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Performante de zbor

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AEROCLUBUL ROMÂNIEI<br />

Avem trei viteze pe panta <strong>de</strong> urcare:<br />

Vu = viteza indicata <strong>de</strong> aparat pe traiectoria <strong>de</strong> urcare (vitezometru – km/h);<br />

V = componenta orizontala a lui Vu (viteza fata <strong>de</strong> sol – km/h);<br />

Wu = viteza ascensionala, citita la variometru (m/s).<br />

Factori <strong>de</strong> influenta:<br />

a) Greutatea; daca greutatea creste, rezulta ca si viteza <strong>de</strong> urcare (Vu) va<br />

creste.<br />

b) Inaltimea; daca inaltimea (H) creste, ρ va sca<strong>de</strong> <strong>de</strong> un<strong>de</strong> rezulta ca viteza<br />

<strong>de</strong> urcare (Vu) va creste.<br />

c) Inci<strong>de</strong>nta; daca unghiul <strong>de</strong> inci<strong>de</strong>nta (α) creste, Cz va creste, <strong>de</strong> un<strong>de</strong><br />

rezulta ca viteza <strong>de</strong> urcare (Vu) va sca<strong>de</strong>.<br />

d) Unghiul <strong>de</strong> panta (θ); daca unghiul <strong>de</strong> panta creste va rezulta o sca<strong>de</strong>re a<br />

vitezei <strong>de</strong> urcare (Vu).<br />

Unghiul <strong>de</strong> panta <strong>de</strong>pin<strong>de</strong> numai <strong>de</strong> valoarea exce<strong>de</strong>ntului <strong>de</strong> tractiune<br />

(ΔFt), la o anumita greutate (G) <strong>de</strong> <strong>zbor</strong>. Valoarea acestuia la diferite viteze <strong>de</strong><br />

<strong>zbor</strong> se pune in evi<strong>de</strong>nta prin suprapunerea curbelor <strong>de</strong> variatie a tractiunii<br />

necesare pentru o greutate (G) si o inaltime (H) constante si a tractiunii<br />

disponibile pentru toata gama unghiurilor <strong>de</strong> inci<strong>de</strong>nta (α).<br />

Fig 2.33.<br />

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

<strong>Performante</strong> 43

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