R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 11-15-2010, 05:51 AM   #1
Tech Master
 
Mark506's Avatar
 
Join Date: Nov 2008
Location: Latrobe, PA
Posts: 1,086
Trader Rating: 42 (100%+)
Default Gear Diffs In 1/12 Scales

Why not join the club? Discuss.
__________________
Mark Ament

l MOMO USA l OZ Racing l Willwood Brakes | Dunlop Tires |

The Raceway at Beaver: Forever In Blue Jeans
Mark506 is offline   Reply With Quote
Old 11-15-2010, 06:22 AM   #2
Tech Master
 
Pablo Diablo's Avatar
 
Join Date: Dec 2008
Location: Sydney Australia
Posts: 1,005
Trader Rating: 2 (100%+)
Send a message via Skype™ to Pablo Diablo
Default

The old Tamiya 1/12ths had them. They were an open design that offered no limited slip. At the time a ball diff was the trick option to have! To have a closed in diff with silicon oil would be an intricate design.
__________________
Paul H

Losi Type R | Xray T3 | CRC Gen XL | CRC Gen X 10 ME(Messiah Edition) | Black Diamond

www.FlyingFoxRC.com | Advanced Electronics | Team CRC | Factory Messiah
Pablo Diablo is offline   Reply With Quote
Old 11-15-2010, 07:18 AM   #3
Tech Master
 
Join Date: Oct 2002
Location: Toronto
Posts: 1,300
Trader Rating: 13 (100%+)
Default

Quote:
Originally Posted by Pablo Diablo View Post
The old Tamiya 1/12ths had them. They were an open design that offered no limited slip. At the time a ball diff was the trick option to have! To have a closed in diff with silicon oil would be an intricate design.
.... and pretty heavy. With the diff off to one side of the axle, this weight issue may cause set-up problems if you would like a sealed-diff design.
duckman996 is offline   Reply With Quote
Old 11-15-2010, 09:03 AM   #4
Tech Master
 
jag88's Avatar
 
Join Date: Nov 2003
Posts: 1,075
Trader Rating: 1 (100%+)
Default

There was a 1/12 gear diff back in the 80's made by Delta (?). It was quite fragile but was really trick for its time.
jag88 is offline   Reply With Quote
Old 11-15-2010, 11:46 AM   #5
Tech Elite
 
Rick Hohwart's Avatar
 
Join Date: Sep 2003
Posts: 3,935
Default

Quote:
Originally Posted by jag88 View Post
There was a 1/12 gear diff back in the 80's made by Delta (?). It was quite fragile but was really trick for its time.
Yes it was Delta. I used this a little bit but it was very fragile. Gears would break pretty easily. However it did work well when it worked. With today's better materials and increased traction on carpet surfaces with better tires, it would probably work better than back in the '80s. I don't necessarily think a gear diff would need to be sealed for it to work properly.
Rick Hohwart is offline   Reply With Quote
Old 11-17-2010, 01:22 PM   #6
Tech Fanatic
 
Join Date: Jun 2005
Posts: 900
Default

I agree with Rick, if a good designer combined modern materials with modern manufacturing techniques, a geared diff at minimum weight penalty would be possible. As long as there was something to keep the dust and dirt out, sealing is not neccessary. Correct material selection for the gears should enable the gears to run with a good teflon dry lube.

As a ball diff is so easy to keep maintained and set these days, I am not sure that a geared diff has a market in this class, and it would have disadvantages, like backlash, over a ball diff.
SlowerOne is offline   Reply With Quote
Old 11-26-2010, 04:10 PM   #7
Tech Elite
 
Bob-Stormer's Avatar
 
Join Date: Dec 2001
Location: Glasgow, Montana USA
Posts: 3,518
Trader Rating: 8 (100%+)
Default

I ran them back in the day a few times. As I recall they added a lot of chatter to the car compared to a ball diff. Was fun to have those options, work or not.
__________________
www.stormerhobbies.com "Where the world shops for radio control."
www.facebook.com/stormerhobbies
www.twitter.com/stormerhobbies

looking for....vintage 1/10-1/12 pan, need Schumacher 1/12th cars and parts.
Bob-Stormer is offline   Reply With Quote
Old 11-26-2010, 08:48 PM   #8
Tech Elite
 
nashrcracer's Avatar
R/C Tech Charter Subscriber
 
Join Date: Nov 2001
Location: LA - Lower Antioch
Posts: 4,911
Trader Rating: 1 (100%+)
Default

you mean like this Tamiya 956 porsche I own...



__________________
RC50 As you come into this world, something else is also born. You begin your life, and it begins a journey towards you. It moves slowly, but it never stops. Wherever you go, whatever path you take, it will follow never faster, never slower, always coming. You will run, it will walk. You will rest, it will not. One day, you will linger in the same place too long you will sit too still, or sleep too deep. And when, too late, you rise to go, you will notice a second shadow next to yours. Your life will then be over.
nashrcracer is offline   Reply With Quote
Old 11-26-2010, 09:18 PM   #9
Tech Elite
 
Bob-Stormer's Avatar
 
Join Date: Dec 2001
Location: Glasgow, Montana USA
Posts: 3,518
Trader Rating: 8 (100%+)
Default

This ought to be in some archive. I went and dug out a few Delta gear diffs, and snapped a few pics. including the instructions from 1983-1984.







__________________
www.stormerhobbies.com "Where the world shops for radio control."
www.facebook.com/stormerhobbies
www.twitter.com/stormerhobbies

looking for....vintage 1/10-1/12 pan, need Schumacher 1/12th cars and parts.
Bob-Stormer is offline   Reply With Quote
Old 11-26-2010, 11:04 PM   #10
Tech Elite
 
Johnny Wishbone's Avatar
 
Join Date: Feb 2006
Posts: 3,419
Trader Rating: 6 (100%+)
Default

The teeth on those where very brittle, once they where ruined we would lathe the teeth of the center section and then machine the proper size hole into a Kimbro gear, put the two togeather and glue them. This way we had a much more durable gear. The only bad part about running one of these was this was during the solid t-bar times, so there wasn't a whole lot of flex going on so a lot of times the car would unload the lite wheel in hard corners and then spool up and snap the car around.
__________________
Gary Lanzer
Johnny Wishbone is offline   Reply With Quote
Old 11-27-2010, 06:48 AM   #11
Tech Elite
 
j.d.roost's Avatar
 
Join Date: Jul 2008
Posts: 3,087
Trader Rating: 28 (100%+)
Default

This ought to be in some archive. I went and dug out a few Delta gear diffs, and snapped a few pics. including the instructions from 1983-1984.


I wonder what other vintage gems Bob has stashed away.
I am betting there is a bunch really cool stuff.
j.d.roost is offline   Reply With Quote
Old 11-27-2010, 08:56 AM   #12
Tech Elite
 
mxrich's Avatar
 
Join Date: Dec 2004
Location: N. GA.
Posts: 4,426
Trader Rating: 1 (100%+)
Default

Nash I need those gears, The road wizard has not made a lap in years!
__________________
I park faster than most people drive.
mxrich is offline   Reply With Quote
Old 11-27-2010, 11:25 AM   #13
Tech Elite
 
Pro10noob's Avatar
 
Join Date: Apr 2009
Location: The Netherlands
Posts: 2,117
Trader Rating: 13 (100%+)
Default

I ran that car back in the days and won 3 club championships with it against the wide 1:12 cars with the 27turns stock motors in them.
Now that was a blast

regards Roy


Quote:
Originally Posted by nashrcracer View Post
you mean like this Tamiya 956 porsche I own...



__________________
l===/o\===l
[_]-###-[_] V-link proto type Pro10,JKMR P235-SE Pro10
P235-VL Pro10 comming soon
Sponsered by me,myself and i :)
Pro10noob is offline   Reply With Quote
Old 11-27-2010, 08:18 PM   #14
Tech Elite
 
Bob-Stormer's Avatar
 
Join Date: Dec 2001
Location: Glasgow, Montana USA
Posts: 3,518
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by j.d.roost View Post

I wonder what other vintage gems Bob has stashed away.
I am betting there is a bunch really cool stuff.
There might be a "few" things...
__________________
www.stormerhobbies.com "Where the world shops for radio control."
www.facebook.com/stormerhobbies
www.twitter.com/stormerhobbies

looking for....vintage 1/10-1/12 pan, need Schumacher 1/12th cars and parts.

Last edited by Bob-Stormer; 11-27-2010 at 08:40 PM.
Bob-Stormer is offline   Reply With Quote
Old 11-27-2010, 08:19 PM   #15
Tech Master
 
superspeed's Avatar
 
Join Date: Feb 2007
Posts: 1,148
Trader Rating: 5 (100%+)
Default

gear diff in pan car = yikes
superspeed is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Serpent 705 J_Longbrake Nitro On-Road 4252 02-23-2015 12:34 AM
Monster / Stadium Trucks Offroad Thread fastwheels Indonesia Racing 1143 09-16-2009 03:04 AM
R/C Stuff Selling Kenneth Tan Singapore R/C Racers 45728 09-09-2009 08:19 AM
2007 WINTER NATIONAL! SuperDaveNT Canadian R/C Scene 1078 05-25-2007 07:44 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 06:24 PM.


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