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Thread: B.M.T.'s RC4WD Trailfinder 2

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Old 01-31-2012, 07:02 AM   #1
Quarry Creeper
 
Join Date: Dec 2006
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Default B.M.T.'s RC4WD Trailfinder 2

Overview:

I was one of the lucky ones to receive the new Trailfinder 2 in advance, and here is my account of building this kit, with pointers for those who are considering purchasing one for them selves.

First up, the packaging. Rather than the plain box that previous RC4WD kits and ARTR's arrive in, the TF2 box is nicely printed and contains information about the model like we see from larger manufacturers.



Speaking of large, it's not a small package.



Which is good, because as you can see all the major metal components are neatly isolated by shaped foam liners for safe transport.





The Mojave body kit is contained in it's own inner box, and various other bits are in poly bags.





Also included is a nicely printed pictorial instruction booklet that is clear and notes the fastener sizes for each step.



Components of interest:

Various subassemblies come factory completed, so I thought I'd give you a closer look at these, and some observations that I made during assembly.

The R3 2 speed transmission.

This is an all new item from RC4WD, and to me, is one of the high points of the kit. It's the first rc gearbox that I can think of that has been made to actually look like a gearbox. Some could argue that of the old Tamiya 3 speed, but that might have the rough outline of one, but this is something else.

I have no photos of the internals, but it is fully metal geared (with the exception of the external slipper mounted spur).

Internal ratios:
1st 3.47:1
2nd 1.27:1









Mmmmm..... clockable motor plate, hello!




The Hammer transfer case:

Another new item, and is also a gem. Nice alloy case with steel gears and bearings... in fact the output shaft is supported by no less than 4 bearings.

Oh, it has a 1.47:1 ratio.







Cast Yota axles:

Nice... no diffs here, solid drive. The axle housings are a 3 piece affair (ignoring steering knuckles for the front, which are high clearance jobbies). Top and bottom and a separate "banjo" that holds the pinion and bearings.
Again, all metal. The steer axles are a dog bone joint.

I can not stress enough, thread lock the king pin screws before you even install the front axle or you will loose them!

Final drive ratio 2.67:1





Internal Spring shocks:
Pretty... Not much dampening here, but their action is smooth and are of a not too thick body diameter.

Also, I advise to thread lock the lower eye onto the shaft, they turn easily on the thread of the shaft and things possibly could work around over time.



1.55" White steel beadlocks;
I was happy to see these in the kit. One of my favourite beadlocking rc wheels of all time.



Assembly:

You only need basic tools for the chassis. A set of hex drivers, 1.5, 2 and 2.5mm, one of those little box wrench thingies and some thread locking compound. I chose Tamiya Liquid Thread Lock because of it's thicker consistency.

Also, I recommend some form of grease, preferably molybdenum. The pre assembled components are already greased, but a little extra can't hurt. I did this while I was doing those tear down photos earlier.

A place to start....



1st step, lunch.



Next, we start on the chassis. The frame assembly is probably the most time consuming step of the mechanical construction. The instructions are clear, and all the cross members fit neatly into their machined notches. Make sure you note the orientation of the crossmembers when working through this step.







Note these two round crossmembers. The receiver box will eventually sit on these. Don't threadlock or even tighten the screws until you have the box mounted in a later step, because that will align the cross drilled holes to top for you. Once the box is on, you can then take the side screws out one at a time to thread lock them.



The completed frame in all it's glory....





Having been milled out of billet aluminium, it has oodles more torsional strength than a very popular pressed steel C channel frame with plastic members that we all are familiar with.

Next we place wee little machined mounts to that gearbox



Then we mount up the axles to the springs and mount up the suspension. Much quicker to complete than 16 rod ends of a 4 link system.



Drive line in place:



I will be keeping an eye on the plastic Punisher shafts. I normally boot plastic shafts to the kerb before I drive a truck, but I will test these out good and proper to see how they hold up.

Linkage time...

That was not so bad.



When you come to the shift linkage, be careful not to over tweak the 3x8 screw in this little collar. Just snug with some thread lock. The e clips hold it on to the shaft and the shaft its self pivots in the gearbox, so no need to pile on a ton of 70's vintage Arnie



Electricals installed:



I went with a LRP 21.5 sensored crawler set up. The motor is a 1600kv and the ESC has a unique function, it allows either hold brake, or normal push brakes for both forward and reverse. I used an overkill-for-Class 1 12kg/cm servo for steering, but with a 5A BEC onboard the LRP, why not. I used a standard servo for shifting and controlling it all with a Spektrum DX3e.

Oh, if you are planning on using the fuel cell receiver box, you will need a short servo extension cable for the steering servo. Or, do what I did and just extend the servo lead if you are handy with a soldering iron.



Wheels and tyres:

The kit includes 1.55" Mud Thrasher tyres that are under the hight limit for Class 1 and look nice and scale. They mount up easily on the white steelies and are a relaxing, no brainer of a way to finish off the chassis build. Not that the build was hard at all, just the one touch set up for programming the LRP was a pain though.

So, as chassis kits go, I'd rate this the easiest 4x4 kit I have ever built. Everything fitted where it should, no fuss. Also, the high content of metal meant that half the build time was not taken up by clipping parts off sprues and cleaning the nibs off...

Initial product thoughts: Durable. Things a nice and beefy where they need to be (drive shafts, I'm watching you) and parts fit did not even enter my mind, because they did.

I have driven the chassis around my house (raining and dark outside) and it is reasonably quiet for an all metal build and there is a marked difference between the two gears. Factory 1st works out to be 63:1 and 2nd 22:1 off the top of my head, so you don't have to do any weird magics with motors to get tractability and wheel speed in one package - just shift gears.

Body:

Because paint cures slower than I work, I will get back to you on this.

I decided to go with an "easy" body build, so you can see how the Mojave comes out at the hands of a layman.

So far I have removed the molding sprues and flashing from the main body pieces, glued in the rear window frame (I will be using the bed, and keeping the full cab wall for another day) and sprayed the body a nice shade of yellow... Yes, I know it comes molded in yellow, but paint always has a more solid appearance than bare plastic. And, if (WHEN) I get rock rashed, it won't notice so bad!



Stay tuned, more to follow....
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Old 01-31-2012, 07:09 AM   #2
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Good write up, looks like a beast out of the box...
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Old 01-31-2012, 07:40 AM   #3
Quarry Creeper
 
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Thanks, but I'm not done yet

But yes, apart form my phobia of plastic drive shafts, apart form tuning (which I include tyres in that) it doesn't leave much room for improvement.
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Old 02-01-2012, 04:16 AM   #4
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Fiddly bits tonight. Painting details and body accessories.

Slight of hand, light of touch is not working it's majic for me tonight. Ah, duznitmatta, after it's first face planet, any ways....



I love traffic lights, only when they're green. I used Tamiya acrylic clear red and orange on the brake lights and turn signals.



Interiors on Hiluxes were pretty much tan, tan or tan in Australia. First coat is down and drying.



More tomorrow...
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Old 02-01-2012, 04:28 AM   #5
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Oh man you had beans with tiny sausage's in them those are great..
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Old 02-01-2012, 06:01 AM   #6
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Default Re: B.M.T.'s RC4WD Trailfinder 2

That they are... and I'll probably have them again tomorrow! I eat so much better when I am at work.....

Turn lights in....

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Old 02-01-2012, 08:26 AM   #7
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Default Re: B.M.T.'s RC4WD Trailfinder 2

I like that bean can graphic. They sharpied the bean some paddles and the sauce creek.
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Old 02-01-2012, 01:22 PM   #8
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Great right up thus far BMT. Do you think the plastic punsihers could be a fail safe to stop damage to the driveline? I'm looking forward to seeing more body shots. Do the beans come with the kit or are they an IGA extra?
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Old 02-01-2012, 04:04 PM   #9
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Crazy, you guys have IGA owned markets down under. I'll be looking for those sauce creek beans for myself up here then.
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Old 02-01-2012, 05:16 PM   #10
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Nah, the beans were a late night Coles run.

Nitro-star, the gearbox has an adjustable spur mounted slipper. My guess is they are a measure to keep the kit cost down (as too the cast Yota axles, opposed to the Ultimates).

Also, they are much smaller in diameter than the Punisher II's, pretty much the same as Traxxas 'pede sliders. More to scale.

The plastic has a similar feel to Traxxas sliders too, so in the little wheels application they might just hold up as well. However, unlike Traxxas and Axial shafts, the splines are sharp tooth shaped in profile, and there are more of them (6 I think, I didn't count them) so they might not twist and drop their lunch like the others do.
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Old 02-01-2012, 07:25 PM   #11
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Body works...



I love how these side lights came out.

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Old 02-02-2012, 12:09 AM   #12
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Default Re: B.M.T.'s RC4WD Trailfinder 2

On the Tcase how are the input gear and output gear attached to the shafts? pins, pressed?
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Old 02-02-2012, 03:46 AM   #13
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Good question... I never looked at the back side of the gears when I had it out

I'll forward that one to the guys in house....
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Old 02-02-2012, 04:26 AM   #14
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Tcase gears are held on with Pins and also they have a C-clip on the shaft as well
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Old 02-02-2012, 09:54 PM   #15
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This thread is making me want a tf2, stop it! Looking good...
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Old 02-02-2012, 10:17 PM   #16
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Default Re: B.M.T.'s RC4WD Trailfinder 2

I can't wait to get one! ahhhhhhh!
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Old 02-02-2012, 10:28 PM   #17
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Quote:
Originally Posted by Dready View Post
Tcase gears are held on with Pins and also they have a C-clip on the shaft as well
Sweat so with some shaft changes you should be able to overdrive the front axle..
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Old 02-02-2012, 10:41 PM   #18
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Default Re: B.M.T.'s RC4WD Trailfinder 2

I can't see why not.
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Old 02-03-2012, 06:30 AM   #19
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Ok, what a lot have been waiting for, a side by side of the Tamiya and the RC4WD body. BTW, the Tamiya has been pre-loved by a friend, so excuse the mud!

Equal in size and detail, there are a number of subtle differences...

Firstly, the best I could do of an overlay. You can see, even though I did not align them too well, the hood has an ever slightly different profile. Also that hole in the middle of the Tamiya is not present on the RC4WD.





The beds are worlds apart, and note the different profile under the top lip.





The RC4WD Mojave is a thicker molding, with the flares having a thinker lip and different profile





The end of that LOL

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Old 02-03-2012, 08:07 AM   #20
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Default Re: B.M.T.'s RC4WD Trailfinder 2

Here we go... the great unveiling of my TF2....

I was wanting to do the finished photographs of it frolicking in field of buttercups or what not, but since it has been raining for four days straight, my kitchen floor (at night with poorly light corrected pictures) will have to do for the initial ones.





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