F102

F102 is the logical evolution of the F101 chassis, in fact, these two chassis were released in the early 1990s and were on the market at the same time; there are four models that are equipped with the F102 chassis:

– Mc Laren MP4/6 Honda, model number 58104, put on sale in 1992 and available on the market until 1994,
– Williams FW14 Renault, model number 58105, put on sale in 1992 and available on the market until 1994,
– Footwork FA13 Mugen-Honda, model number 58114, put on sale in 1992 and available on the market until 1994, and
– Benetton B192, model number 58118, offered for sale in 1993 and available on the market until 1994

These four models represent a very important innovation for Tamiya, and there are several images that Tamiya published in Guide Books in the early 1990s.

The parts list for Mc Laren MP4/6 Honda model number 58104 and Williams FW14 Renault model number 58105 shows that for the models equipped with the F102 chassis, they have a lot of parts in common, and there have been no particular technical developments.

The models differ in body, front and rear wing shape. Starting from the upper left corner, proceeding to the right and then going down starting from the left again going to the right are highlighted the four different front wing shapes of the Mc Laren MP4/6, Williams Fw14, Footwork FA13 and Benetton B192.

Starting from the upper left corner, proceeding to the right and then descending starting from the left again going to the right are highlighted the rear wings of the Mc Laren MP4/6, Williams Fw14, Footwork FA13 and Benetton B192.

The main features of this frame are the same as the F101 frame; in fact, it is an evolution of it.

– retains the new rear ball differential introduced on the F101 chassis and which will be taken up later as for the Group C chassis and the F10x series
– new FRP bottom plate that is an evolution of the one released on the F101 chassis: it retains the division into two sections with a load-bearing function and to dampen ground roughness. The shape of the frame echoes the design philosophy of the F101 frame: a different proportion between the two parts and different geometric shapes improve riding precision and road holding. The main frame is thinner and longer, and the T-frame has a slightly different shape. The attachments for the front suspension and rear motor-transmission system are the same. The F102 frame has a constant height of about 7 mm, the wheelbase of the F102 frame is the same as the F101 frame and is 260 mm which is 10 mm longer than that of the Road Wizard family. Road Wizard frame highlighted in blue, the F101 frame highlighted in red, and the F102 frame highlighted in green.

The different frame shape results in a different installation of the battery housing frame. The fiber reinforcement joining the T with the main frame changes in shape; left is the F101 version and right is the F102 version.

In the F102 chassis, there is no longer the plate that comes between the rear motor-transmission system and the battery holder frame highlighted in red in the figure. The columns in chassis F101 (highlighted in green) are one millimeter shorter (the thickness of the plate highlighted in red) than those similar in shape in chassis F102 (highlighted in orange).

The top plate of the F102 fiber frame maintains the same size and shape as the F101 frame. The different shape of the main frame and T for the F102 version compared to the main frame and T of the F101 version results in the shock absorber attachment being shifted closer to the rear in the F101 (highlighted in red) and shifted toward the front in the F102 frame (highlighted in blue)

All these modifications do not result in a saving in chassis weight; on average the chassis of F101 and F102 weigh 1.06..1.10 kg depending on the body.
– single rear shock absorber is a CVA in the Mini version.
– the rear structure of the F102 chassis that houses the motor, rear axle, differential box and suspension is the same as the F101 chassis. This subsystem consisting of 4 plastic parts is identified as part C number 0005371 and is found on Group C chassis, F101, F103 and F104
– as with the F101 chassis, to strengthen the rear structure there is a rhombus-shaped metal plate (part number 4305259) to which the motor is attached (right in the picture, plate and motor highlighted in gray). This rhombus-shaped plate is retained on all street chassis following the F101 and prevents breakage to the plastic C-shaped motor-holding plate.
– the front suspension is simple springs acting on the steering spindle echoing what was tested with the RM Mk5…7, Road Wizard and F101 chassis.
– the F102 family models feature rich Lexan body.
– the steering repeats the design of previous models: the steering arms have different lengths. This results in the radius of curvature on the right side being different from that on the left side.

-the front suspension arms are four because they are separated right-left side and upper-lower side. Part B part number 0005370 or spare part number 50387 is also used on the Group C chassis and the F101 chassis. Steering spindles (part number 0005059) share the Road Wizard, F101, F102, F103 and F104 chassis.
– the rims of the models equipped with the F101 chassis are very plain (right in the photo), in contrast that of the models equipped with the F102 chassis have spokes (left in the photo).

Re-release

The 58104 Mc Laren MP4/P Honda model was re-released for sale in 2011 under model number 84193, chassis F104W. Obviously, this model is more performance oriented than the original model, the most significant figure being the weight which has been reduced to 0.68 kg versus over 1.05 kg for the original model.
Broadly speaking, the F104W chassis takes up and extremes the same design concepts as the original model: FRP bottom plate, small top plate in the center-rear area, spring shock absorbers on the front spindle, single rear shock absorber and rear system housing engine-axle-differential. There are several improvements, and the most obvious is the position of the steering servo, which is centrally mounted in an upright position.

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