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Performante de zbor

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AEROCLUBUL ROMÂNIEI<br />

2.3.3 Panta maxima si inci<strong>de</strong>nta maxima<br />

Urcarea este miscarea uniforma si rectilinie ce o executa o aeronava pe o<br />

traiectorie ascen<strong>de</strong>nta.<br />

Conditii:<br />

- G1 = Gcos θu;<br />

- G2 = Gsin θu.<br />

Fig 2.32. Zborul in urcare<br />

un<strong>de</strong>:<br />

G = greutatea aeronavei;<br />

Fz = forta portanta;<br />

Fx = forta <strong>de</strong> rezistenta la inaintare;<br />

Ftu = forta <strong>de</strong> tractiune (urcare);<br />

θ = unghiul <strong>de</strong> urcare; - unghiul format <strong>de</strong> directia avionului cu directia vitezei pe<br />

traiectorie.<br />

Ftu = Fz + G2 = Fz + Gsinθ = (ρV2 / 2) SCx + Gsinθ;<br />

Fz = Gcosθ = (ρV2 / 2) SCz;<br />

S = suprafata aripii;<br />

ρ = <strong>de</strong>nsitatea aerului;<br />

Cz = coeficientul <strong>de</strong> rezistenta la inaintare;<br />

Cx = coeficientul <strong>de</strong> portanta.<br />

Pentru mentinerea vitezei <strong>de</strong> urcare constanta este necesar sa se<br />

realizeze Ftu = Fz + G2;<br />

un<strong>de</strong> G2 este completat <strong>de</strong> suplimentul <strong>de</strong> tractiune ΔFt, necesar pentru a<br />

mentine aeronava pe panta.<br />

<strong>Performante</strong> <strong>de</strong> <strong>zbor</strong> si planificarea <strong>zbor</strong>ului februarie 2011<br />

<strong>Performante</strong> 42

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