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11-11-2008, 10:00 PM
| #1 |
| R.I.P. Chip   Join Date: Jan 2004 Location: The Crawler State
Posts: 13,938
|  Cool custom build, the RCCAV
I've been working on this project for a long time, but finally today just got it into the roller state. R.C.C.A.V. RCCrawler Assault Vehicle. Stage 1 is just just the running vehicle, I should have that done here very shortly. Stage 2 will be a weapons system. This will consist of an airsoft gun, and a wireless video camera all operated by the radio.  Specs: 34 inches long, 23 inches wide, 8 inches tall, and nearly 70 pounds. Gear: 6 RC4WD 40 series Rock crushers, 6 Axial 40 series beadlocks, 6 550 size motors, 6 planetary gearboxes, 2 17,000mah 12 volt batteries, 2 Castle Creations Monster Maxes, 1 Futaba 6EX 2.4ghz radio system. The side chassis plates are all cut from 1/8" steel, the top, bottom, front and back are all 1/4" black delrin. The 2 pods are held together by 4 3/8" shank bolts into slotted holes to allow for articulation. If my calculations are correct this 70lb beast should do right around 10MPH. All I have left to do is to wire it and install the electronics and we'll see how it does. I am working with Northwest trac tech on some custom tire foams to be able to handle this amount of weight, and I am still second guessing my battery choice. I am thinking about maybe having some custom NIMH packs built instead. Onto the pics. |
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11-11-2008, 10:05 PM
| #2 |
| Diggin' the new SCX10 II!  Join Date: Mar 2004 Location: Norcal
Posts: 11,402
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Nice! I can't wait to get shot by this thing!  |
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11-11-2008, 10:06 PM
| #3 |
| Rock Crawler Join Date: Feb 2007 Location: CoMo...Kickin it with Holmes Hobbies
Posts: 805
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thats just sick.
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11-11-2008, 10:06 PM
| #4 | |
| I wanna be Dave Join Date: Jan 2005 Location: Hueytown, Alabama
Posts: 6,777
| Quote:
 I am not coming anywhere near you at Nats next year......  | |
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11-11-2008, 10:10 PM
| #5 |
| 06 Super National Champ  Join Date: Jun 2004 Location: Stark Industries Bar and Grill
Posts: 11,361
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Needs a Sentry system mounted on it. ;)
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11-11-2008, 10:13 PM
| #6 |
| [HOONIGAN]  Join Date: Nov 2005 Location: Grand Junction
Posts: 4,269
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Good to see this finally taking shape!!!! You think those hexes are going to hold up? |
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11-11-2008, 10:17 PM
| #7 | |
| R.I.P. Chip Join Date: Jan 2004 Location: The Crawler State
Posts: 13,938
| Quote:
Here is another pic to give you some kind of size reference. | |
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11-11-2008, 10:24 PM
| #8 | ||
| I wanna be Dave Join Date: May 2006 Location: FOUR 8 OH
Posts: 4,913
| Quote:
Quote:
Just wait till they program it to chase after you! | ||
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11-11-2008, 10:26 PM
| #9 |
| Rock Stacker Join Date: Dec 2007 Location: louisville, Ky
Posts: 77
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basically its a tank with wheels instead of tracks i like it and im anxious to see it when its finished, airsoft and all gotta use the paint pellets though and make it fully automatic or its no fun  |
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11-11-2008, 10:27 PM
| #10 | |
| I wanna be Dave Join Date: Jan 2005 Location: Hueytown, Alabama
Posts: 6,777
| Quote:
I think you are going to need to add about 16oz to the front, 8 in the centers and 4 in the rear. Seriously man, thats going to be bad ass! Plenty of room to hold all the airsoft bb's too. Its bigger than I thought it was. | |
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11-11-2008, 10:40 PM
| #11 |
| Gettin’ back on the horse Join Date: Feb 2006 Location: Hoonsville
Posts: 6,671
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Dang cranked that chassis out Jason! Aaron made it right?
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11-11-2008, 10:43 PM
| #12 |
| owner, Holmes Hobbies LLC  Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Nice to see this ready to rock! For plowing your driveway the lead acid will work well. For shooting things a lighter pack would certainly be nice. What voltage are you running it on? 12 or 24v?
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11-11-2008, 10:49 PM
| #13 | |||
| R.I.P. Chip Join Date: Jan 2004 Location: The Crawler State
Posts: 13,938
| Quote:
Quote:
Quote:
John I still haven't figured out how low I can run these batteries? Drive it till it won't drive then charge like a NiMH or do I need to set a low voltage cutoff? | |||
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11-11-2008, 10:57 PM
| #14 |
| owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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You would be best off to only use half of the battery capacity and then immediately recharge- this will make them last very long. Lead acid generallly doesn't like deep cycles. 10.8v is dead if I remember correctly. Somewhere around 12v should be half capacity, maybe a touch under that voltage.
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11-11-2008, 11:24 PM
| #15 |
| R.I.P. Chip Join Date: Jan 2004 Location: The Crawler State
Posts: 13,938
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So I should be good if I set the cutoff on the Monster maxes to 12v?
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11-12-2008, 06:13 AM
| #16 |
| owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Yeah, as long as the batteries take the discharge asked of them. They should since you have so much capacity. I would be interested to see the amp draw of that sucker.
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11-12-2008, 08:35 AM
| #17 |
| R.I.P. Chip Join Date: Jan 2004 Location: The Crawler State
Posts: 13,938
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The stall rating of each motor is 85 amps.
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11-12-2008, 08:36 AM
| #18 |
| owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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You won't be stalling them at full throttle methinks. The batteries should take about 170 amps for a minute or two, 5c discharge rate.
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11-12-2008, 08:44 AM
| #19 |
| RCC Addict Join Date: Apr 2007 Location: RAMBLIN
Posts: 1,713
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assault maddness. nice work.one big bad@$$ killing machine.
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11-12-2008, 08:46 AM
| #20 |
| R.I.P. Chip Join Date: Jan 2004 Location: The Crawler State
Posts: 13,938
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Running this cool calculator I found here are some numbers for you John. Torque required per motor to get it moving, 693 oz-in Amps required per motor to get it moving, 17.412 Theoretical top speed 10.013 Total peak amps 104.47 Amp hours required to run for 5 minutes, 6.0942 Time to top speed, 1.49 seconds Distance to top speed 15.879 feet Effective pushing force 63 LBS |
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