2012 Scratchbuilt Chassis Proxy

[Sports Racer]

This race is for Group 5 cars from 1976 to 1982.

All races to be on routed tracks.1st race to be held in April 2012. 8 races (1 per month) across Australia with the final race held in November 2012.

Chassis must be homemade, no modifying a production chassis.

Bodies must be either injection-molded 'hard' plastic or resin or fiberglass. Please check with the organisers if you wish to use a body made from other materials; however vacuum-formed bodies are not permitted. Appendages such as on the real car (e.g. spoilers and diaplanes) may be painted Lexan or other lightweight material.

Fantasy liveries are allowed.

Body must be mounted securely but can float.

All cars must carry 3 numbers on the car, one on each side and one on the front.

All bodies must contain interior tray of plastic or styrene a minimum 10 thou thick comprising a three dimensional driver with head, shoulders, arms and a steering wheel. Vac formed windshields and interiors are permitted.

The body must fully enclose the chassis, running gear, guide and braid when viewed from above. Maximum body width is 2 5/8" (67mm).

Maximum width measured from the outside edges of the wheels must not exceed 2.5", regardless of the dimensions of the real car.

Minimum ground clearance is 1/16".

Chassis may be of any design, inline, sidewinder, anglewinder or front mounted inline, and made from any material but no laser or EDM-cut components, other than guide tongue and axle pillow-blocks, may be used. Pre made rear axle brackets are permitted. Chassis may be made out of brass, copper, fiberglass, molded plastic, Carbon Fiber, wood, resin, laminated composition, piano wire may be used in the chassis.

The chassis MUST BE SOMETHING THAT CAN BE BUILT IN THE HOME WORKSHOP.

No modified commercial chassis permitted, this is a scratch built proxy race.

Only one guide flag may be used.

Ball bearings are NOT permitted.

Any commercially available 1/32 scale motor can be used however cobalt magnets are not permitted. The motor must be the same type for each track. No changing to a hotter motor for the faster tracks. The motor may be replaced at any time with another of same spec

Wheels must contain hub inserts appropriate for the car being modeled and the period unless the wheel has a design to make it look like a real wheel.

Tires - Minimum front tire diameter will be 18mm (.700) Minimum width of 7mm. Minimum rear tire diameter will be 19mm. Maximum tread width of 14mm. All tyres must be black, either Urethane or Rubber. No silicone tyres, no spongies.

Eligible cars include but not restricted to:

Porsche 935 (includes the 935-77, 935-78 known as the Moby-Dick and the customer Kremer K3 and K4 and the JLP variation)
BMW 320i Turbo
Toyota Celica LB Turbo (RA22) (1st generation)
Dome Celica Turbo (RA45) (2nd generation)
TOM'S Corolla G5 (A40)
Nissan Skyline RS Silhouette Formula
Nissan Nichira Impul Silvia (two nose variations)
Mazda RX-7 252i
Mazda RX-7 253/253i/253SR
Mazda RX-7 254/254i
Nissan Bluebird SSS Turbo
BMW 3.0 CSL
BMW M1
Lancia Stratos Turbo
Lancia Beta Montecarlo Turbo
Ferrari 512BB LM
Zakspeed Ford Capri Turbo
Ford Escort Zakspeed
Zakspeed Lotus Europa Gr.5
Greenwood Widebody Corvette

If these rules look familiar they are, I borrowed them off Phil K from the scratchbuilt proxies he used to organise a few years ago, with a few changes to update the race into 2012.

Cheers

Paul


Sports Racer ----- paid
chenglaw -------- paid
manimmal
neil
brk12345
BMR
Mohawkk
slo1quick
rsclio
mmmoose -------- paid
MRollingthunder -- paid
HarVWallbanger
redlynr
MobyDick
Ecurie Martini
Biedmatt ---------- paid
alexis in greece
gascarnut
rixvette
1/32 slotter
MNewns ---------- paid
o3raledale -------- paid
hgpanel ---------- paid
R Blythe --------- paid
A Barford -------- paid

R Blyth has paid but I don't know your SCI name.

[Wet Coast Racer]

Hmmm I'm tempted to ask for a definition of 'scratchbuilt'. Does an HRS/2 count? And what about the BMW 3.5 CSL? I have 1 that could become 111 with the application of a couple of decals.

[mmmoose1]

Thanks Paul for enticing me into another proxy. Any photos of the tracks involved?

Ken

[Phil Kalbfell]

Does an HRS/2 count

The chassis MUST BE SOMETHING THAT CAN BE BUILT IN THE HOME WORKSHOP.

I think you would need some moulds and an injection moulding machine in your workshop!

[Sports Racer]

Here's what I've got so far.

Beachside Model Raceway - Southern area of Adelaide
26.75 metres around the shortest lane 27.05 around the longest lane (4 lanes)
2 x 40 amp power supplies - Adjustable power level can be set from 2 volts to 17 volts
Races usually run at 12 volts -
4 lanes MDF timber routed track - Copper braid
100mm lane spacing minimum
150mm spacing on the sweeper at the end of the main straight
Plenty of run off area to keep deslotted cars out of harms way until the marshal does his job.
Dead strip timing to SRM 2.30 program
Enoch grey Ferrodore
Its a fast open layout that suits the faster cars
From the start line
The main straight is 7.5 inside lane - 8.2 metres outside lane then a long 4.6m (outside lane) right hand turn through a wide sweeper (the lane spacing splays out into 150mm so over taking can be done easily while all the cars are sliding) , then as it exits onto the back straight the track sweeps back left into a 1.8m "s" reversing the slide from the right hand sweeper into the left hand uphill climb ,into a 4.5 metres straight then it has to brake hard into a 180 corner , next a short 1.2m straight into a right / left slide under brakes around another 180 corner then 2m straight leading to the bridge underpass . Then through a 30 degree kink under the bridge.out the another side turning left into a 2 metre ( inside lane ) 3.5m (outside lane )sweeping corner that tightens up at the end to go left over the bridge then a right turn with a slight off camber feel to it as it enters the main straight and over the finish line.
The motor spends a lot of time in its higher rpm limit using the usual 3:1 ratio 9:27 gearing (inline) or 3.8:1 10:38 sidewinder type gearing . The track has a few sweeping corners that require the car to stay in a constant slide and remain stable .
The braid sits 1/2mm below the track surface.
Forgot .. track slot ( 8mm deep 1/8th wide )

As for controllers , everyone that races at my place has gone fully adjustable brakes , ohms and voltage

tyres ... I always run MJK but some have run slot it F15s - F22s and had better lap times - the local club still debates whether those " F " tyres were treated before the racing started

Lap times ... lotsa lap times have been posted about my track on auslot that cover a lot of different car types both 1/32 and 1/24th a good place to start is my round of the 2008 proxy cars , there is a good run down of what worked on my track and what didnt regarding the proxy entries that year and a video that should still play





lap length - 15m
slot depth - 7.5mm
OK for wood guide? Yes, No problems with ninco pro guide. But I do have a problem with the thickness of carrera. I will work on that over xmas
braid or tape - braid
in the case of braid what the recess is (flush with the surface or below) - flush
surface paint - Raw ferrodor
what power supplies and controllers are being used - Slot.it controller
best tyre brand(s) that suit the track - Best would be Slot.it F series or NSR (but i doubt these would last the whole series) Slot.it P6 & MJK run good as well and would be my pick.
lap time for quick cars - from 5.5s





Canberra Way2fast

8 lane commercial track
Track surface - Ferrodor
Power supply - 40 amps
Controllers - Professor motor
Best tyres - Slot.it F22 but these go off after 5 minutes racing. Recommended Slot.it F30, MJK or NSR Ultra. Ninco also work.





Melbourne Model Raceway
length approx 18m
wood guide ok
braid - flush
ferrador surface
power source, not sure but easily adequate
controllers 45ohm turbo supplied, but drivers own throttles will be used
outright lap record @14v 2.9, nsr mosler. More likely the quick proxy cars will be doing 3.5 @12v
Silicons are banned, and although rubber tyres such as brm or slot.it raptors provide the most grip, it tends to be a majority rules kind of track, ie if it's mostly urethane, the brm's etc just don't work.






Newso's track

Track is flat enamel painted surface, braided, each lap is 16.5 metres and timing system is Trackmate.

[redlynr]

Furthering Paul's question... Can a slot.it pod be used in said scratchbuilt chassis? Can SCC axle blocks be used?

[Robert Livingston]

"Chassis may be of any design, inline, sidewinder, anglewinder or front mounted inline, and made from any material but no laser or EDM-cut components, other than guide tongue and axle pillow-blocks, may be used. Pre made rear axle brackets are permitted. Chassis may be made out of brass, copper, fiberglass, molded plastic, Carbon Fiber, wood, resin, laminated composition, piano wire may be used in the chassis.

"The chassis MUST BE SOMETHING THAT CAN BE BUILT IN THE HOME WORKSHOP.

"No modified commercial chassis permitted, this is a scratch built proxy race."

I'm thinking these rules mean no complete HRS2's allowed, but you can use SCC set-screw front axle blocks, and any commercially sold form of rear axle-to-motor bracket. Since the Slot.It pod is more than a rear-axle-to-motor bracket, I'm guessing it is not allowed.

[Phil Kalbfell]

Yes Robert that was the intention when I drafted the rules some time ago. We wanted to try and get some old fashion scratch building going on!

[redlynr]

So no screw in race type pods from any manufacturer? Just to be clear...

[Sports Racer]

Correct.

The only parts you can use that can be commercially made are the guide tongue, axle pillow-blocks and rear axle brackets (not motor brackets such as HRS). You can't even use a modified Womp or 1960's Monogram chassis.

This is how we used to make chassis 40 years ago.

Hope this helps clear things up.

Cheers

Paul

[mmmoose1]

Sportsracer show them a photo of the kind of chassis that you are looking for. I love my Jig now. . .

Ken

[redlynr]

What about an integrated guide tongue/pillow block mount like this?

[Sports Racer]

Originally Posted by redlynr

What about an integrated guide tongue/pillow block mount like this?

not allowed

[mmmoose1]

I was just looking around at some bodies and is there any max width rule as long as the body covers the tires? I found a BMW body that is 70 mm wide.

Looking forward to giving this a shot. Ken

[Phil Kalbfell]

.


Here are afew examples of cars we have built for the old WPR Proxy event over the years also check out Chris Briggs's site for a good build article.