Sweeper designs face the ‘Scrapheap Challenge’
Sweeping along the road to TV fame, far from the serious day-to-day business of engineering state-of-the art equipment to meet the demanding environmental standards, a leading British manufacturer faced an entirely different test when Johnston Compact Sweepers' Chief Engineer, Mike Hasler, lent his expertise to one of the teams competing in the popular Channel 4 show, "Scrapheap Challenge". In an episode broadcast recently the challenge was to build a road sweeper and Mike Hasler was drafted in as one of the "experts" to assist the Chaos Crew. In this report for LAWE, he recalls the event, and gives some behind-the-scenes insights into the way the programmes are made
Anyone who has an interest in tinkering about and making things – ie engineers
– would have to admit to more than a spot of envy towards the teams taking part
in Scrapheap Challenge. The whole concept of botching something up out of bits
of rubbish and getting the hands dirty is irresistible. So, imagine my delight
and surprise when I found myself invited to be the “expert” for a
team building a road sweeper in Los Angeles – all expenses paid. Yes, I could
Frequent communications with the organisers led to certain items being available
for the build – let’s face it, you wouldn’t really expect to find an ex-PowerGen
Land Rover in a junkyard in California, would you?
Both teams duly gathered in Los Angeles. My team – The Chaos Crew – were old
hands, having for a previous challenge built a hydraulically operated demolition
device, which took the form of giant pincers mounted on an old Transit. This
would have won easily had not a hose burst.
Our competitors were from Jaguar in Coventry who took the whole thing very
seriously indeed – as anyone who saw the programme might have noticed. The judge
was Roger Hoadley, MD of Scarab.
Scrapheap Challenge rules require that the teams have no knowledge of what they
are to build prior to the event, so, on the morning of the build day, before
dawn, we were off to the scrapyard to do the preliminaries – sound, lighting,
make up (well lashings of suntan lotion actually) and our designer boilersuits.
Then the challenge was announced and the ten hours allowed for making the machine
We duly “found” the Land Rover, but unfortunately the auxiliary engine
I’d asked for turned out to have been difficult to adapt, so we had to think
again , and quickly. The alternative design involved making the Land Rover front
wheel drive and welding a third axle upside down to the chassis. This, in turn,
was connected to the rear prop shaft with one wheel flange used to drive the
elevator and the handbrake on the opposite side used as a clutch. The elevator
was of the squeegee type and based on a lightweight conveyor used for loading
missiles into aeroplanes.
Inevitably, we ran out of time so development would have to take place during
the challenge, but, at least, we had everything running OK.
The Jaguar guys had built a “pooper-scooper” with a small auxiliary
engine directly driving a home-made impeller. Material was drawn through a wanderhose
and passed through the fan into a truncated Transit panel van.
Result in the balance
The competition took place in the car park of a tourist attraction in Irvine
– 40 miles or so from the scrapyard. Vast amounts of litter, mostly newspaper,
were scattered about and we had 30 minutes to collect as much as possible.
Both machines worked pretty well, but our complete lack of development ment
that bulldozing was a big problem. Nevertheless, we were able to pick up a good
quantity of litter.
The opposition, on the other hand, were able to cruise round the car park picking
up coke cans and heavy gravel with their “pooper scooper”. That is
until their fan was smashed by the gravel hitting it, which is fairly inevitable
with this sort of design.
Even so, as the challenge was to be decided on weight, we started to get a bit
worried when the collected material from each machine was hung from each end
of a giant balance. Victory had been snatched from our grasp. We were all exhausted
and filthy dirty, but the runner up’s champagne went down a treat and helped
soften the blow. After all, it’s not the winning – it’s taking part (bah, humbug
!) and we’d all had a fantastic experience.