Go Back   RCCrawler Forums > RCCrawler General Tech > General Crawlers
Loading

Notices

Thread: Rock racer motor?

Reply
 
LinkBack Thread Tools Display Modes
Old 09-23-2008, 09:51 AM   #1
Quarry Creeper
 
Join Date: Jan 2005
Posts: 347
Default Rock racer motor?

I'm about to complete a Goliath build that I'm setting up as a rock racer. I'm now trying to decide what motor and pinion to use for this purpose. I'm not using a gru of any kind in order to retain the relatively high gearing of the Goliath in it's stock form. I have retained the stock Imex Red Rock tires (on beadlocks) as well. Any suggestions or ideas would be more than welcome at this point.
BeeRC is offline   Reply With Quote
Sponsored Links
Old 09-23-2008, 10:57 AM   #2
RCC Addict
 
Join Date: May 2007
Location: pasadena, tx
Posts: 1,108
Default

a 55t w/ stock gearing was perfect for me as long as it doesnt way a lot.
goobs is offline   Reply With Quote
Old 09-23-2008, 07:56 PM   #3
Rock Stacker
 
Join Date: Apr 2008
Location: Oregon City
Posts: 50
Default

Try a Holmes Hobbies 7T cobalt puller motor. buddy has one. they rock
crawler_newb is offline   Reply With Quote
Old 09-24-2008, 08:33 AM   #4
RCC Addict
 
Join Date: Jan 2005
Location: Germany north
Posts: 1,669
Default

the Cobalt motor will kill the Goliath drivetrain as fast as ...
EGRESSor is offline   Reply With Quote
Old 09-24-2008, 08:42 PM   #5
Rock Stacker
 
Join Date: Apr 2008
Location: Oregon City
Posts: 50
Default

Upgrade!!!!
crawler_newb is offline   Reply With Quote
Old 09-24-2008, 10:01 PM   #6
Quarry Creeper
 
Join Date: Jan 2005
Posts: 347
Default Rock racer motor?

Thanks for the ideas you are sending.

I should also add that I'll be running a 6 cell nimh 4/5A pack in this rig. I may try my 2s lipo in it as well once I run it for a while with the 4/5A pack and get it set up to my liking.
BeeRC is offline   Reply With Quote
Old 09-25-2008, 08:55 PM   #7
Quarry Creeper
 
Join Date: Apr 2008
Location: Alexandria
Posts: 207
Default

If you build a drivetrain to handle the power, I don't think there's a better rock racer motor out there than the Holmes Hobbies Cobalt. I don't run PTI axles so I don't know what you would need to do to beef them up to handle the power, but if you can get them stout, the cobalt motors are premium for a project like that. They have enough torque that you can gear them however you want to limit wheelspeed, from an 8 or 9 tooth pinion for optimal crawling gearing, to a 20-25 tooth pinion according to John Robert, and still have rediculous low end torque while keeping the wheelspeed that you're looking for.
CharliesTheMan is offline   Reply With Quote
Old 09-25-2008, 08:58 PM   #8
owner, Holmes Hobbies LLC
 
JohnRobHolmes's Avatar
 
Join Date: Nov 2004
Location: Volt up! Gear down!
Posts: 20,290
Default

You will probably need to get bigger batteries if you want a good bit of speed, but I bet you can get 15mph out of a 35t and proper gearing. You may go as low as a 25t if the ESC and batteries can take it.
JohnRobHolmes is offline   Reply With Quote
Old 09-25-2008, 09:02 PM   #9
Quarry Creeper
 
Join Date: Apr 2008
Location: Alexandria
Posts: 207
Default

If you can find one of John Robert's 35 turn handwound 540 motors, IMO they are the best motors on the market besides his cobalt motors. I have several of each, and it's the only motors that I run.
CharliesTheMan is offline   Reply With Quote
Reply



Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 05:45 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com