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  #1  
Old 05-06-2003, 02:53 PM
actofgod actofgod is offline
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Join Date: Sep 2002
Posts: 216
Arrow Kidriffic Micro RC 4x4 Monster Truck Dissection (pics)

If you have not already heard of this, please read the 4+4 monster truck thread first.

Now, here is a recap of the stats:

* Dual 80mAh NiCd 1/3AAA cells
* Twin 11mm Motors
* 4-wheel drive
* Tank-style steering
* 2.75" x 1.2" body, similar to Zip-Zap size


First, let's look at the vehicle straight out of the box.
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File Type: jpg 4x4-front.jpg (29.3 KB, 980 views)
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  #2  
Old 05-06-2003, 02:53 PM
actofgod actofgod is offline
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more
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File Type: jpg 4x4-top.jpg (24.7 KB, 953 views)
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  #3  
Old 05-06-2003, 02:54 PM
actofgod actofgod is offline
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Posts: 216
Size comparison. Left to right: 4x4, bit-charg, my bfm-9000 bit char-g.
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File Type: jpg 4x4-sizecompare.jpg (55.8 KB, 963 views)
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  #4  
Old 05-06-2003, 02:55 PM
actofgod actofgod is offline
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Now I'll remove the body. Remove a screw from the back underside of the vehicle, plus one under the sunroof sticker, and remove the two plastic clips attached to tabs on the side. Pull up and forwards, as there is a front tab still holding the body. The bodies are the same size as several toy cars such as the Stampeder-brand Jeep body shown here. With some modifications, many bodies will fit.
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File Type: jpg 4x4-bodycompare.jpg (18.0 KB, 927 views)
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  #5  
Old 05-06-2003, 02:56 PM
actofgod actofgod is offline
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Posts: 216
Under the body shell, you can see the PCB and batteries. The PCB is a little larger than a Bit-sized PCB. Mine says it is "Rev 01". It has leads for two motors instead of one motor and a steering magnet. It is loosely centered on a black plastic peg that runs through a hole in the PCB. The batteries are 80mAh NiCds.
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File Type: jpg 4x4-bodyoff.jpg (25.8 KB, 909 views)
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  #6  
Old 05-06-2003, 02:57 PM
actofgod actofgod is offline
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There is one screw under each battery, and then the car can be divided into two sections. Here is the separation in progress.
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File Type: jpg 4x4-beginseparate.jpg (40.1 KB, 903 views)
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  #7  
Old 05-06-2003, 02:57 PM
actofgod actofgod is offline
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Let's look at the lower section first. You can see two gearboxes, four wheels, and two plastic guide pieces which hold the wheels in place.
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File Type: jpg 4x4-bottomsection.jpg (33.7 KB, 888 views)
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  #8  
Old 05-06-2003, 02:58 PM
actofgod actofgod is offline
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The gearboxes transfer power from the motor to both wheels on that side simultaneously; i.e. each motor powers two wheels, either the right ones or the left ones. Each gearbox is removable and interchangeable. The motor has a 7-tooth gear; other gears are either 20-tooth transfer gears or 20-tooth gears with a 7-tooth gear attached. The final gear ratio is 20/7 * 20/7 * 20/7 = 23.32:1. This means for every 23.32 rotations of the motor, the wheels turn once. This gives the already high-torque motors a lot of leverage on the big wheels; in fact, the climbing power is limited more by the traction of the tires than the available torque.
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File Type: jpg 4x4-gearboxside.jpg (26.8 KB, 867 views)
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  #9  
Old 05-06-2003, 02:59 PM
actofgod actofgod is offline
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another
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File Type: jpg 4x4-gearboxtop.jpg (17.0 KB, 848 views)
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  #10  
Old 05-06-2003, 03:00 PM
actofgod actofgod is offline
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inside
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File Type: jpg 4x4-gearboxintop.jpg (22.1 KB, 843 views)
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  #11  
Old 05-06-2003, 03:00 PM
actofgod actofgod is offline
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inside again
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File Type: jpg 4x4-gearboxinside.jpg (30.2 KB, 828 views)
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  #12  
Old 05-06-2003, 03:01 PM
actofgod actofgod is offline
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There are four individual wheels, connected only by the gearboxes on each side. Each wheel has a small axle hub that fits into a hole in the black connector piece, a 20-tooth gear, which touches the edge of the gearbox when in place, and a black plastic bearing that is held stationary in the chassis while the axle spins inside it. The wheels are plastic with ridges to hold the tires on. The tires seem to be a soft plastic; they have decent grip but leave a lot to be desired compared to soft rubber bit tires, though these are great for carpet. In the second picture, you can see a Stampeder chassis; their axle, wheel, or tires could be used on the 4x4 with some modification. In the trio of tires at the bottom of the picture, the top left one is a stampeder tire. These are thicker and heavier than the 4x4 tires and seems to be medium-firm rubber. If used, the extra weight might keep the 4x4 from flipping backwards during steep climbs.
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File Type: jpg 4x4-wheelclose.jpg (16.1 KB, 832 views)
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  #13  
Old 05-06-2003, 03:02 PM
actofgod actofgod is offline
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more wheels
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File Type: jpg 4x4-wheels.jpg (31.4 KB, 819 views)
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  #14  
Old 05-06-2003, 03:02 PM
actofgod actofgod is offline
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The chassis itself has slots where the wheel bearings go, slots for the gearboxes, a hole in the center where the charger plug connects, and two tabs that are used to help keep the body attached. It is symmetrical except for some copyright text on the bottom. You can reverse the wheels, gearboxes, and chassis-to-upper-section orientation. The only way to tell which direction the chassis should go when reattaching to the upper section is to make sure the copyright text is on the same side of the vehicle as the screw in the back.
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File Type: jpg 4x4-bodyempty.jpg (37.9 KB, 816 views)
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  #15  
Old 05-06-2003, 03:03 PM
actofgod actofgod is offline
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Now let's go back to the upper section. I have commented on it from this view already. It is shown here with batteries removed. The legs extend to slots in the bottom chassis where they help hold the wheel bearings in place. Do notice the orange/tan disc capacitors (noticeable in upper left near battery compartment); these are connected to the motors at the same point that the power leads attach.
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File Type: jpg 4x4-topsection.jpg (13.8 KB, 810 views)

Last edited by actofgod; 05-06-2003 at 03:09 PM.
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