n. 12/2023 57 GARDENING ratore) è flessibile e dotato di un’impugnatura per il suo orientamento verso il materiale da intercettare. Sui modelli più evoluti, tale maniglia può essere anche multifunzione, raggruppando in sé un certo numero di comandi, in modo da governare l’attrezzo con una sola mano. Inoltre, la maniglia può incorporare anche un piccolo monitor delle prestazioni dell’attrezzo. La posizione e la conformazione dell’impugnatura del tubo erogatore rivestono una particolare importanza: per il minimo affaticamento dell’operatore, essa deve garantire il miglior bilanciamento (anche nel caso in cui la lunghezza sia regolabile, per il più efficace adattamento a operatori di statura diversa) e al contempo avere una superfice antiscivolo. Il tubo erogatore può essere dotato di un robusto anello di metallo all’estremità aperta, per la massima protezione da possibili danni dovuti a colpi e strisciamenti sul terreno. Le prestazioni. Per i soffiatori, i dati salienti riguardano la velocità dell’aria alla bocca di uscita del condotto, spesso aumentata con una configurazione a tubo Venturi, e la portata oraria del flusso. Queste prestazioni sono, come ovvio, strettamente correlate alla potenza del propulsore, anche se la soluzione elettrica, a parità di potenza disponibile, si rivela più efficiente di quella con motore a scoppio. In tema, oltre a diversi modelli a batteria, la Stiga di Castelfranco Veneto (TV) ha in catalogo un soffiatore/aspiratore/trituratore con motore brushless da 2600 W, alimentato a 220 V, con portata massima dell’aria di 420 m³/min e velocità di ben 330 km/h alla bocca di presa, con sacco da 45 l per l’accumulo del materiale intercettato. Il livello sonoro all’orecchio dell’operatore è comunque liproofing headphones or earplugs, which are sometimes supplied as an accessory to the equipment. Noise reduction is important not only in relation to the operator but also with respect to environmental propagation in situations where quiet must be preserved, such as - for example - in the vicinity of dwellings and/or in certain time slots. To this end, the provision of an electric motor greatly reduces noise while also zeroing out the production of noxious gases that, given the proximity of the emission point, could be dangerous to the operator, especially in the long run. The many advantages of electric drive, combined with the technological advancement of rechargeable batteries, have long led to the development of numerous ranges of such blowers alongside those traditionally equipped with endothermic engines. In the electric models, brushless type motors are fitted, powered through efficient lithium-ion battery packs, with charging capacities of several ampere-hours and voltage generally not exceeding 48 V (for safety issues in relation to the danger of electrocution). Incidentally, some manufacturers still offer corded blowers powered by normal 220 V mains power. Types. Several blower models also work easily as vacuum cleaners simply by reversing the direction of fan rotation. In the latter case, there must necessarily be a collecting bag whose useful volume is commensurate with the equipment's working capacity. Usually, professional models are equipped with a container of about 40 liters and more. In some cases, the blower also operates as a shredder of the sucked foliage so as to optimize the filling of the container. A further variable concerns the assembly of the foundational elements of the machine: lighter, mainly hobbyist models consist of a single body, where the motor, fan, rigid blowing tube and accessories are combined into a single unit. Conversely, professional models may have the motor unit and fan back-to-back, i.e., placed in a backpack container, while the blower (or vacuum) duct is flexible and equipped with a handle for orienting it toward the material to be intercepted. On more advanced models, this handle can also be multifunctional, grouping a number of controls into itself so that the implement can be governed with one hand. Moreover, the handle can also incorporate a small monitor of the implement's performance. The position and design of the dispensing hose handle are of particular importance. For minimum operator fatigue, it should provide the best balance (even if the length is adjustable, for the most effective adaptation to operators of different stature) while having a non-slip surface. The dispenser tube can be fitted with a sturdy metal ring at the open end for maximum protection against possible damage from bumps and creeping on the ground. Performance. For blowers, highlights include air velocity at the duct outlet, often increased with a venturi tube configuration, and hourly flow rate. Obviously, this performance is closely related to the power of the engine, although the electric solution, with the same available power, proves to be more efficient than the one with an internal combustion engine. On the subject, in addition to several battery-powered models, Stiga of Castelfranco Veneto (TV) has in its catalog a blower/aspirator/shredder with a 2600 W brushless motor, powered at 220 V, with a maximum airflow of La velocità dell’aria alla bocca di uscita (o di entrata) dei soffiatori/aspiratori può essere aumentata con una configurazione a tubo Venturi The air velocity at the outlet (or inlet) of the blowers/aspirators can be increased with a Venturi tube configuration
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