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Cx La Megane, Coeficient de aerodinamicitate

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Sneferu
post 9 May 2005, 19:26
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Salut,

am scormonit netu' dar de data asta tata'google nu a vrut sa spuna.

Stie cineva care este coeficientul de aerodinamicitate la megane sedan?

Toate bune,
s


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R19/16v
post 9 May 2005, 20:02
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AERODYNAMISME
Scx 0,690


de la bunul nostru prieten www.renault.fr

cu toate ca mi se pare mare...poate exista ceva ce eu nu cunosc aici...


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raducu68
post 9 May 2005, 21:01
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Pai Scx nu-i totuna cu Cx smile.gif

Scx = S * Cx, unde S = suprafata frontala, iar Cx = coef. aerodinamicitate

Cx-ul e 0.35 la Megane2. S-ul il poti calcula si singur wink.gif -> 0.69 / 0.35


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cipman
post 9 May 2005, 21:22
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La Hatch e 0.34. Probabil ca la sedan e cam 0.35. Tot aia e.

Folosirea SCx e utila pentru calcule. Se exprima in metri patrati.

De exemplu, Pa, puterea consumata la inaintare prin aer:

Pa= SCx * V^3 /56000 [CP], unde V e viteza, exprimata in km/h

De ex. la 200 km/h > Pa= 0.69*200^3/56000= 98.6 [CP]


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Megane II.1 Estate Priv 1.6 16V 2005, gri D69, clima+scaune
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R19/16v
post 10 May 2005, 07:52
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Varsta isi spune cuvantul smile.gif


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cmandrei
post 10 May 2005, 09:38
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Daca tot stiti imi spuneti si mie ... cum e mai bine sa fie aceasta valoare "coeficient de aerodinamicitate" mai aproape de 1 sau de 0 ?


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VladSoare
post 10 May 2005, 09:43
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Trebuie sa fie cit mai mic. GM scosese acum citiva ani un prototip electric care avea un fenomenal 0,19!
Nu mai stiu teoria insa, adica nu mai stiu cum se masoara si ce reprezinta. Am citit-o cindva, insa n-am retinut-o.


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cipman
post 10 May 2005, 09:45
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@cmandrei: Poi nu rezulta din relatiile de mai sus, mos Andrei? Tre' sa fie miiic, miiiiiic de tot. Mai mic decat ..beep-ul.. de furnica.

@R19/16v: Ha? Care varsta? A masinii sau a posesorului?


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Megane II.1 Estate Priv 1.6 16V 2005, gri D69, clima+scaune
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cipman
post 10 May 2005, 09:59
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Cx este numit si factorul de forma. Nu-i acelasi lucru sa ai un obiect cu o arie transversala de 1 mp in forma de paralelipiped (gen camion) sau aceeasi arie apartinand unui planor. Ambele obiecte, desi au aceeasi arie transversala, intampina o rezistenta diferita din partea aerului.
Fiind un coeficient, adica o cantitate fara unitate de masura, nu se masoara ci se obtine din calcule. Se pune obiectul in tunelul aerodinamic, se masoara forta necesara sa-l tii pe loc sa nu ti-l sufle aerul afara, daca nu stii aria o masori prin proiectie si aia e.
Si, la sfarsit, daca e tunelul tau si obiectul altuia, faci factura de vreo 100.000 de coco. Fara tva.


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Megane II.1 Estate Priv 1.6 16V 2005, gri D69, clima+scaune
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R19/16v
post 10 May 2005, 10:30
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cipman smile.gif vorbeam de varsta celor care m-au corectat...a ta si a lui raducu...
n-am spus-o cu nici un fel de intentie de a face misto!


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cipman
post 10 May 2005, 10:37
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Nici n-am luat-o ca fiind la misto. Doar ca nu vad ce legatura are varsta si cu ce. Dar probabil ca n-am inteles eu. Scuze.


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Megane II.1 Estate Priv 1.6 16V 2005, gri D69, clima+scaune
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post 10 May 2005, 10:52
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varsta are legatura cu experienta smile.gif


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raducu68
post 10 May 2005, 14:45
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Din clasa Meganului cel mai mic Cx il are C4, 0.29 parca mad.gif


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cipman
post 10 May 2005, 14:52
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O avea el 0.29, da' n-ai vazut cum se dezmembreaza? Bucati-bucati. De zici ca-i robot nu altceva.


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clau023
post 23 May 2005, 23:54
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biggrin.gif Hahaha.........e tare!

This post has been edited by cmandrei: 13 Mar 2006, 16:53


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cornel_t
post 24 May 2005, 06:56
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Stati linistiti ca il "asambleaza" Tariceanu la loc, chiar ma intreb cand o sa mai traga un tun ca cel din guvernarea trecuta cand a vandut dint-un foc 4000 masini la Posta Romana.


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