Review: Tamiya Twin Detonator
Model overview:
The Twin Detonator is a 4WD twin-motor "racing truck" from Tamiya. It is identical in all respects other than the body style and wheel colour to the Wild Dagger and Double Blaze trucks. It is also virtually identical to the Dual Hunter, which again shares the same chassis, but features a stadium truck body and comes with an ESC. Although claimed to be based on a similar concept to the TL01B, and sharing most suspension components with this model, it is nonetheless a rather different beast. It does have a lot in common with the Blackfoot Extreme though, effectively being an Extreme with an extra front gearbox. Size-wise, it is virtually identical to a Traxxas Stampede. It is a bit small to be called a Monster Truck, but a bit big to be called a Stadium Truck. I just call it a bakkie.
What do you get for your money?:
The first thing you'll find when opening the rather large box is a nice truck-style Lexan bodyshell moulded to Tamiya's usual high standard. Beneath that, you'll find the usual pile of black plastic sprues, parts bags, a few interesting decorative chrome bits and two smaller boxes, each of which contains a pre-assembled gearbox with a motor attached. The gearboxes contain a mixture of plastic and bronze bushings. Unlike the newer Dual Hunter kit that is supplied with an ESC, the Twin Detonator is supplied with an old-school mechanical speed controller wired to supply the two motors. Underneath all the goodies, you'll find the manual and two sheets of decals. In keeping with the old-school approach, these are not pre-cut. Like almost all hobby-level kits, you need to supply the radio gear and battery.
Putting it all together:
Anyone who has put together a Tamiya kit before would have no difficulties with this one. Most of the time, the instructions are not really necessary; however for a first-time builder the instructions are excellent in most respects. I started by pulling apart the gearboxes and replacing all the bushings with bearings. Vaguely following the order of events spelled out in the instructions, I then moved onto the chassis halves, mounting servos and cross-braces on them. Finally, I mounted the gearboxes to the chassis halves and attached the suspension and wheels. I had myself a rolling chassis in one evening.
The second evening of work was dedicated to the bodyshell and electronics. The supplied stickers allow you to put together a very, um, bright truck with minimal painting skills. However I preferred a more subtle look, so I just went with metallic green and "mechanical" stickers (windows, grille, lights, etc). The body really comes alive with the addition of the chrome roll bar and spotlights, which are easily adapted to take LEDs for those whose tastes go that way.
On a stock Twin Det, the electronics are a simple matter of plugging in the mechanical speed controller and servo to your receiver, checking that everything is neutral and travelling in the right direction, plugging in the motors and taking it for a test drive. My model was a bit more complex though. A 6-channel PCM receiver feeds two steering servos (front and rear) and two ESCs (front and rear) and is in turn powered by a stand-alone miniature receiver battery mounted low in the frame. Wiring it up neatly took a bit of time. Programming the 6-channel computer transmitter took even longer! The end result was worth it though. I can now switch between front-wheel drive, rear-wheel drive and four-wheel drive, or have independent control over each motor. I can do something similar with the steering, with front-steer, rear-steer, crab-steer, opposing steer and independent steer all being selectable on the Tx. Just the thing for crawling, or for showing off!
For people who enjoy modifying their models, the Twin Detonator is a great project model. For one thing, it is fully symmetrical front to back, so four-wheel steering is really easy to install by mirroring the set-up on the front. The suspension upgrades available for the TL01B will bolt straight on to the Twin Det, as will quite a number of other bits and pieces for other models. The gearboxes and diffs are as tough as they come, capable of taking pretty much any motor combo out there. There is even an active forum dedicated to the art of modifying this chassis, to be found at http://rcdaggerweb.com.
Nothing is perfect though, and there are a few things to keep in mind when building and modifying a Twin Det. Firstly, the gearboxes, which come pre-assembled, are not covered in particularly great detail in the instructions. Since many builders, even first-time ones, would want to install bearings from the outset, I think this could have been covered in a bit more detail for novice builders who may not be very good at remembering how things go together once they have pulled them apart.
Secondly, the stock dogbones are said to be rather weak and feeble. I haven't had any trouble with mine on the stock motors, but I gather that they tend to twist and snap if you upgrade the power side of things. It is an easy fix though