F101

At first this frame has no unique identification, later it is named F101 to distinguish it from its evolution frame F102; F101 represents the highest level of technology at the time of release for sale and is the logical evolution of the Road Wizard frame and is the basis for all following F10x frames. Four models are equipped with the F101 chassis:

– Ferrari F189 Late Version, model number 58084, released for sale in 1990 and available on the market until 1994,
– Tyrrell 019 Ford, model number 58090, put on sale in 1990 and available on the market until 1994,
– Lotus 102B Jubb, model number 58095, put on sale in 1991 and available on the market until 1993, and
– Jordan 191, model number 58103, offered for sale in 1991 and available on the market until 1994

Translated with DeepL.com (free version)

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 of Ferrari F189 model number 58084 and Tyrrell 019 model number 58090evidences how, in contrast to the past, these models have many parts in common and there have been no particular technical evolutions.

The models differ in body, front and rear wing shape. 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 four different front wings of the Ferrari F189, Tyrrell 019, Lotus 102B and Jordan 191.

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 wing of the Ferrari F189 which is the same as that of Tyrrell 019, Lotus 102B and Jordan 191.

The main features of this chassis are:

– new ball-bearing rear differential that replaces the one used to date in on road model which was geared; this is a step forward from the point of view of track car design that will be taken up later in all models as Group C chassis and the F10x series

– new FRP bottom plate divided into two sections with a load-bearing function and to cushion the roughness of the ground. The shape of the frame echoes the design philosophy of the second version of the Road Wizard frame: an evolved damping system at the rear and a stiffer front end improves riding precision and road holding. The frame lacks the reinforcing plate found on the Road Wizard and is composed of two parts: front frame and rear T-shaped structure
The F101 frame has a constant height of 7 mm, the wheelbase of the F101 frame is 260 mm which is 10 mm longer than that of the Road Wizard family. Road Wizard frame highlighted in blue and F101 frame highlighted in red.

– single rear shock absorber is a CVA in the Mini version.
– the rear structure of the F101 chassis that houses the motor, rear axle, differential box, and suspension evolved from the structure in use in the Road Wizard chassis. This system formed by two C-plates has undergone several evolutions:
it was first introduced on Racing Master 1-2-3-4 models with C-plates and tubular metal crossmembers (left image for Racing Master 2),
it was evolved in form on Racing Master models 5-6-7 with metal C-plates and flat metal or FRP crossbars (center image for Racing Master 7), and
a further evolution can be found on the Road Wizard chassis with C-shaped plates and plastic upper crossmember strengthened by a tubular metal lower crossmember (right image).

The new system developed for the F101 frame brings together all previous experience by ensuring light weight and torsional strength; it consists of:
two plastic C-shaped plates that change slightly in shape from those of the Road Wizard frame, and
two novel plastic crossbars (left in the picture). This subsystem composed of 4 plastic parts is identified as part C number 0005371 and is found on Group C, F102, F103 and F104 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 image, plate and motor highlighted in gray). This rhombus-shaped plate is retained on all street frames following the F101 and prevents breakage to the plastic C-shaped motor carrier plate. Problem that plagues the solution developed on the Road Wizard chassis.

– the front suspensions are simple springs acting on the steering spindle echoing what was tested with the RM Mk5…7 and Road Wizard chassis.
– the F101 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 left-right side and upper-lower side. Part B number 0005370 or spare part code 50387 is also used on the Group C chassis. This suspension system completely changes shape from the Road Wizard chassis where the suspension was divided into two parts: the lower part includes the wing and suspension arms, and the upper part is the suspension arms. The steering spindles (part number 0005059) share the Road Wizard, F101, F102, F103 and F104 chassis.

Re-release

Model 58095 Lotus 102B Jubb was re-released for sale in 2012 under model number 84287, chassis F104W. Obviously, this model is more performance oriented than the original model, the most significant figure being the weight which was 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 motor-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.

Tamiya, original figure, box art, guide book and catalogue are of TAMIYA INC, which does not endose or sponsor www.tamiyaclassic.com. Any brands, logos and trademarks represented on this website are the copyright of their respective owners.