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D3 2007 1/24 Retro F1 racing class rules (version V3,
12-20-07)
1. Intent:
The intention of this class is to provide a class of scratch-built slot cars
reflecting the spirit of the mid-1960s racing era, with scale realism and low
cost, to attract new and experienced racers and builders.
2. Dimensional Specifications
2a. Maximum Overall Car Width: 3.25" (measured across front or rear axle)
2b. Maximum Rear Tire width: 0.800"
2c. Minimum Rear Tire diameter: 0.8125" (13/16")
2d. Minimum Front Tire width: 0.225"
2e. Minimum Front Tire diameter: 0.75" (3/4")
2f. Minimum Clearance: 0.050" (measured under rear axle including gear),
0.040" under motor can at mounting bracket
and 0.015" (measured under front axle). All clearances measured with car
standing on a flat tech board on its wheels, without guide.
2g. Maximum chassis width excluding front axle carrier as defined in 2h. :
1-3/8"
2h. When seen from above, the front axle
carrier and/or any simulated suspension cannot be wider than 0.75" at its point
of contact with the chassis, and no wider than 0.25" at its point of contact
with the front wheel. The design of the simulated arm, made of plate and/or wire
must fit inside a triangle created by these parameters. Additional cosmetic
simulated wire or tubing radius rods attached to the wheel hub carrier are
allowed, but their point of contact with the chassis cannot extend more than
1.5" ahead or behind the centerline of the front axle.
2i. No part of the chassis may extend beyond the center of the rear axle by more
than 1".
3. Chassis construction:
3a. Chassis type: Any personally-built or commercially available scratch-built
chassis conforming to these specifications and to the spirit of the intent
statement is allowed.
3b. Chassis Materials: Brass sheet, rod and tube, steel wire, pin tubing and
guide tongues are allowed. A three-sided motor bracket including rear axle
carrier is mandatory. The motor must be attached to the bracket with no less
than two machine-screws. Other than guide tongues, stamped steel parts and EDM
or laser-cut parts of any material are not allowed
unless submitted for approval.
3c. Drive type: Inline drive only, with the motor shaft at 90 degrees to the
rear axle as viewed from above.
3d. Other than a drop arm, all hinged movements must be oriented in only one
direction (i.e. either side pan hinges OR a plumber hinge, NOT BOTH,
meaning that a "loose" hinge may not provide movement in
more than one direction). Centerline hinges (flexi hinges) are not
allowed. No chassis movement, dynamic or induced, may
extend the overall chassis width to more than 1-3/8".
3e. Front axle: A single straight, round
3/32" minimum-diameter one-piece front axle is
required, carrying both front wheels. The axle may be fixed or in a tube.
Small flats can be ground only in three places for
setscrew location. NO hinged front wheel movements are allowed (i.e.
no "L" arms). Front wheels may rotate independently.
3f. Guide: One guide flag centered on the longitudinal axis of the chassis (i.e.
no sideways "free float" or offset) is allowed.
3g: No on-board automatic liquid dispenser of any kind is allowed.
4. Motor rule:
4a. Motor type: Unopened, unmodified TSR D3 or Falcon
VII motor.
Exclusion Clause: Clear violation of motor-tampering rule will result in
permanent exclusion from any Division III participation in any form.
Example of car for this class:
5. Body rules
5a. Body style: Bodies must be originals or exact
reproductions of pre-1970 inline Open-Wheel car racing bodies by Lancer.
Bodies must be presentably painted and carry at least three racing numbers, one
on each side, and one on the front. No part of the chassis, at the exception of
scale-appearing suspension or other cosmetic devices may be seen when looking on
the car from above.
Example of car for this class:
5b. Approved bodies listing:
Bodies must be
molded from material with a minimum thickness of 10 thousands of an inch.
Lancer LAN-974 Eagle-Ford
Lancer LAN-975 Lotus 49-Ford
Lancer LAN-976 MATRA
Lancer LAN-980 Ferrari
Lancer LAN-981 Cooper-Maserati
Dynamic ELEB-022 Eagle-Weslake
Lancer Lotus T56
NOTE: Extra-wide Lancer and Dynamic bodies manufactured
for use on angle-winder cars in 1969 are NOT allowed.
5c. No air-control devices may be added to the bodies. Bodies must be
presentably painted and carry at least three racing numbers, one on each side,
and one on the front. No part of the chassis, at the exception of
scale-appearing suspension or other cosmetic devices may be seen when looking on
the car from its top.
5d. Cockpit: Cockpits must be fully opened following
the natural line of the windscreen and body. A separate 3-D driver figure
painted in at least 2 colors must be fitted.
Any matter regarding this class must be submitted in writing to Division III
Committee member Philippe de Lespinay
