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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 defining of set of classes so that RC vehicles can be segregated due to either a fundamental difference in design, and after, a recognised and proven difference in achievable class speed.
Secondly ROSSA aims to provide technical specification guidelines for the equipment required to accurately measure the velocity of an RC vehicle.
Thirdly ROSSA will list the official overall and class fastest speeds achieved and ensure ratification of the records to the ROSSA standards so that the speed is a true accurate measurement and that the car complies with the appropriate class definition
Classes are listed on the official ROSSA website at www.fast-rc.co.uk and are reviewed and updated annually. The methods for reviewing and updating the classes are listed on the ROSSA website.
ROSSA official classes
- Electric Open
- Electric Modified
- Electric Stock
- Electric Bike
- Electric Open Wheel
- IC Open
- IC Big Block
- IC Small Block
- IC Bike
- IC Open Wheel
- Large Scale
- Non Wheel driven
General Construction Rules
- All vehicles must be remotely controlled. No guidelines, guide rails or retaining wires are allowed
- Body shells must be securely fastened
- All vehicles of all classes must be fitted with a failsafe device that will stop the vehicle by application of the brakes and 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 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
- Bodyshells can be customised in any class with addition of side dams and wings
Note: The Open Wheel classes are for buggy type cars and not 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 open
Vehicles are classified as Electric Open as long as the meet the following criteria
· Any size electric motor or multiple motors
· Any cells
· Maximum length of 1500mm
· Maximum width 400mm
Electric Modified
Vehicles are classified as Electric Modified as long as the meet the following criteria
· Single electric motor any size
· Max cell capacity 15V 5000 mah
· Max length 1500mm
· Max width 400mm
· Commercial or custom chassis
Electric Stock
Vehicles are classified as Electric Stock as long as the meet the following criteria
· Single electric motor of 540 can size
· Max cell capacity 7.4v 5000 mah
· Stock kit chassis with commercial available upgrades
· Commercially available or custom body shells with any aero mods
Electric Open Wheel
Vehicles are classified Open Wheel if they meet the following criteria
· Any Buggy, Truck, Monster truck or Truggy based kit
· Single electric motor any size
· Max cell capacity 23V 5000 mah
· Bodyshell must not cover the wheel
· Stock kit chassis with commercial available upgrades
Electric Bike
Vehicles are classified Electric Bike if they meet the following criteria
· 540 size electric motor
· Any cells
· Max length 1500mm
IC Open
Vehicles are classified as IC open as long as the meet the following criteria
· Maximum length of 1500mm
· Maximum width 400mm
· 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 Big Block
Vehicles are classified as IC scale as long as the meet the following criteria
· Single IC engines up to 0.32 Cu in
· Maximum length of 1500mm
· Maximum width 400mm
· Commercial or custom chassis
IC Small Block
Vehicles are classified as IC scale as long as the meet the following criteria
· Single engines up to 0.18 Cu in (small block mounting)
· Stock kit chassis with commercial available upgrades
· Commercially available or custom body shells with any aero mods
IC Open Wheel
Vehicles are classified open wheel if they meet the following criteria
· Any Buggy, Truck, Monster Truck or Truggy based kit
· Single IC engine any size
· Body shell must not cover the wheels
· 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
· Max engine size 0.32
· Any fuel
Max length 1500mm
Large Scale
Vehicles are classified Large Scale if they meet the following criteria
· Any 1/5th scale based kit such as FG or HARM
· Max engine size 35cc
· Max length 1000mm
Non Wheel Driven Class
A car is classes 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
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. 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 10ft or 3.048 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 similar to the primary device
OR
A radar gun with a calibration certificate. The gun must be located on a tripod and have a continuous read out. The horizontal and vertical angles from the gun to the measuring point must be measured and the COSINE error for the device calculated and factored into the measured speed.
The gun should be located behind the final primary device trap and aimed at the point the vehicle will cross the final speed trap gate
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
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