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The difference between the RVI system and those used in

7th August 1982, Page 11
7th August 1982
Page 11
Page 11, 7th August 1982 — The difference between the RVI system and those used in
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the last war is that the former will operate on green wood which could not be used for any other purpose and so there will be no environmental objections on the grounds of forest stripping.

Renault suggests that other vegetable products, for example maize cobs and straw, could also be used.

Recent experiments have shown that, with modern generators, the gas produced from 3 to 3.5kg (about 71b) is equivalent in energy content to one litre (about 13/4 pints) of derv.

In contrast to the last war when gas was used for spark ignition engines, the RVI development has been concentrated on turbo-charged diesels.

The engine is started on diesel and run on straight dery until the gas generator is capable of producing combustible gases — usually about five minutes.

The forced draught necessary for the gas generator to function is provided either by the engine's own air intake system or by the turbocharger.

Wood gas does not ignite spontaneously and so cannot be used on its own but RVI development has shown that a mixture of 75/25 per cent gas/ dery is satisfactory.

For future development RVI is working on high efficiency purification of the wood gases and optimisation of the engine settings for use with both fuels.

The extra equipment required, including a supply of wood for 500km (300 miles) weighs about 11/2 tonnes.

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