PLYWOOD DERBY
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For years Cub Scouts have loved to participate in the Pinewood Derby held each year in Packs around the country.
The bonding that takes place between parents and children while carving, building
and racing these 7" model cars lasts a lifetime. Unfortunately this activity does
not carry on for the boy when he enters a Boy Scout Troop.
Boy Scouts use to sponsor a Soapbox Derby, but nowadays this has become a very complicated
and expensive event. A Soapbox Derby car costs over $500 to build and has very
precise racing rules. Tres Ranchos has developed a less expensive version while
trying to maintain the spirit of the event. We call it a Plywood Derby.
Tres Ranchos District has put together kits so that a boy can purchas and build
a 4' - 6' race car, actually get into it and compete against other scouts in a downwill
race. These cars, more advanced than a Pinewood Derby car, will develop the
boy's mechanical abilities and skills. This is a Big Boy Toy. Using a sheet
of plywood and some advanced tools, the boys cut out a pattern and construct the
cars at a cost of about $100. The Plywood Derby requires seat belts and personal
protective equipment for all cars and drivers.
The downhill racecourse is 1,000' long and the cars will reach speeds of up to 30 mph.
We invite all to support the project and the boys of our community.

CONGRATULATIONS Joey, Jonathan, Jesse, Mitchell, Roland, Rick, George, Dan, Kenneth,
Ryan, Mark, Jarrett, Travis, T.J., Vincent, Nat, Darius, Richard, Kristofor, Charles,
Michael, Tim, Daniel, James, Brian, Joshua, Bryan, Christopher and Keith for being
TR's very first Plywood Derby drivers.
WINNERS
Tres Ranchos Plywood Derby Rules
Participants
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Any registered Boy Scout who is a member of a troop within the Tres Ranchos
District of the San Francisco Bay Area Council of the Boy Scouts of America
may enter this competition. (Some Scouts may be too large to fit in a standard
Derby Car safely).
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Some Troops from outside the District may participate, by special invitation
only.
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Patrols are encouraged to enter as many cars as they have the time
and money to build, up to one per person.
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Patrol built and entered cars may be raced by up to four individuals. Each
individual must pre-register for the race.
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Troops may form provisional patrols for the purposes of this event.
Construction
Fairness
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A fair competition is a goal of this event. The knowledge that all drivers
are entering a well designed car using common parts will inspire confidence
and promote a better self image of all participants.
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All cars must be constructed using All of the parts in the kits
supplied by the District. No substitutions will be allowed. These parts
include wheels, axle bolts, steering mechanism and brake parts.
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No bearings of any sort may be added to the wheels or axles. Washers are
permitted although not necessarily helpful.
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No modifications may be made to the wheels supplied in the kits.
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Lubricants are permitted, but may not be added after final check-in.
Size Limits
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Custom designs are permitted, but design plans must be approved by the
race committee's engineer and safety officer prior to construction.
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Overall dimensions may not exceed 24" wide by 72" long by 24" high.
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Weight may not exceed 100 lb. including any ballast.
Materials
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Nails, screws, dowels, or other exotic wood joints such as mortise
and tenon may all be used to join parts together. Be aware that nails and
screws do not hold well in the edge of plywood and may cause delamination.
All joints should be glued using a wood glue.
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Exterior grade plywood of 3/4" thickness with a minimum of 5 plys should
be used.
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No metal, plastic or fiberglass frame or skin parts may be used. This does
not exclude metal fasteners, hinges, brackets or other hardware.
Safety Items
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Each car
must have Loctite applied to the front wheel bolt threads. This
is to prevent bolt loosening during the races.
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Each car must be equipped with brakes allowing it to stop in a controlled
fashion, without the possibility of loss of steering while stopping. No
front wheel brakes or brakes which might cause the front wheels to leave
the ground will be permitted. The District will provide an acceptable design
and critical materials for brakes.
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Each car must be equipped with the automotive grade safety belt provided
by the district.
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The Pitman arm (eye-bolt) must be turned in all but one turn to shorten
it as much as possible without jamming. This will reduce over steer in
this downhill event.
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External corners must be rounded to prevent injury.
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Foam rubber bumpers equivalent to 1/2 inch pipe insulation must be installed
on front and rear.
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No sharp or protruding elements are permitted.
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Any ballast weights must be secured to prevent movement and must not pose
any risk to the driver.
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The driver must be able to see clearly the space in front of the car.
Decoration
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Each car
should be painted.
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The space on both of the outside surfaces of the seat
should be reserved
for sponsors' decals.
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Troop, Patrol or individual identification should be on the top surface
of the cowling.
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A pre-printed car number will be issued at the time of registration to
affix to the front and rear of the car.
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For muti-driver cars, individual names may be placed on the back of the
car.
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No Brand names (other than sponsors') or copyrighted designs should
be used.
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No profanity or offensive language or images should be used to decorate
the car.
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Judge's decisions are final.
Race Day Rules
Safety Gear
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Each Driver must wear a properly fitted helmet, knee pads, elbow pads,
gloves and safety glasses during the race.
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Hockey, motorcycle or football helmets are recommended.
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Shoes must be worn by drivers - no sandals or bare feet.
Uniforms
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All Drivers must wear a regulation class "A" Boy Scout uniform.
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Hats may not be worn during the race due to wearing helmets.
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Neckerchief and slide must be removed prior to the race
Classes
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The competition will be divided up into weight classes.
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Awards will be made in each class.
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The weight of the car
and the driver together will determine the class.
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Ballast may be changed to accommodate different drivers of the same car.
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Weight class for each driver will be determined at check-in.
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Weight will be re-checked immediately prior to each race.
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Classes will be
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ultra light - less than 125 lb.
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lightweight -between 125 and 150 lb.
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middleweight between 150 and 175 lb.
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heavyweight between 175 and 200 lb.
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ultra heavy over 200 lb. (requires a custom car)
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A minimum of six drivers will be required in each class. Any class with
fewer than six will be combined with a neighboring class
Conduct
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Conduct becoming a Boy Scout, in the spirit of the Scout Oath and Law,
will
be maintained by all competitors.
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Any discussions between a driver and any official must be conducted in
a courteous and calm manner.
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Any racing disputes will be between the driver and race officials only
-- NO advocates.
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Adults are specifically prohibited from arguing with race officials.
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Failure to abide by these conduct rules will result in the immediate disqualification
of the driver.
Check-in Procedures
Race officials will make a number of safety and procedural checks when
you check-in on race day.
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Registration verification.
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Safety Belt is properly installed and will not cause the seat to come apart.
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Brakes will be checked for holding power on a 30 degree slope with the
rider belted in.
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Helmet will be checked for proper fit.
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Shoes will be checked.
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Uniform will be checked.
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Fairness Rules Inspection
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The car
will be turned up on its end to inspect the bottom.
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All kit parts must be present and properly assembled.
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Steering must work properly.
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Pitman arm must be adjusted to short position. This will have to go to
repairs to be done.
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No modifications to the wheels or other kit parts must have been made.
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No Bearings have been added.
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Initial weigh in for class assignment.
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Wheel alignment check. Only wheels grossly out of alignment will be corrected.
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Torque check - adjustment of front wheel bolts.
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Loctite check /reapply.
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Numbered bibs will be issued to drivers.
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Car
numbers will be checked. (numbers will be issued with kit)
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Turn in the car to the "Pit crew" for safe keeping. No further modifications
will be permitted, Only Repairs.
Racing
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Each driver and car will be re-weighed immediately preceding each race.
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Drivers will be wearing helmets, knee pads, elbow pads, gloves and safety
glasses during the weighing.
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Each registered driver will race in two or more heats
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Each heat time will be recorded.
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Initial heats may be determined by test run times or by random number assignment.
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Heat times will be used to establish pairings in each subsequent heat.
Times will be sorted into descending order then pairs which are repeat
matches will be separated, and pairs which are using the same car will
be shuffled to be at least three races apart, leaving the pairings
for the next heat.
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Slowest heat times will run first in next round heats.
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Each Class will complete the round of heats before moving on to the next
class.
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Driver match ups will not be repeated in subsequent heats except for finals.
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Best two times for each driver will be added to determine finalists.
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The four fastest times will be finalists.
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Finals will match each finalist against all others in three rounds.
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Times from earlier heats will not be used in the final scoring.
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Times from all three rounds of the finals will be totaled for each finalist
to determine placements.
Repair
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Should your car experience an accident, it may be moved to the repair pit.
This area will be staffed with qualified personnel and tools and a
limited supply of parts. They will help you to repair your car as well
as conditions permit.
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The repair pit staff will determine whether or not a car is fit to race
again.
CAR PLANS
Directions
Plywood Layout (PDF file)
Brake Plans (PDF file requires Legal size paper (8.5 x 14) to print)
Accessory Part List
Seat Belt Installation Instructions
Side View (PDF file - legal size)
Ramp Plans (PDF - legal size)
Registration Form
Planning Time Line
Map
Driving Map
Driving Instructions:
Go east on I-580 past the construction and past the new BART station.
Take the Hacienda Exit and go North on Hacienda.
Turn right on Gleason, and then
left on Barnet.
Pass through one chain-link gate (open), and then
turn right at the fence onto Broder Blvd (as it appears on the map)
and through a second chain link gate (open) on Creekview Dr.
Continue along this road with the fence on your left side until you see the derby area.
From the North, go South on I-680, and then East on I-580.
From the South, go North on I-680, and then East on I-580.
 Good bye Scott -- This was our District Executives Last Event with our district
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