BSCRA HANDBOOK 2024

PART 3: Car Standards for all classes except INTRO 32   

Introduction

These Car Standards define the rules competitors and scrutineers need to work with.  Competitors may be interested to see the  policies which give information from which the BSCRA Competition Rule Committee decide what body shells, motors and chassis will be approved.   The policies are available on line (click on the links) but please remember it is these car standards say what is eligible, the policies are only provided to competitors and scrutineers for background information.

The rules for the INTRO 32 class are in Part 2 of the Handbook

This part of the handbook is split into rules which apply to all cars except INTRO 32 (Section A) and separate sections that give the rules that only apply to individual classes  (Sections B to H). They are applicable as follows:-

Part 3 Section A Car Standard applicable to all cars (except INTRO 32)

A1 Only bodies on the appropriate BSCRA approved body list may be used. The bodies may not be modified (unless specified in the approved body list).  NOTE The approved body list and list of non-approved bodies is published on the BSCRA web site.

 NOTE Manufacturers or suppliers who wish to have new bodies added to the list will submit the bodies to the BSCRA Competition Rules Committee. For more details see the BSCRA body approval policy.

A2. The body must be painted in at least 2 different colours.   Bodies must have major visible appendages, such as lights, intakes, engine detail, etc. must be shown in their correct positions and colours. Clear plastic bodies shall be painted. (This includes painting the body sides).  Moulded in wings must be realistic in appearance (either by black dividing lines, shadow, or contrasting colours).  Any requirements for specific bodies included in the approved body list are mandatory. 

A3. All cars must have transparent windscreens and windows as found on the prototype.

A4. All cars must have a driver securely fixed, and consisting of a minimum of head, shoulders, arms and top segment of the steering wheel joining the hands all appropriately coloured. These items must be 3 dimensional, not just painted on. 

A5 The body and fixings may be outside the chassis width limit (but there are some restrictions in Formula 1).

A6. No projections downwards capable of guiding the car, except for the guide blade, and pick-ups are permitted. Only one guide is permitted. The maximum permitted guide blade length is 28.5mm.

A7. The front wheels of all cars must make a minimum angle of 85 degrees with the track.  One-piece wheels and tyres shall have the appropriate part black. In all the closed wheel classes (that is classes 2-8 inclusive), 2 dimensional front wheels appropriately placed on the body are permitted instead of rotating front wheels.  These fronts must look realistic, including a black tyre and wheel detail (Not just a black circle!). These fronts may be stickers.  They must be a complete wheel and tyre and must be placed in the correct fore and aft position on the side of the body.

A8 Ground clearance and minimum tyre diameter rules apply at the start of a race.

A9. Silicon based tyres are not permitted.

 Part 3 Section B: Car Standards Applicable to 1/32 Formula 1 (Class 1) and F2 (Class 1A)

B1. Rear body details (e.g. gearbox and diffuser) may be omitted.

B2.  No part of the motor, chassis or gears (excluding axles and axle tubes) shall be visible when viewed from above or through the windscreen.

B3. There is no restriction on the type of drive, chassis or motor that may be used, or which wheels may be driven except that all cars shall be "in-line" i.e. the motor shaft shall be at right angles to the rear axle.

B4. The maximum width of the chassis is 34 mm except for the section no more than 68mm long between the trailing edge of the rearmost front tyre and the leading edge of the rear tyre where the maximum width is 52 mm. This limitation does not apply to scale engine or exhaust detail or suspension detail as found on the prototype. Suspension detail thicker than 1.6 mm rod or wire may result in disqualification. Suspension detail shall be in the correct position and may not be filled in with lead or other weights. Up to 4 body mounting pins will be allowed outside this 52mm limit.

B5. Vacuum formed plastic bodyshells only are permitted and these shall not exceed 1 mm in thickness at any point. No weights may be attached to the body so as to be outside the chassis width limit. The diagram above shows what can be cut out.

B6. Front Wheels must touch and roll on the track. Front tyres must be black.

B7. Unmodified GMS Devil chassis shall be allowed to race in Formula 1. The chassis width, and guide lead rules shall not apply to this chassis, but all other car standards in Sections A and B shall apply.

B8 The section of extra bodywork either side of the nosecone to cover the chassis shall be painted or marked in black or gray.

B9  Cars must carry a clearly legible racing number in at least one APPROPRIATE place

Car Standards Applicable to F2 (Class 1 A)

All the standards for Class 1 (1/32 Formula 1) apply except the permitted motor must be

1.1 JK Falcon  or TSR Falcon  or  JK Hawk 7 or  JK Hawk 7BB :
There are photos on the BSCRA web site

1 2 This is a sealed motor.  Any evidence of tampering i.e. opening, internal / external modification will deem the motor ineligible   Clarification - A comm cooler may be fitted.

2 Permitted Motor Modifications

2.1    Armature shaft may be shortened

2.2   The motor shaft diameter must be 1.95mm minimum and 2.05mm maximum (fitting smaller bore pinions is not permitted)  

Part 3 Section C: Car Standards Applicable to 1/32 Sports/GT (Class2)

C1 Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all rotating road wheels shall be visible from the side to at least wheel center height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All road wheels shall rotate. The outside edge of the front wheels shall be within 6mm of the outside of the chassis. Front tyres must be black.

     Alternatively 2 dimensional front wheels with a minimum overall tyre diameter of 14mm are permitted (see rule A7).

C2 The rear bodywork may be omitted only where:-

      a) The original car did not have rear bodywork.     OR

      b) The wing is the rearmost part of the bodywork.

C3 The body must be painted in at least 2 different colours. Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.

C4 No part of the motor, chassis,  gears or tyres shall be visible when viewed from above or through the windscreen or windows.

C5 There is no restriction on the type of drive, chassis or motor that may be used

Part 3 Section D: Car Standards Applicable to 1/32 Saloon (Class 3) and 1/32 National Club Team Championship Sports/GT cars (Class 5)

NOTE The difference between these two classes is the bodies, they are identical in other respects.

D1 General and Dimensions

D1.1 Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all rotating road wheels shall be visible from the side to at least wheel center height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All road wheels shall rotate. The outside edge of the front wheels shall be within 6mm of the outside of the chassis. Front tyres must be black.

     Alternatively 2 dimensional front wheels with a minimum overall tyre diameter of 14mm are permitted (see rule A7).

D1.2        The rear bodywork of Saloon bodies (class 3) , as fitted to the prototype, must not be omitted. The lower edge of the rear bodywork must not be more than 10 mm above the bottom of the chassis across its full width when measured on a recessed Tech Block. The Saloon height applies to the rearmost 10mm of the body.  The roof may exceed this height.  BSCRA may permit specific saloon bodies to exceed the rear body height limit, the approved body list states which bodies may exceed this height limit .

D1.3 The rear bodywork of Sports/GT (class5) bodies may be omitted only where:-

      a) The original car did not have rear bodywork.     OR

      b) The wing is the rearmost part of the bodywork.

      See the approved body list for this class

D1.4 The body must be painted in at least 2 different colours. Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.

D1.5 No part of the motor, chassis,  gears or tyres shall be visible when viewed from above or through the windscreen or windows.

D1.6 There is no restriction on the type of drive or chassis that may be used. However, in 1/32 Saloon, cars running to production class chassis & motor regulations, with saloon class body-shell regulations, shall be allowed to compete,  but limited to intermediate and clubman grade drivers

D2   Motors

D2.1          Permitted Motors / Manufacturers

D2.1.1      “C” Can Group 12 motors assembled from parts (see below) supplied by the following  approved manufacturers only:

Proslot / Champion - including 2005 versions (723 VIP and  728 SRS)

RJR

Mura -  including  2005 version

Koford  part no M408 , M408J - Super Feather M504A 

BOW #229B Magshifter 
 Viper  V506-2 and V506-2L 

USRA approved version of the Valiko armature

S&K armature 

Click here for more details of the eligible motors

Parts

Can

Armature

Magnets

Endbell

Brush gear

D2.1.2          Mixing of manufacturer’s parts is allowed.  This does not imply that all permitted parts will fit or work together. Parts are defined as Can, Armature       Magnets Endbell and Brush gear

D2.1.3   It is permitted to use motors  to the regulations for INTRO 32 (Falcon/Hawks) in cars using INTRO 32 or  Super production (class 4) chassis. 

D2.2          Permitted Motor Modifications:

D2.2.1      Free choice of screws, brushes and springs

D2.2.2      Brushes may be shunted

D2.2.3      Free choice of plain bearings for endbell

D2.2.4      Free choice of bearings (plain or ballrace) for can

D2.2.5      Magnets may be honed

D2.2.6      Magnets may be shimmed

D2.2.7      Magnet springs may be removed

D2.2.8      The magnet (axle side) may be notched to allow axle clearance

D2.2.9      The can (axle side) may be notched to allow axle clearance and the can may be braced on the axle side

D2.2.10    Material may be removed from the endbell and brush gear to allow chassis clearance   Brush Hoods may be modified to allow clearance for springs and shunts to have improved travel

D2.2.11  The motor regulations for class 4 (and not those in D2.2 and D2.3) apply to cars running to production class chassis & motor regulations.  

D2.2.12 There is a free choice of one piece full height ceramic magnets.   Bevelled magnets (other than the small bevels for magnet retention springs) are not permitted 

D2.3          Armature Specification

D2.3.1      Group 12 – minimum diameter 0.510", maximum diameter 0.518"

D2.3.2      Armatures may be reconditioned but not resized.  Reconditioning includes, cleaning, dying, commutator truing and rebalancing

D2.3.3     Armature shaft may be shortened, the motor shaft diameter may be reduced at the drive end.

 Part 3 Section E: Car Standards Applicable 1/32  Super Production (Class 4) 

NOTE There are two motor options (Falcon and Super Wasp)  see E3and E4 below.

E1 General and Dimensions

E1.1 Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all rotating road wheels shall be visible from the side to at least wheel center height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All road wheels shall rotate. The outside edge of the front wheels shall be within 6mm of the outside of the chassis. Front tyres must be black.

     Alternatively 2 dimensional front wheels with a minimum overall tyre diameter of 14mm are permitted (see rule A7).

E1.2 The rear bodywork may be omitted only where:-

      a) The original car did not have rear bodywork.     OR

      b) The wing is the rearmost part of the bodywork.

E1.3 The body must be painted in at least 2 different colours. Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.

E1.4 No part of the motor, chassis,  gears or tyres shall be visible when viewed from above or through the windscreen or windows.

E2 Permitted Chassis ( both classes) : 

E2.1 The following chassis only may be used:
    'Eurotoy II'
    'Parma International 32'
    GM Demon

    TWP "Euro toy" 

   CMG Slots 

   JK X32 2 piece chassis

E2.2 Permitted chassis modifications

E2.2.1      Rear axle bearing holes may be enlarged to aid oilite fitting / location

E2.2.2      Rear axle bearings may be soldered or glued in place

E2.2.3      The body may be secured to the chassis in up to four positions.  For this purpose only, up to four pin tube pieces may be added by gluing or soldering to the chassis, in or vertically above the positions intended by the chassis design.  (Wording of this paragraph clarified December 2004)

E2.2.4      The motor bracket hole may be enlarged for motor bearing clearance but the outside profile of the bracket shall remain unchanged

E2.2.5      Lead ballast may be added by gluing to the top side of the chassis only

E2.2.6      Front wheels may be fitted in any way in order to conform to the dimensional requirements of the class i.e. positioning relative to the outside of the chassis

E2.2.7      The rear axle bearing supports may be braced with piano wire (glued or soldered) but no bracing shall extend beyond the rear of the chassis

E2.2.8      The motor bracket may be braced with piano wire (glued or soldered) but no bracing shall extend outside the chassis

E2.2.9      The motor may be fixed in place with piano wire braces (glued or soldered)

E2.2.10     GM Demon - The tags at the front of the pan section may be bent from vertical to horizontal

E2.2.11     GM Demon - A wire brace may be soldered across the pan upstop.  This wire must be a single straight piece of piano wire a maximum of 1.6mm diameter and maximum 22mm in length and may be soldered to the side rails only

E2.2.12     GM Demon and Parma International 32 - The front axles may be cranked and pass through the holes pivoting the pans.

E2.2.13     Eurotoys - The chassis screws may be fixed in place with glue or solder

E2.2.14    Self adhesive plastic or fabric tape may be used to adjust ride height and level the two chassis parts and/or to limit the relative movement of the two chassis parts and/or to prevent lead wires falling through chassis holes on to the track surface and/or prevent the chassis shorting the track tape or track braid.

E2.3      Chassis Construction Restrictions

E2.3.1     Solid rear axle only

E2.3.2     Plain axle bearings only.  Maximum of two allowed

E2.3.3     The minimum axle height when measured from the underside of the chassis to the top of the axle shall be 8.4mm on cars with 2mm axle, 8.6mm on cars with 3/32” axle and 9mm on cars with 1/8” axle

E2.3.4     a For 2 piece chassis, the original method of joining the two chassis pieces together shall be used
 b Single piece    chassis shall be assembled by adhesive or solder using only the kit parts provided in the original reference design.

E2.3.5     Nothing is allowed to be added to the chassis in front of the forward most part of the motor unless otherwise stated in section E.2.2.    (Wording of this paragraph clarified December 2004)

E2.3.6     The original motor bracket in its original position must be used driving gearing on the intended side

E2.3.7     JK X32 chassis for Super Production class: A small amount of material may be removed to facilitate installation of Wasp/Hornet Super Production motors as follows

(A) The front and rear edges of the motor hole may be chamfered to match the side profile of the motor can/endbell as long as the bottom edge of the hole is not extended forward or backwards.

(B)  A small amount of material may be removed from the lower flange of the right hand rear bearing holder, to clear the brush gear of the motor.

(C) The left hand end of the motor hole, looking forwards from above, where the can end of the motor is mounted, may be trimmed slightly to allow the can to fit squarely and provide further clearance at the brush gear (See illustrations)

(D) The motor brush hoods and springs may have a small amount of material removed to provide clearance to the chassis. (See illustrations)

(E) For avoidance of doubt, a chassis with these minor modifications may also be used with a Falcon motor installed, for Production class (i.e. there is no need to buy another one just to enter a Falcon race).

E2.3.8      JK X32 chassis for Production or Super Production :  The 64mm width regulation applies in these classes. Due to the manufacturing techniques, chassis may be delivered with the pan spread slightly at the rear so as to exceed the 64mm limit. The following methods only, are permitted to rectify this: 
Any or all of;

(A) Take the pan off, squeeze it inwards so it meets the 64mm width limit, deburr the lateral stops on pan and centre section and correct their bends to 90 degrees then refit the pan. (See illustrations)

(B) Material may be removed from the pan edges so as to bring the chassis within the width limit. Material removal shall be from the horizontal flat edges only, the body mount flanges shall not be modified.

E2.3.9 The manufacturing processes of some chassis mean that some parts are delivered with quite sharp edges. It is permissible to deburr these edges. This must not result in excessive material removal and any such edge radius must not exceed 25% of the sheet material thickness.

E2.3.10   It is not permitted to undertake post manufacture heat and/or chemical treatments and/or shot peening to Production chassis components (Centre sections or Pan sections). Detailed explanation

E 2.3 11 Rules for one piece chassis

A Due to the manufacturing process sharp edges protruding above the main surface areas may be present – these edges may be removed such that the chassis kit upper and lower surfaces are visually flat.

b Aesthetic ‘dressing’ of the chassis surfaces is permitted such that up to 0.02mm maximum material removal

d Kit parts shall not be modified from the original reference design unless specified in section E2.2. Modification is defined as:

Reshaping of any part by removal of material.

Reshaping of any part by addition of material.

Replacement of kit parts with parts manufactured by anyone other than the original manufacturer.

Back axle      bushes must be concentric and mounted in the standard pillow block holes

E4.2.12 The rear of the Super Wasp motor can/magnets may be notched for axel clearance

E3         Falcon / Hawk Powered Cars

E3.1          Permitted Motors

E3.1.1   JK and TSR Falcon  up to and including Falcon V11 /  Falcon 7 :  JK Hawk Retro :   JK Hawk 7 :  JK Hawk 7BB :         Click here for more details of the eligible motors

E3.1.2   This is a sealed motor.  Any evidence of tampering i.e. opening, internal / external modification will deem the motor ineligible   Clarification - A comm cooler may be fitted.

E3.2.2          Permitted Motor Modifications

E3.2.2.1    Armature shaft may be shortened

E3.2.2.2   The motor shaft diameter shall be 1.95mm minimum and 2.05mm maximum (fitting smaller bore pinions is not permitted)  

E4      Super Wasp Powered Cars

E4.1      Permitted Motors / Manufacturers

E4.1.1   Complete “C” can motors supplied by the following USRA approved manufacturers only:

Proslot -  including 2005 versions (723 VIP and  728 SRS)

RJR

Mura  - including 2005 version  

BOW "Magshifter" Stinger 

Viper  V594-2 and V594-2L 

Koford Super Wasp 

Click here for more details of the eligible motors

E4.1.2   Mixing of manufacturers' parts is allowed.

E4.1.3   Parma and Slotworks 16d, super 16d are also permitted. (Please note the policy for this type of motor is under review)

E4.1.4   Motors eligible for Production (Class 4)- (see above) are also eligible for Super Production (Class 4A)

E4.2      Permitted Motor Modifications:

E4.2.1   Free choice of screws, springs and brushes

E4.2.2   Brushes may be shunted

E4.2.3   Free choice of plain bearings for endbell

E4.2.4   Free choice of bearings (ball race or plain) for can

E4.2.5   Magnets may be honed

E4.2.6   Magnet springs may be removed  

E4.2.7   It is accepted  that can to endbell screws may be changed for other types or completely omitted as long as no significant performance change results. This is often done to salvage worn holes or to provide chassis clearance. The following are permitted;

(A) ‘Pin tabs’ may be replaced by screws (applicable to older Mura motors)

(B)  Screws may be made of any material and of any thread and head profile.

(C) Holes may be enlarged or countersunk sufficiently to accommodate the screw.

E4.2.8  The motor brush hoods and springs may have a small amount of material removed to provide clearance for the JK X32  chassis. (See illustrations)   Brush Hoods may be modified to allow clearance for springs and shunts to have improved travel .  Motors modified in this way can be used on other chassis.

E4.2.9 There is a free choice of one piece full height ceramic magnets.   Bevelled magnets (other than the small bevels for magnet retention springs) are not permitted,  

E4.3     Armature Specification

E4.3.1    Wasp, Hornet, Super Wasp – minimum diameter 0.510", maximum diameter 0.518"

E4.3.2     Armatures may be reconditioned but not resized.  Reconditioning includes, cleaning, dying, commutator truing and rebalancing

E4.3.3      Armature shaft may be shortened

Part 3 Section F: Car Standards Applicable to 1/24 Open Group 12 (Class 6)

F1 General and Dimensions

F1.1 Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all rotating road wheels shall be visible from the side to at least wheel center height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All road wheels shall rotate. The outside edge of the front wheels shall be within 6mm of the outside of the chassis.

        Alternatively 2 dimensional front wheels with a minimum overall tyre diameter of 15mm are permitted (see rule A7).

F1.2 The rear bodywork may be omitted 

F1.3The body must be painted in at least 2 different colours

F1.4 Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.

F1.5  No part of the motor, chassis,  gears or tyres shall be visible when viewed from above or through the windscreen or windows.

F1.6. Gears are free, but  they must not protrude below the underside of the chassis.

F1.7  There is no restriction on the type of drive or chassis that may be used

F.2 Motors

F2.1          Permitted Motors / Manufacturers

             Only “C” Can Group 12 motors using any BSCRA approved C can motor components from the following manufacturers are permitted

Proslot / Champion - including 2005 versions (723 VIP and  728 SRS)

RJR

Mura   - including 2005 version

Koford  part no M408 , M408J and the earlier Koford "Feather"  Super Feather M504A

Kelly / Red Fox

Camen/TWP

Hershman / Fastones  

BOW #229B Magshifter

Cahoza 230 and 231, UL Can, part number #232

Kamen K101 setup 

Viper  V506-2 and V506-2L 

USRA approved version of the Valiko armature

S&K armature 

 Click here for more details of the eligible motors

F.2.2        Permitted Motor Modifications

F2.2.1      Free choice of screws, springs and brushes

F2.2.2      Brushes may be shunted

F2.2.3      Free choice of bearings (plain or ballrace) for endbell

F2.2.4      Free choice of bearings (plain or ballrace) for can

F2.2.5      Magnets may be honed

F2.2.6      Magnets may be shimmed

F2.2.7      Multiple magnets may be used.

F2.2.8      Magnet springs may be removed

F2.2.9      Magnets may be cut down in height and shortened

F2.2.10    The magnet (axle side) may be notched to allow axle clearance

F2.2.11    The can (axle side) may be notched to allow axle clearance and the can may be braced internally on the axle side

F2.2.12     Material may be removed from the endbell and brush gear to allow chassis clearance Brush Hoods may be modified to allow clearance for springs and shunts to have improved travel

F2.2.13     Aluminum endbells may be used

F2.3          Armature Specification

F2.3.1      Group 12 – minimum diameter 0.500", maximum diameter 0.518"

F2.3.2      Armatures may be reconditioned but not resized.  Reconditioning includes, cleaning, dying, commutator truing and rebalancing

F2.3.3       Armature shaft may be shortened

Part 3 Section G Car Standards applicable to 1/24 Euro sport (Class 7)

G.1 Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all rotating road wheels shall be visible from the side to at least wheel center height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All road wheels shall rotate. The outside edge of the front wheels shall be within 6mm of the outside of the chassis.

        Alternatively 2 dimensional front wheels with a minimum overall tyre diameter of 15mm are permitted (see rule A7).

G.2 The rear bodywork may be omitted 

G.3 The body must be painted in at least 2 different colours

G.4 Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.

G.5  No part of the motor, chassis,  gears or tyres shall be visible when viewed from above or through the windscreen or windows.

G.6. Gears are free, but  they must not protrude below the underside of the chassis.

G.7  There is no restriction on the type of drive, motor or chassis that may be used

 Part 3 Section H Car Standards applicable to 1/24 Production Saloon (Class 8)

H1 General and Dimensions

H1.1 Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all rotating road wheels shall be visible from the side to at least wheel center height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All road wheels shall rotate. The outside edge of the front wheels shall be within 6mm of the outside of the chassis.

        Alternatively 2 dimensional front wheels with a minimum overall tyre diameter of 15mm are permitted (see rule A7).

H1.2The body must be painted in at least 2 different colours

H1.3 Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.

H1.4  No part of the motor, chassis,  gears or tyres shall be visible when viewed from above or through the windscreen or windows.

H1.5  The height of the body when measured from the bottom of the chassis (measured using a recessed tech block) shall be either.-

(a) A minimum of 15 mm to the top of the vertical part of the moulded front wheel arch.

OR

(b) A minimum of 18 mm to the centre of the bonnet over the front wheel centre line.

H1.6  The rear bodywork, as fitted to the prototype, must not be omitted. The lower edge of the rear bodywork must not be more than 12.7 mm above the bottom of the chassis (measured using a recessed tech block) across its full width.. The Saloon height applies to the rearmost 15mm of the body.  The roof may exceed this height.  BSCRA may permit specific saloon bodies to exceed the rear body height limit, the approved body list states which bodies may exceed this height limit .

H1.7  The front wheels shall be rigid.

H1.8 Gears are free, but  they must not protrude below the underside of the chassis.

H2 Permitted Chassis

H2.1. Only the following  metal chassis of one material are permitted.:-

    Parma Flexi car 

    Parma Flexi-2  

    Parma Flexi-3  

    Parma Flex 4 

    Trinity Spyder' (with or without guide loop)

    Champion Astro'

'    Champion Turbo Flex'

    'JK. Cheeta.'

    JK X24 2 piece chassis 

    JK X25 2 piece chassis 

    JK X21 2 piece chassis 

    JK C43 Cheetah Aeolos 

    RJR Storm

    Mossetti Titan and Mossetti Titan SS 

    Mossetti Patriot Striker 2 Piece ALL STEEL chassis part no. MR1002 : Patriot “Avenger” chassis with heavy weight steel pans - part number MR 3002 :  Patriot “Avenger X” chassis with heavy weight steel pans  - no uprights part number MR 3102

    ProSlot SpeedFX (including PS-5000 and PS-5001 SpeedFX C-and  D-Can Chassis, PS-5002 and PS-5003
                      Standard and medium steel pans BUT NOT the aluminum pans (PS5004)) 

    Mid America Gemini - Either a 1.2mm diameter unmodified  Mid America " T bar" or a 0.8 mm diameter unmodified  Mid America   " T bar"  and sleeve tube must be used to join the chassis parts by passing through the holes intended for that purpose.  There are two versions -  plated                             and unplated., both are approved for racing

   Mossetti “Patriot Avenger Air” chassis, part number MR- 3203 with Heavy Plus steel pans, (it is only be eligible in that configuration). eligible. from 22 February 2024

NOTE The 4 1/2 inch wheelbase versions of chassis are not eligible. 

           Versions of these chassis with light alloy pans are not permitted

H2.2      Permitted Chassis Modifications

H2.2.1      Rear axle bearing holes may be enlarged to aid oilite fitting / location

H2.2.2      Rear axle bearings may be soldered or glued in place

H2.2.3      Up to four pin tube locations for body mounting may be added by gluing or soldering, in or above the original positions

H2.2.4      The motor bracket hole may be enlarged for motor bearing clearance but the outside profile of the bracket shall remain unchanged

H2.2.5      Lead ballast may be added by gluing (or soldering) to the top side of the chassis only

H2.2.6      Front wheels must be rigid and have a minimum diameter of 15mm.  Front wheel retainers may be soldered in place

H2.2.7      Front axle may be soldered or glued at chassis mounting points

H2.2.8      The rear axle bearing supports may be braced with piano wire or steel ‘U’ bracket (glued or soldered)

H2.2.8      The motor bracket may be braced with piano wire or steel ‘L’ piece (glued or soldered) and used for the purpose intended i.e. to mount the motor to drive gearing to the intended side via a pinion fixed to the armature shaft at the can end of the motor

H2.2.9      The motor may be fixed in place with piano wire braces (glued or soldered)

H2.2.10    Parma FlexiKar and Parma 2 – Hot wing permitted  

H2.2.11    Self adhesive plastic or fabric tape may be used to adjust ride height and level the two chassis parts and/or to limit the relative movement of the two chassis parts and/or to prevent lead wires falling through chassis holes on to the track surface and/or prevent the chassis shorting the track tape or track braid.

H2.2.12 The manufacturing processes of some chassis mean that some parts are delivered with quite sharp edges. It is permissible to deburr these edges. This must not result in excessive material removal and any such edge radius must not exceed 25% of the sheet material thickness.

H2.2.13   It is not permitted to undertake post manufacture heat and/or chemical treatments and/or shot peening to Production chassis components (Centre sections or Pan sections).    Detailed explanation   

H2.2.14   On the JK C43 chassis 0.8 to 1.2mm diameter unmodified JK " J bars" must be used to join the chassis parts by passing through the holes intended for that purpose.    

H2.3      Chassis Construction Restrictions

H2.3.1      Solid rear axle only

H2.3.2      Plain axle bearings only.  Maximum of two allowed

H2.3.3      The minimum axle height when measured from the underside of the chassis to the top of the axle shall be 8.4mm on cars with 2mm axle,  8.6mm on cars with 3/32” axle and 9mm on cars with 1/8” axle

H2.3.4      Original method of joining the two chassis pieces together shall be used

H2.3.5      No bracing is allowed in front of the forward most part of the motor unless otherwise stated in section H2.2

H2.3.6      The original motor bracket in its original position must be used driving gearing on the intended side  

H.3       Motors

H3.1       Permitted Motors / Manufacturers

H3.1.1      Complete “C” can motors  and “C” Can Group 12 motors assembled from parts supplied by the following approved manufacturers  are permitted.   This does not imply that all permitted parts will fit or work together.    Complete motors listed in  H3.1.2 are also permitted.

Proslot  / Champion - 2005versions (723 VIP and 728 SRS) 

RJR

Mura – inclding  2005 version

Koford  part no M408 , M408J, Super Feather M504A and earlier Koford "Feather"

BOW #229B Magshifter              

Viper  V506-2 and V506-2L

Kelly / Red Fox : Camen/TWP

Hershman / Fastones

Cahoza 230 and 231, UL Can, part number #232

Kamen K101 setup 

USRA approved version of the Valiko armature

S&K armature 

Click here for more details of the eligible motors

H3.1.2     16d / Super 16d,  Falcons and other lower performance motors  may be allowed  at the organizer's discretion. (See British Open Championship Rules for eligibility of such motors in the BOC.)  

H3.2    Permitted Motor Modifications

H3.2.1      Free choice of screws, springs and brushes

H3.2.2      Brushes may be shunted

H3.2.3      Free choice of bearings (ball race or plain) for endbell

H3.2.4      Free choice of bearings (ball race or plain) for can

H3.2.5      Magnets may be honed

H3.2.6      Magnet springs may be removed

H3.2.7      The motor shaft diameter shall be 1.95mm minimum and 2.05mm maximum (fitting smaller bore pinions is not permitted)

H3.2.8      The magnet (axle side) may be notched to allow axle clearance

H3.2.9      The can (axle side) may be notched to allow axle clearance and the can may be braced on the axle side

H3.2.10    Brush Hoods may be modified to allow clearance for springs and shunts to have improved travel

H3.3    Armature Specification

H3.3.1   Group 12 – minimum diameter 0.510", maximum diameter 0.518"

H3.3.2    Armatures may be reconditioned but not resized.  Reconditioning includes, cleaning, dying, commutator truing and rebalancing

H3.3.3     Armature shaft may be shortened

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