Further, the force-velocity curve becomes more linear with increasing temperature ( curv values increase Ranatunga, 1984). It has generally been found that slow muscles (ST-slow twitch) exhibit a larger curvature of the force-velocity relationship (corresponding to smaller curv values) than fast ones (FT-fast twitch) ( Close, 1972). Typical curv values for different species are in the range of 0.25. In the case N N=6 (d N=0.34 mm), six jets having a notably lower power of P N=7 kW each, are formed that work very gently and do not damage any underlying material. Therefore, the hydraulic power can be divided into several portions by using various nozzles or orifices. However, this variant is not suitable for selective paint stripping as there is a risk that the underlying material layer will be damaged. 3.19b, is very favourable for performing heavy material removal work, such as exposing reinforcement bars.

In the case N N=1 (which gives d N=0.85 mm), the entire hydraulic power delivered by the pump is focused in one jet that owns a high power of P N=42 kW (if nozzle losses are considered). If a typical job performed with a hand-held gun with p=200 MPa and Q Л™ N=20 l/min is considered, the following situation appears. The resulting performance ranges are of great practical importance.

In a diagram for a hand-held gun, each hyperbola is a line of constant orifice cross section (or constant volumetric flow rate, or constant hydraulic power, respectively). Momber, in Hydrodemolition of Concrete Surfaces and Reinforced Concrete, 2005 3.5.3 Performance rangesД®quation (3.25) suggests a hyperbolic relationship between orifice diameter and orifice number.

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