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Now it’s time for Dick and Jem to proudly reveal their new thoroughbred delivery vehicle to the expectant new owners.

The next morning, and the whole bike has to be stripped down to get to the heart of the problem.

Jem’s working on the mounts for the air tanks. They’re coated with carbon fibre, a material that can’t be welded. He...

So they’re building a moped powered by fresh air. They’ll replace the petrol engine with an air motor and the gas tanks...

This time the Planet Mechanics are tackling a tricky challenge down on the farm. Can they tame this fuel-guzzling monster, by...

Fortunately they still have the oil they made earlier. So it’s time for the ultimate test: will that oil fire up the grain...

To drive the press, they’re salvaging this scrap lawnmower and will convert its petrol engine to run on biogas.

Is there anything else on the farm they can use to fuel the grain dryer?

Although the tank seems leak proof, Dick and Jem are taking no chances with their potentially explosive gas plant. They’ve...

Grain can’t be stored if it’s too wet. Trouble is the average British summer means crops sometimes have to be harvested...

The Planet Mechanics are trying to save one of the world’s most beautiful cities – Venice.

They’re worried that the engine might not be strong enough but to get the boat onto the plane, Alberto will need to give it...

Alberto wants to base their water taxi on one of the boats that was made in his boatyard. He’s lending them a traditional...

Dick and Jem travel to Italy to take on one of the world’s most polluting forms of transport -motor boats.

The Planet Mechanics are battling to conjure up electricity out of thin air. They must make England’s most remote youth...