FEG Conference PenrithColin JT Mackenzie BSc BSc(Eng) CEng MICE

FIHTProject Consultant to the Highland Timber Transport Group

Structure of PresentationIntroductionThe rise of the Super SingleRoad Friendly VehiclesThe Crystal Ball

23/10/2007 Colin JT Mackenzie 2

Introduction: What is the Problem?

23/10/2007 Colin JT Mackenzie 3

The rise of the Super SingleTwin wheels Super SinglesCOST 334: Super Singles superior

inSafetyRunning costsEnvironment

BUTHighly damaging to fragile local

roads - x7!23/10/2007 Colin JT Mackenzie 4

Road Friendly VehiclesKey issue: How do we make

timber trucks less damaging to roads?

Make tyre footprint as big as possibleIncrease tyre widthLower the tyre pressureUse multiple wheels

23/10/2007 Colin JT Mackenzie 5

Tyre Footprint

The John Scott LGP system5 years development by

JSTTwo basic systems:Case 4x4 tractor plus

trailer(s)Volvo 6x6 plus trailerDifferent systems,

different uses

23/10/2007 Colin JT Mackenzie 6

Rear SuspensionsBalance beamCase: McCauley

And multi wheelVolvo: King

23/10/2007 Colin JT Mackenzie 7

23/10/2007 Colin JT Mackenzie 8

Volvo•80t Gross 45t load

•Off public road

•Red Diesel Economy

•Best for deep forest

high volume haulage

to transhipment point

•Best with exclusive

use of road

23/10/2007 Colin JT Mackenzie 9

23/10/2007 Colin JT Mackenzie 10

Case•32t Gross 15t+ Load

•Can cope with poor roads

•On and off public road

•Good for short hauls

outside forest but no crane

•Well suited to ‘all in’

roading and haulage

contract

23/10/2007 Colin JT Mackenzie 11

Central Tyre Inflation (CTI)Onboard computer

controls tyre pressure

Lower speed, lower pressure, greater traction

Excellent feedback. ROADEX report in November

4+ units now in use in Scotland

23/10/2007 Colin JT Mackenzie 12

Super Super Singles•Wider, lower profile tyre•Bigger footprint•As good as twin wheels?

23/10/2007 Colin JT Mackenzie 13

23/10/2007 Colin JT Mackenzie 14

23/10/2007 Colin JT Mackenzie 15

Situation

Conventional (super single artic)

Specialist (twin wheel or SSS &CTI equipped)

Tractor +LGP trailer (15t payload)

Specialist LGP (45t payload)

Served by agreed route (and short distance in forest)

Served by weak consultation route (and short distance in forest)

Hauling to nearby transfer stockpile

Short/medium in-forest haul to stockpile (0-20km round trip)

Long in-forest haul to stockpile (10km+ round trip)

The Crystal BallRoad friendly vehiclesSharing of dataA more holistic approach to

transport procurement

23/10/2007 Colin JT Mackenzie 16

23/10/2007 Colin JT Mackenzie 17