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09-26-2005, 07:22 PM
| #1 |
| Rock Crawler   Join Date: Jan 2005 Location: Tumwater
Posts: 900
|  40's...how low can you go? If you have 40's take a look. Three cells per hub five cells for the rx seven cells for the motors LOW center of gravity, worked well at PARC BB9. Last edited by grover; 09-26-2005 at 08:38 PM. |
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09-26-2005, 10:17 PM
| #2 |
| I wanna be Dave Join Date: Apr 2005 Location: It's good to be a Pirate!
Posts: 7,164
| I saw the comp pics. Pretty cool idea. I also posted that you might try the TXM Thorns. They give you another 1/2 inch in diameter to give you some more room. Last edited by FrankyRizzo; 03-28-2007 at 08:48 AM. |
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09-26-2005, 10:43 PM
| #3 |
| Pebble Pounder Join Date: Jul 2005 Location: Denver
Posts: 171
| thats trick! nice idea... |
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09-26-2005, 11:00 PM
| #4 |
| TCS/Holmes Hobbies  Join Date: Feb 2005 Location: Burnsville
Posts: 2,457
| How do the batteries stay in place? Are they attached to the wheel or to the hub, or what? Could you possibly show a pic with the wheel off? That is a very interesting way to mount your batteries, good thinking. |
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09-26-2005, 11:03 PM
| #5 |
| Pebble Pounder Join Date: Jul 2005 Location: Denver
Posts: 171
| they are strapped to the knuckle i believe. the wheel spins around them just like the wheel spins around the steering knuckle. |
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09-26-2005, 11:04 PM
| #6 |
| Rock Stacker Join Date: Aug 2005 Location: San Diego
Posts: 70
| Looks like the cells are ziptied to the axle shaft....Do I win? |
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09-26-2005, 11:17 PM
| #7 |
| Rock Crawler Join Date: Jan 2005 Location: Tumwater
Posts: 900
| For now the prototype(quicky get it done the day before the comp) technique for holding the batteries is with plastic specific epoxy and the zip ties were used to hold the batteries in place while it dried. I saw no reason to take of the zip ties as there is plenty of clearance. It will be done very differently on my next crawler but it works very well as is. Its hard to spend to much time on fab if you plan on building a new truck for every comp(I just have to many ideas and not enough time I guess). |
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09-26-2005, 11:27 PM
| #8 |
| TEAM MODERATOR   Join Date: Jul 2004 Location: Chit Chat
Posts: 14,100
| Very slick Grover. And I just sized up my AA batteries to fit inside regular Maxx wheels...  |
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09-26-2005, 11:40 PM
| #9 |
| TCS/Holmes Hobbies Join Date: Feb 2005 Location: Burnsville
Posts: 2,457
| Wow, thanks for the pic. That is awesome. |
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09-27-2005, 02:22 AM
| #10 |
| Quarry Creeper Join Date: Apr 2005 Location: Malaysia
Posts: 350
| This man is crazy. Nice work  |
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09-27-2005, 08:31 AM
| #11 |
| Colt Python/SR9c  Join Date: Feb 2004 Location: out in the shop, reloading ammo!
Posts: 8,677
| JIA tried to explain it to me last night, but i'm still lost as the run of the wires :? how did you get around that? it seems even if you installed the wires in the axle tube itsself, it would still just rotate around until it turned so much and twisted off/broke the wires.. maybe i'm just missing something simple  |
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09-27-2005, 09:00 AM
| #12 | |
| RCC Addict Join Date: Nov 2004 Location: Redding, CA
Posts: 1,295
| The batterys don't spin with the wheel. They are solid mounted strait to the steering knuckle. Quote:
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09-27-2005, 09:07 AM
| #13 |
| Rock Crawler Join Date: Jan 2005 Location: Tumwater
Posts: 900
| The batteries do not spin at all. They are mounted solid on the hub(steering knuckle). The wires just need to be tightly secured to the the hub and batteries. The wires need to have enough flex(slack) to let the hub steer from full left to full right. You end up using alot of wire so intead of 12 gauge silic. wire I chose something a bit smaller and more flexable(roughly 18 gauge with a pliable dialectric). For those looking for the next evolution...be thinking about quick change mounting. Beyound that I am practically beging my machine shop to get the cnc mill attachments to do a alloy knuckle with the necessary battery profile built in. This would easilly allow sub c size batteries in clod or standard max size wheels. I know that my next version for PBB10 will use solid prefab battery bars especially the ones that the wire ultimatly attaches to(the large ones that wrap up and over the top of the cell). This will make it possible to shrink wrap the entire knuckle. I know I am giving up the quick change option but with this much battery I have had no problems running all the necessary comp stages and alittle play time after. Last edited by grover; 09-27-2005 at 09:11 AM. |
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09-27-2005, 09:24 AM
| #14 |
| Rock Crawler Join Date: Dec 2004 Location: www.ORCRC.com
Posts: 697
| Very cool idea! |
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09-27-2005, 09:51 AM
| #15 |
| Rock Crawler Join Date: Jan 2005 Location: Tumwater
Posts: 900
| Thanx to all for the Kudos. I am glad to see that other cell/wheel combos are already being sized up. I did not know exactly where this thread should be put it was inspired by the massive 40s but directly relates to electronics(batts), and I just hoped that the general crawlers would have the widest audiance. Post em up...Lets see those stuffed wheels. |
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09-27-2005, 10:43 AM
| #16 |
| Colt Python/SR9c Join Date: Feb 2004 Location: out in the shop, reloading ammo!
Posts: 8,677
| ahh ok, I didn't even pay attention that they was mounted to the knuckle instead of the wheel  that is a great idea though, good job  |
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09-27-2005, 12:35 PM
| #17 |
| Rock Crawler Join Date: Aug 2004 Location: woods cross utah
Posts: 525
| so your running 24 cells? |
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09-27-2005, 12:41 PM
| #18 |
| TCS/Holmes Hobbies Join Date: Feb 2005 Location: Burnsville
Posts: 2,457
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09-28-2005, 12:03 PM
| #19 |
| Quarry Creeper Join Date: Jun 2004 Location: Fairmont
Posts: 226
| Does the extra weight on the knuckles make it harder for your servo to steer? Or are you using a large enough (STRONG ENOUGH) servo to handle the extra weight easily? Clark |
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09-28-2005, 12:35 PM
| #20 |
| Rock Crawler Join Date: Jan 2005 Location: Tumwater
Posts: 900
| I was using shot in my wheels to lower the center of gravity. Now instead of the shot the batteries are there. Effectivly I have the same load or nearly the same as befor. I do know that now that cars69 has switched to this battery placement with four cells per hub on the front only he has not taken the shot out and is loving the effect. We are both currently runny 645mg servos. I would assume however that running the batteries and the shot at the same time would be a major strain on both the stearing knuckle and the servo. |
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