| Requirement |
Cats
Whiskers
|
Other
"Absorber" Systems
|
| Seal
gap around tyre under all conditions of loading |
|
|
| Must
control/absorb fine spray under all weather conditions |
|
|
| Must
not damage tyres if held in continuous contact |
|
|
| Must
be low in weight |
5 KG/Wheel
excluding mudguard
|
TBA Heavy
|
| Must
not interfere with wheel removal |
|
Top section
needs to be removed before removing tyre
|
| System
must be flexible for safety reasons and porous |
|
Impervious |
| Must
not clog with fibrous material from road |
Self cleaning
|
Clogs rapidly
and effectiveness impaired
|
| Must
not require other modifications to vehicle |
|
Cab roof
deflector gives improved results in still air conditions
|
| Must
not be damaged by clogging in freezing or icy conditions |
No problems
down to -30 C
|
Clog and
can tear off under their own weight
|
| Must
approach road surface as closely as possible under all load
conditions |
Only system
to attempt control of footprint plume
|
Rigid and
cannot approach closer than 6" to the road. Do not effectively
control footprint plume
|
| Must
be cheaply and easily replaceable to minimize after cost |
|
Total replacement
required
|
| Must
be simple to fit |
|
Requires
individual trimming to fit specific vehicles
|
| Must
be able to treat steered wheels effectively |
|
|
| Must
be corrosion resistant to all chemicals used normally on the
road |
|
|
| Must
perform at all speeds |
|
Some systems
are not effective at lower speeds (bounce back)
|
| Must
perform under heavy surface water conditions |
|
Saturation
of absorbers can result in bubbling outside surface which
is stripped by the air steam and creates spray
|
