World RC Speed Challenge
ROSSA

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Featured Car // Swiss SMP Slide :: Matt Mia
Currently converted to 6S Lipos / Castle Creations Monster Mamba Conversion / 83mph 2011 SCR UK
ROSSA Class Definitions

Overview

ROSSA’s aim is to establish a method and a set of classes to ensure there is an agreed international standard for the running of RC vehicle top speed events.
Primary to this aim is the definition of a of set of classes that RC vehicles can be segregated due to either a fundamental difference in design or a recognised and proven difference in achievable class speed
Secondly ROSSA aims to provide technical specification guidelines for the equipment to be used to accurately measure the velocity of an RC vehicle.

Thirdly ROSSA will list the official overall and class fastest speeds achieved in each class and ensure ratification of the records to the ROSSA standards so that the speed measures is a true accurate measurement of the vehicle

Classes are listed on the official ROSSA website at www.rossa.org.uk and are reviewed and updated annually.

ROSSA official classes for 2016

  • Electric 1 Cell
  • Electric 2 cell
  • Electric 4 cell
  • Electric 6 cell
  • Electric Open
  • Electric Bike
  • Electric Open Wheel
  • Electric Large Scale
  • 808 (8th Scale On road 8 Cells)
  • IC Small Block
  • IC Big Block
  • IC Open
  • IC Bike
  • IC Open Wheel
  • IC Large Scale
  • Non Wheel driven
  • Mini Class

 

General Construction Rules

  • All vehicles must be remotely controlled. No guidelines, guide rails or retaining wires are allowed
  • All vehicles must have a body shell and this must be securely fastened and remain in place throughout the run
  • All vehicles of all classes must be fitted with a failsafe device that will stop the vehicle by application of the brakes and/or deployment of a drag chute if fitted. It must also cut the power to the transmission in the event of a signal loss.
  • All vehicles must have installed suitable radio equipment with adequate range to ensure the vehicle will stay under the control of the operator during its entire run.
  • Steering gyros allowed in any class
  • No fuel restriction in IC classes
  • No exhaust restrictions in IC classes
  • Bikes to have 2 wheels, other vehicles 3 or more wheels
  • All parts of the vehicle are to be securely fastened to the car such as batteries, radio equipment etc. so that it will not come loose during the speed run
  • Electric vehicles that run capacitance storage devices must ensure that the max voltage deliverable to the motor does not exceed the voltage for the stated class

Note: The Open Wheel classes are for buggy type cars rather than F1 style chassis. Technical inspection will decide if the entry qualified for the open wheel class or should be entered into any of the above classes. This is to promote fair competition

Electric 1 Cell

Vehicles are classified as Electric 1 cell as long as they meet the general construction rules and the following criteria
· Single Electric Motor any size
· Max size of electric motor 540 can size
· Single cell LiPo or equivalent
· Max Mah of Cells = Unlimited
· Maximum length of 1000mm
· Maximum width 300mm
· Commercial or custom body chassis and shells

Electric 2 Cell

Vehicles are classified as Electric 2 cell as long as they meet the general construction rules and the following criteria
· Single electric motor any size
· 2 Cell LiPo or equivalent
· Max Mah of Cells = Unlimited
· Max length 1000mm
· Max width 300mm
· Custom or commercial chassis
· Commercial or custom body shell

Electric 4 Cell

Vehicles are classified as Electric 4 cell as long as they meet the general construction rules and the following criteria
· Single electric motor of any size
· 3 to 4 Cell LiPo or Equivalent
· Max Mah of cells = Unlimited
· Max length 1000mm
· Max width 300mm
· Custom or commercial chassis
· Commercially or custom body shells

Electric 6 Cell

Vehicles are classified as Electric 6 cell as long as they meet the general construction rules and the following criteria
· Single electric motor of any size
· 5 to 6 Cell LiPo or Equivalent
· Max Mah of Cells = Unlimited
· Max length 1500mm
· Max width 300mm
· Custom or commercial chassis
· Commercially or custom body shells

Electric open

Vehicles are classified as Electric Open as long as the meet the general construction rules and the following criteria
· Any size electric motor or multiple motors
· 7 cell LiPo or over
· Maximum length of 1500mm
· Maximum width 400mm
· Custom or commercial chassis
· Commercially or custom body shells

Electric Open Wheel

Vehicles are classified Open Wheel if they meet the following criteria
· Any Buggy, Truck or Truggy based kit
· Single electric motor any size
· Up to a MAX of 6 Cell LiPo or Equivalent
· Max Mah of Cells = Unlimited
· Bodyshell must not cover the wheels
· Wheel diameter to be min 90mm
· Stock kit chassis with commercial or custom upgrades

Electric Bike

Vehicles are classified Electric Bike if they meet the following criteria
· Any 2 wheeled vehicle with rear wheel drive
· Single electric motor any size
· Any cells
· Max length 1500mm

Electric Large Scale

Vehicles are classified Large Scale if they meet the following criteria
· Any 1/5th scale based kit such as FG or HARM
· Single electric motor of any size
· Any cells
· Max Length of 1500mm

IC Small Block

Vehicles are classified as IC Small Block as long as the meet the following criteria
· Single engines up to 0.18 Cu in (small block mounting)
· Max length 1000mm
· Stock kit chassis with commercial available upgrades
· Commercially or custom body shells

IC Big Block

Vehicles are classified as IC Big Block as long as the meet the following criteria
· Single IC engines up to 0.32 Cu in Big Block Mounting
· Maximum length of 1000mm
· Maximum width 300mm
· Commercial or custom chassis
· Commercially or custom body shells

IC Open

Vehicles are classified as IC open as long as they meet the following criteria
· Maximum length of 1500mm
· Maximum width 300mm
· Any size engine or engines, which use the expansion of gasses as its prime mover such as IC, Turbine with gearbox, Wankel, Steam etc…

IC Open Wheel

Vehicles are classified open wheel if they meet the following criteria
· Any Buggy, Truck or Truggy based kit
· Single IC engine up to 0.45 Cu in or 7.5cc
· Body shell must not cover the wheels
· Wheel diameter to be min 90mm
· Stock kit chassis with commercial available upgrades

IC Bike

Vehicles are classified IC Bike if they meet the following criteria
· Any 2 wheeled vehicle with rear wheel drive
· Any fuel
· Single engine with max size of 0.32 Cu in
· Max Length of 1500mm

IC Large Scale

Vehicles are classified Large Scale if they meet the following criteria
· Any 1/5th scale based kit such as FG or HARM
· Single IC engine with max displacement of 70cc
· Max Length of 1500mm

Mini Class

Vehicles are classified Mini if they meet the following criteria
A commercial kit listed as being 1/12thscale or smaller OR
· Max Wheel Base          =          225mm
· Max Width                     =          175mm
· Electric or IC power

Non Wheel Driven Class

A car is classed as non wheel driven if the propulsion system is anything other than a motive force that turns the wheels. Non wheel driven cars are further split into sub classes depending on their propulsion method. These sub groups are:

  • Jet
  • Rocket (Liquid, Solid, Hybrid, Steam, Pressurised gas)
  • Pulse Engine
  • Ducted fan
  • Prop

8O8 Class - 8th scale On road 8 cell

Vehicles are classified as Electric 8O8 Class as long as they meet the general construction rules and the following criteria:

  • Chassis should be 1/8th scale and commercially available GT type or converted buggy
  • Chassis that are markets as 1/10 such as the TRAXXAS SLASH but have chassis wheel base measurements the same as 1/8 kits are allowed
  • Chassis can be original or custom made. If custom made the original kit wheel base and width must be retained.
  • The original kit parts should be retained as much as possible.
  • Mods to the chassis are allowed but must not replace existing factory chassisCustom modifications to the drive train are allowed. 
  • Single electric motor any size
  • Maximum of 8 cells
  • Max Mah of cells = Unlimited
  • Custom or commercially available body shell which must cover the wheels.

 

General Construction rules for Non wheel driven cars

The general construction rules stated previously apply to Non Wheel Driven cars with the addition of the following

  • The failsafe device must cut the fuel to the propulsion system in the event of a signal loss with the exception of solid fuel rockets

Safety considerations

ROSSA does not take any responsibility for safety at events as this is the sole responsibility of the event organisers. Non wheel driven classes are defined for the purpose of ensuring equal completion between events. If an event decides to run Non wheel drive cars a number of safety considerations are listed below that you may want to consider

Solid fuel rockets must be given special considerations due to the fact that the propulsion system cannot be shut down after ignition. ROSSA suggest the following precautions for these vehicles

  • Any solid fuel rocket prepared vehicle must have to prove that they have completed a successful run prior to the event. The event is for competition and not for testing prototype vehicles.
  • The designer/operator must show that the burn time or the solid fuel rockets is calculated to burn up to and not passed the speed measuring equipment. They must also show that they have calculated an appropriate start point considering the burn time of the rockets
  • Solid fuel rockets are to be placed singularly or one above the other. No side by side engines allowed as a miss fire will push the car offline and possibly spin
  • It is suggested that a separate area for rocket cars be made available for preparation that is away from crowds and the main pits.

Speed Measurement

For a record to be ratified by ROSSA the speed measurement must meet the following minimum standards

A minimum of 2 devices are required consisting of a primary device and a backup device. The primary device must be a system that will time the vehicle over a measured distance by the tripping of 2 gates. The device must have a certificate of accuracy and be proven to be accurate within 0.1mph. The distance between the gates shall be no less than 20ft or 9.44 metres

ROSSA suggests the following equipment for the primary device

TRACKMATE Speed Trap with sensors that will span a minimum of 50ft width.

The backup or secondary device must comply with the following specs as a minimum.

A second device the same or with similar specifications to the primary device

The accepted speed is the speed measured on the PRIMARY device. The speed is accepted ONLY if the backup device is within 5% of the primary device.

Backup device outside 5% of primary device

The speed on the primary device is recorded and the contestant is asked to make another run with his car. The backup run must be within the 5% of the first run. The fastest of the 2 runs is the accepted speed.

Timing device failure

If the primary or secondary timing device fails the event can continue with a single device. Contestants must make a minimum of 2 runs with a correlation between the 2 run of 5% or less. The faster of the 2 runs is the accepted speed

Speed Runs

For a run to be officially recognised as a ROSSA record it must comply to the following requirements

  • The vehicle must have traversed the speed trap under control and on its wheels with the body intact
  • The car must complete the run in 100% working order with no loss of parts or shell
  • For a class record to be recognised the new record must exceed the old record by at least a full MPH.

A J Lovering
ROSSA Chairman

Test your machines speed to the limit... Next Speed Event August 2014
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