Lely Hydraspin CDA Sprayer

Location
Ross



In the 1970s Lely produced a new type of sprayer called the Hydraspin. Controlled Droplet Spraying (CDA) involved an atomising cone which was spun at high speed while the chemical was fed in, and this produced a mist of equal sized droplets. The technique was short-lived in the UK, but continues to be used in Africa where water is sometimes difficult to source, and funds for chemicals are hard to come by.

Lely Hydraspin sprayers were popular in the Scottish-English borders at the time but the machine was withdrawn after a few years. The advantages for the farmer was a significant reduction in chemical needed as the droplet size was very consistent, but this obviously hit chemical sales. The disadvantages were an increased danger of spray drift as the machine had little of no downward pressure from spray bar to the crop. It created a cloud of micro-drops which took time to settle and would of-course be easily blown away.

CDA1.jpg


CDA2.jpg

Lely handbook for their Hydraspin CDA sprayer range

The technique is largely forgotten, though still very much in use in Africa in a hand-held machine made by Micron.

Having the handbook and a spare atomiser, the technique is still of interest to people wanting to make a better sprayer, and I would be interested in hearing from others with a similar interest.

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Gadget

Member
BASE UK Member
Location
Sutton Coldfield
We had a Hortine Farmery one, the only problem was that each disc had its own pressure relief valve to control flow (worked by compressed air over the spray liquid). Unfortunately we had issues getting them to meter the correct amount.
When it was working, we were so behind with the spraying that we had to get on and went at times that it was windier than we would have liked, I was impressed by how the droplets span out backwards but then dropped into the crop.
I still have the instruction book somewhere, it is typed A4 with gaps left and real photographs stuck in. If I can find it I will scan a couple of pages and post them up.
 

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Fake it ‘til you make it

SRUC tops UK list for SME consulting income

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Written by John Swire

Scotland’s Rural College (SRUC) provides more business value to SMEs than any other higher education institution in the UK.

This is according to a new study by Universities UK that found – over a four-year period – that SRUC generated more than £57.5 million of income through its consultancy and Veterinary Services.

SRUC was ranked above the University of Liverpool (£54m) and the Royal Veterinary College (£31.5m), with the University of Edinburgh (£16.5m) and the University of St Andrews (£12.5m) the only two other Scottish entries in the top ten.

In terms of the UK, Scotland finished above the North West (£83.5m) and London (£76.1m), with SRUC responsible for...
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