steve
SKJ is offline   Reply With Quote
Old 01-24-2007, 01:52 AM   #882
Tech Master
 
Marty Peterson's Avatar
R/C Tech Charter Subscriber
 
Join Date: Mar 2004
Posts: 1,777
Default

Quote:
Originally Posted by SKJ
Marty
That front end looks nice. When will it be put into production? Would like to try it on my velodrome car.

Steve

What car are you running?

Can you drill the holes and countersink them?

If so I can make front end kits ready to ship when we re-open in mid to late Feb 2007

email me
Marty Peterson is offline   Reply With Quote
Old 01-24-2007, 09:40 AM   #883
Tech Champion
 
YR4Dude's Avatar
 
Join Date: Sep 2004
Location: So Cal
Posts: 5,625
Trader Rating: 44 (100%+)
Default

Marty-Nice looking car except what really would be interesting is a car that is the reverse of what you did. Instead, how about the same battery layout with a TC rear-end and a pancar frontend (reactive caster)? Also, instead of using the larger TC shocks on the rear, switch them for the AE Macroshocks.

Now that would be something I would be interested in getting from you. Thats unless I build it for myself first. However, I'm sure the quality of your work is better,
YR4Dude is offline   Reply With Quote
Old 01-24-2007, 10:13 AM   #884
Tech Elite
 
Join Date: Aug 2002
Location: Houston, Texas
Posts: 3,777
Trader Rating: 27 (100%+)
Send a message via AIM to John Stranahan
Default

Marty-Thanks. Nice looking front end on your GT2.
John

Pic is of my revised lower arm.
Attached Thumbnails
Pantoura, 1/10 Pan Car, 2S LiPo, Brushless, Tips and Tricks.-front-suspension-loweer-arm-resized.jpg  

Last edited by John Stranahan; 01-24-2007 at 10:23 AM.
John Stranahan is offline   Reply With Quote
Old 01-24-2007, 11:35 AM   #885
Tech Champion
 
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,186
Default

Quote:
Originally Posted by YR4Dude
Marty-Nice looking car except what really would be interesting is a car that is the reverse of what you did. Instead, how about the same battery layout with a TC rear-end and a pancar frontend (reactive caster)? Also, instead of using the larger TC shocks on the rear, switch them for the AE Macroshocks.

Now that would be something I would be interested in getting from you. Thats unless I build it for myself first. However, I'm sure the quality of your work is better,
Couple problems with that...first...there was an early gas conversion that did exactly that...used a Kyosho rear end on a pan chassis and front end. We had one at our hobby store and really had a hard time getting it to handle. Second it would be hard to find a class to run it in if you plan to race it.
InspGadgt is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Associated Factory Team TC5, Brushless, LiPo, Li-ion Nanophosphate, Tips and Tricks John Stranahan Electric On-Road 839 11-01-2011 04:31 PM
Xray T2R, 2100 mah 2c LiPo, and Mabuchi power: Tech tips and Tricks gacjr0 Electric On-Road 46 11-18-2007 10:09 AM
tips and tricks XXX-NT streetstock Electric Off-Road 2 05-13-2005 10:50 AM
Tips & Tricks Steevo Electric On-Road 54 08-08-2003 10:09 PM
Tips And Tricks rctc3 Electric On-Road 36 03-10-2002 10:54 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 10:56 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