09-23-2008, 09:51 AM | #1 |
Quarry Creeper Join Date: Jan 2005
Posts: 347
| 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.
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09-23-2008, 10:57 AM | #2 |
RCC Addict Join Date: May 2007 Location: pasadena, tx
Posts: 1,108
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a 55t w/ stock gearing was perfect for me as long as it doesnt way a lot.
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09-23-2008, 07:56 PM | #3 |
Rock Stacker Join Date: Apr 2008 Location: Oregon City
Posts: 50
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Try a Holmes Hobbies 7T cobalt puller motor. buddy has one. they rock
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09-24-2008, 08:33 AM | #4 |
RCC Addict Join Date: Jan 2005 Location: Germany north
Posts: 1,669
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the Cobalt motor will kill the Goliath drivetrain as fast as ... |
09-24-2008, 08:42 PM | #5 |
Rock Stacker Join Date: Apr 2008 Location: Oregon City
Posts: 50
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Upgrade!!!! |
09-24-2008, 10:01 PM | #6 |
Quarry Creeper Join Date: Jan 2005
Posts: 347
| 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. |
09-25-2008, 08:55 PM | #7 |
Quarry Creeper Join Date: Apr 2008 Location: Alexandria
Posts: 207
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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.
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09-25-2008, 08:58 PM | #8 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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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.
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09-25-2008, 09:02 PM | #9 |
Quarry Creeper Join Date: Apr 2008 Location: Alexandria
Posts: 207
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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.
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