RCCrawler Forums

JohnRobHolmes · 04-06-2008, 03:27 PM

Mann0mann- that battery isn't quite enough. For the 10t I would say you need at least a 1600 15C pack.

TK- I can't tell you if it will fit. How much room is around a normal 540 motor in the rig?

Contracted- I have 7t Pullers available for presale on the site again.

JohnRobHolmes · 04-06-2008, 03:33 PM

I have a new batch of 7t Cobalt Pullers, 4 in stock and 40 going to the machinist on monday.

These can be shoehorned into an sw3 with an r2 tranny, but they are longer motors than a standard 540. The torque is much higher than any other brushed motor that works in a crawler. More wheelspeed, more torque, more power in general. With a 7 slot armature you also get much better slow speed control as compared to normal brushed motors. I run these in every one of my rigs now, with exception to a few scale rigs and my really fast bashers. Yes, they are in fact powerful enough to make me leave outrunner motors for a while. My avatar is the armature.

Get your foot in the door while you can, these motors get snatched up quick

http://holmeshobbies.com/product.php...2&cat=0&page=1

Badgers kick ass vid: http://ca.youtube.com/watch?v=fJS4c36tcjs

Thorsteenster · 04-06-2008, 03:54 PM

Good God, that is sick, great vid!

JohnRobHolmes · 04-07-2008, 08:10 AM

...

TxCruzr · 04-07-2008, 01:56 PM

Not that I need one but I had to get one :-P

cartronicshn · 04-07-2008, 03:29 PM

Done

4u2nv · 04-07-2008, 03:39 PM

Do you have something comparable to this but brushless?

JohnRobHolmes · 04-07-2008, 05:05 PM

Quote:

Originally Posted by 4u2nv

Do you have something comparable to this but brushless?

Not really. The pullers have torque, speed, and low speed driveability. The closest brushless would be a novak goat system but they don't have the drag or torque. A fast outrunner would have the torque but not the low speed resolution.

Nabil · 04-07-2008, 05:19 PM

got one too for my prerunner/crawler

cartronicshn · 04-07-2008, 05:31 PM

Quote:

Originally Posted by JohnRobHolmes

Not really. The pullers have torque, speed, and low speed driveability. The closest brushless would be a novak goat system but they don't have the drag or torque. A fast outrunner would have the torque but not the low speed resolution.

Thanks guys! 29 left.

Are you serious, these have more torque than my goat systems, if so

JohnRobHolmes · 04-07-2008, 05:38 PM

Yes, the stator is much larger than the magnet on the Goat. It is also longer, and has more commutation cycles per revolution. All adds up to more torque.

dezrik · 04-07-2008, 08:43 PM

Would a 7T with 21T/87T still have enough torque for crawling?

Just Zach · 04-07-2008, 09:09 PM

Just picked up 2, thanks JRH

JohnRobHolmes · 04-07-2008, 09:11 PM

Quote:

Originally Posted by dezrik

Would a 7T with 21T/87T still have enough torque for crawling?

Yep. You could gear it to the moon and have enough torque if your batteries would deliver the amps.

Thorsteenster · 04-07-2008, 09:16 PM

Sorry to get off topic, but what are the rpm per volt for the 10t and max volts?

JohnRobHolmes · 04-07-2008, 09:17 PM

I measured the 10t at 1800, max voltage 4s lipo.

The 7t is listed at 1800 by the manufacturer, but I think that is loaded. It actually spins closer to 2300 by my last measurements.

dezrik · 04-07-2008, 09:22 PM

So what kind of battery do you recommend? 20C 11.1v LiPO?

JohnRobHolmes · 04-07-2008, 09:40 PM

A 15C 2100 seems to do the trick on the 7t. You could use a smaller battery with 20C discharge.

Mac10 · 04-07-2008, 09:43 PM

paypal sent.

thanks JRH!

anychance I will get one of those bad a$$ HH stickers with it?

JohnRobHolmes · 04-07-2008, 09:50 PM

I need to get more stickers made. Already given out about 1000 of em, and I have run out.

04-06-2008, 03:33 PM	#122
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Cobalt Puller 7t--limited stock I have a new batch of 7t Cobalt Pullers, 4 in stock and 40 going to the machinist on monday. These can be shoehorned into an sw3 with an r2 tranny, but they are longer motors than a standard 540. The torque is much higher than any other brushed motor that works in a crawler. More wheelspeed, more torque, more power in general. With a 7 slot armature you also get much better slow speed control as compared to normal brushed motors. I run these in every one of my rigs now, with exception to a few scale rigs and my really fast bashers. Yes, they are in fact powerful enough to make me leave outrunner motors for a while. My avatar is the armature. Get your foot in the door while you can, these motors get snatched up quick http://holmeshobbies.com/product.php...2&cat=0&page=1 Badgers kick ass vid: http://ca.youtube.com/watch?v=fJS4c36tcjs Last edited by JohnRobHolmes; 06-07-2008 at 07:58 PM.

04-07-2008, 08:10 AM	#124
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	... Last edited by JohnRobHolmes; 06-07-2008 at 07:58 PM.

HH Cobalt Puller- Reborn page 35! - Similar Threads
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04-06-2008, 03:27 PM	#121
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Mann0mann- that battery isn't quite enough. For the 10t I would say you need at least a 1600 15C pack. TK- I can't tell you if it will fit. How much room is around a normal 540 motor in the rig? Contracted- I have 7t Pullers available for presale on the site again.

04-06-2008, 03:54 PM	#123
Thorsteenster I wanna be Dave Join Date: May 2006 Location: Arlington, VA Posts: 3,377	Good God, that is sick, great vid!

04-07-2008, 01:56 PM	#125
TxCruzr Rock Crawler Join Date: Dec 2005 Location: Borderland Tejas Posts: 750	Not that I need one but I had to get one :-P

04-07-2008, 03:29 PM	#126
cartronicshn I wanna be Dave Join Date: May 2006 Location: HONDURAS...ROCK HEAVEN Posts: 5,076	Done

04-07-2008, 03:39 PM	#127
4u2nv RCC Addict Join Date: Feb 2005 Location: Minnesota Posts: 1,516	Do you have something comparable to this but brushless?

04-07-2008, 05:19 PM	#129
Nabil no talent hack Join Date: Feb 2007 Location: Redwood City Posts: 2,479	got one too for my prerunner/crawler

04-07-2008, 05:38 PM	#131
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Yes, the stator is much larger than the magnet on the Goat. It is also longer, and has more commutation cycles per revolution. All adds up to more torque.

04-07-2008, 08:43 PM	#132
dezrik Rock Crawler Join Date: Aug 2006 Location: Pinedale, WY Posts: 873	Would a 7T with 21T/87T still have enough torque for crawling?

04-07-2008, 09:09 PM	#133
Just Zach '08 2.2 National Champ Join Date: Nov 2006 Location: UTRCRC Posts: 5,585	Just picked up 2, thanks JRH

04-07-2008, 09:16 PM	#135
Thorsteenster I wanna be Dave Join Date: May 2006 Location: Arlington, VA Posts: 3,377	Sorry to get off topic, but what are the rpm per volt for the 10t and max volts?

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04-07-2008, 09:17 PM	#136
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	I measured the 10t at 1800, max voltage 4s lipo. The 7t is listed at 1800 by the manufacturer, but I think that is loaded. It actually spins closer to 2300 by my last measurements.

04-07-2008, 09:22 PM	#137
dezrik Rock Crawler Join Date: Aug 2006 Location: Pinedale, WY Posts: 873	So what kind of battery do you recommend? 20C 11.1v LiPO?

04-07-2008, 09:40 PM	#138
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	A 15C 2100 seems to do the trick on the 7t. You could use a smaller battery with 20C discharge.

04-07-2008, 09:43 PM	#139
Mac10 Rock Crawler Join Date: Apr 2006 Location: I hope you SHUT UP!!! Posts: 716	paypal sent. thanks JRH! anychance I will get one of those bad a$$ HH stickers with it?

04-07-2008, 09:50 PM	#140
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	I need to get more stickers made. Already given out about 1000 of em, and I have run out.

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Thread: HH Cobalt Puller- Reborn page 35!