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Hp = Cp ?

CGB
post 1 Jun 2005, 13:00
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Am vazut ca la datele tehnice la unele masini, in dreptul puterii scrie ba 100CP ba 100HP. Cineva mi-a zis ca HP nu-i tot una cu CP. Stiti ceva de treaba asta?

CP eu stiam ca vine de la Cai Putere iar HP de la HorsePower. Da' cica n-ar fi chiar asa!!!!????!!!!


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VladSoare
post 1 Jun 2005, 13:10
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Ba asa e.


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venom
post 1 Jun 2005, 13:14
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Io stiu asa : HP=Hewlett Pacar...iar CP= Casuta Postala...


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galileo
post 1 Jun 2005, 13:31
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mai exista bhp (british/brake horse power) care e altceva decat hp, nu stiu exact cat e diferenta


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CGB
post 1 Jun 2005, 13:39
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hai bah nu mai faceti misto. ziceti daca stiti ceva.

adica 100cp=100hp=100bhp?


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CGB
post 1 Jun 2005, 13:42
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Nu ma refer la ce inseamna CP sau HP. Ci la valoare.
Adica au aceasi valoare 100 de CP cu 100 de HP sau 100 BHP?


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raducu68
post 1 Jun 2005, 13:43
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British horse power e totuna cu Horse power, ca doar englezii au introdus unitatea de masura (nea Watt cu caii lui...)
Brake horse power e altceva, se foloseste pe la nujce pompe centrifugale pt masurarea randamentului.


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galileo
post 1 Jun 2005, 13:43
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tot cautand, se pare ca 1 bhp e tot un drac cu 1 hp(cp). ramasesem de undeva cu alta impresie dry.gif


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McVic
post 1 Jun 2005, 13:46
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QUOTE(cristib @ Jun 1 2005, 01:42 PM)
Nu ma refer la ce inseamna CP sau HP. Ci la valoare.
Adica au aceasi valoare 100 de CP cu 100 de HP sau 100 BHP?

CP = cal putere
HP = horse power

100 hp = 143 cp

Explicatia de pe net(nu mai gasesc unde am citit) este: calul englezesc este mai puternic datorita vegetatiei si atmosferei. Poate e solul de vina.


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cp
post 1 Jun 2005, 14:56
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BHP and HP
All the B means is "brake". The old word for a dyno - because the engine torque was measured by applying a brake to the flywheel rather than a torque converter or electrical motor which is how it's done nowadays. There's no other difference between the two and they both just mean horsepower.

1 metric HP = 1 Pferdestarke (PS) = 1 cavalli = 1 cheval (CV) = 1 cal putere(CP) = 0.7355 kW


Mesures SAE
1 BHP (British Horse Power) = 1 HP = 0.7457 kW

Asadar:
BHP(British Horse Power) este putin diferit de HP.
BHP(Brake Horse Power) este chiar HP.


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Race
post 2 Jun 2005, 11:12
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Diferenta intre ele nu a mare,e neglijabila.
Asta e un exemplu (unic din cate stiu eu) de prostie europeana.Sa aproximeze o unitate de masura imperiala prin cele metrice cat sa dea rotund e curata tampenie (faza a pornit de la faptul ca 1 HP nu se masura exact in watti si l-au aproximat ca 75 kg*....nu mai stiu ce).
Partea trista e ca in reviste/cataloage,mai ales cele romanesti care scriu CP,nu prea stii la care se refera.


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meganusedanu
post 2 Jun 2005, 12:19
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micile diferente intre hp si cp sunt date de convertirea kw in aceste masuri.Dupa cum stiti un kw are dupa virgula mai multe cifre zecimale pe care daca le iei in calcul la inmultire pot schimba cu putin marimea calului putere


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eddie33
post 2 Jun 2005, 13:06
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Meganusedanu,cred ca nu ai pus virgula bine,de 60 kw ti-au dat 82 c.p. sau mai ai tu 2 cai ?


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Race
post 2 Jun 2005, 13:26
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NU !
A fost explicat bine mai devreme,insa daca nu e clar hai sa detaliem:

Putere mecanica inseamna derivata energiei(lucrului mecanic) dupa timp.
Pentru cresteri liniare inseamna chiar L/t.
Lucrul mecanic e integrala fortei dupa distanta,in caz liniar L=F*d
Deci P=F*d/t pentru cazul clasic de definire a unitatii de masura.

In sistem european 1 watt=1N*1m/1s=kg*m/s^2*m/s=kg*m^2/s^3 (F=m*a)

James Watt a definit calul putere (HP),si fiind englez l-a aplicat la marimile englezesti,masurand cat paote ridica un cal cu un scripete intr-un timp dat.
A ajuns la concluzia ca un cal poate ridica 33.000 livre (pounds,nu stiu daca se traduce chiar asa) cu viteza de 1 picior pe minut.
Deci
1 HP=33.000 pounds*g*1 picior/1 minut (forta exercitata de cele 33.000 livre e masa lor * acceleratia gravitationala-stupida precizare dar nu toti sunt ingineri tongue.gif )
1 HP=33.000*0.4535924kg*9,80665m/(s^2)*0.3048 m /(60 s)
1 HP=745,699920901 kg*m^2/s^3
1 HP=745,7 W= 0,7457 kW

Dupa asta,europenii au ajuns la concluzia ca nu se poate masura in numar intreg de unitati europene,si in magnifica lor idiotenie au venit cu ideea calului putere european.Un PS este puterea necesara sa imprimi undei forte de 75 kgf o viteza de 1 m/s.Un kgf este greutatea unui kilogram la acceleratia gravitationala standard.
1 PS=75kg*9,80665m/(s^2)*1m/s=735,49875W=0,7355kW

Pe scurt:
1 HP=1,01386 PS
1 PS=0,98632 HP

Mare diferenta nu e,dar la puteri mari e de cateva unitati acolo...


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raducu68
post 2 Jun 2005, 13:42
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Si "PS" de la ce vine?


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galileo
post 2 Jun 2005, 13:45
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de la "PferdestÀrke" = horse strength


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