Grimme - CS/CW150 Rotapower

Driving impression: Grimme CS/CW150 Rotapower stone/clod separator …the bank balance without an effective destoner working ahead of the potato planter – to remove those in-field undesirables. Martin Rickatson tries out Grimme's revised Combistar models, which can supply growers both web- and star-based options for removing clods and stone from their sensitive spud beds

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Driving impression: Grimme CS/CW150 Rotapower stone/clod separator …the bank balance without an effective destoner working ahead of the potato planter – to remove those in-field undesirables. Martin Rickatson tries out Grimme’s revised Combistar models, which can supply growers both web- and star-based options for removing clods and stone from their sensitive spud beds

Boosting machine output while at the same time lowering hp requirement is every machinery engineer’s holy grail. Achieving the feat, while at the same time slimming down implement dimensions, would make many observers suspicious of any manufacturer coming up with such an assertion. Grimme, however, reckons it has achieved each one of these main aims with its new Rotapower stone/clod separators, which are available in both web and star formats, and are capable of handling up to 80in beds.

So how does downsizing a destoner – Grimme has shrunk the internal width of the machines to 1.5m from front to rear, as well as cut overall length – equate to an increased appetite for work?

Key to the claims is what the firm tags Rotapower. Following the revised short, one-piece serrated digging share – this share is used in preference to the former multi-bladed unit – is a patented spiraleffect rotor, which is 200mm in diameter and replaces the steel roller previously installed here. Powered by the machine’s pto drive, this rotor propels soil up on to the machine and reduces the total load on both destoners’ leading star rows – the web-based machine incorporates an initial two star rows before the first web – before the material moves on to either the remaining five star rows on the CS150 (star-based machine) or the first web on the CW150.

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