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[Gaio]

Ecco due link interessanti...(almeno per me  )

http://www.bobnorwood.com/300%20mph%C2%A0%20The%20Aerodynamics%20of%20Drag%20and%20Power.htm
Questo link ribadisce il legame tra velocità al cubo e la potenza assorbita. Vedere esempio 228-GTO su come ottenere, data la potenza assorbita ad una data velocità, la potenza assorbita ad un'altra velocità (senza conoscere esplicitamente tutti gli altri parametri.

http://ecomodder.com/forum/tool-aero-rolling-resistance.php
Questo è un vero è proprio calcolatore on-line:

MPH   KM/H   Aero (a)   Rolling (b)   Total   % Aero   % Rolling   Watts   HP   HP Aero   HP Rolling   MPG(US)   L/100km
5   8   2.75   142.20   144.94   1.90%   98.10%   323.98   0.43   0.01   0.43   167.28   1.41
10   16   10.99   142.20   153.18   7.17%   92.83%   684.79   0.92   0.07   0.85   158.28   1.49
15   24   24.72   142.20   166.92   14.81%   85.19%   1,119.28   1.50   0.22   1.28   145.26   1.62
20   32   43.95   142.20   186.14   23.61%   76.39%   1,664.28   2.23   0.53   1.70   130.25   1.81
25   40   68.67   142.20   210.87   32.57%   67.43%   2,356.63   3.16   1.03   2.13   114.98   2.05
30   48   98.88   142.20   241.08   41.02%   58.98%   3,233.17   4.34   1.78   2.56   100.57   2.34
35   56   134.59   142.20   276.79   48.63%   51.37%   4,330.74   5.81   2.82   2.98   87.60   2.69
40   64   175.79   142.20   317.99   55.28%   44.72%   5,686.16   7.63   4.22   3.41   76.25   3.08
45   72   222.49   142.20   364.68   61.01%   38.99%   7,336.29   9.84   6.00   3.84   66.48   3.54
50   80   274.68   142.20   416.87   65.89%   34.11%   9,317.95   12.50   8.23   4.26   58.16   4.04
55   89   332.36   142.20   474.56   70.04%   29.96%   11,667.98   15.65   10.96   4.69   51.09   4.60
60   97   395.53   142.20   537.73   73.56%   26.44%   14,423.23   19.34   14.23   5.11   45.09   5.22
65   105   464.20   142.20   606.40   76.55%   23.45%   17,620.53   23.63   18.09   5.54   39.98   5.88
70   113   538.37   142.20   680.56   79.11%   20.89%   21,296.71   28.56   22.59   5.97   35.63   6.60
75   121   618.02   142.20   760.22   81.30%   18.70%   25,488.62   34.18   27.79   6.39   31.89   7.38
80   129   703.17   142.20   845.37   83.18%   16.82%   30,233.09   40.54   33.72   6.82   28.68   8.20
85   137   793.82   142.20   936.01   84.81%   15.19%   35,566.95   47.70   40.45   7.25   25.90   9.08
90   145   889.95   142.20   1,032.15   86.22%   13.78%   41,527.06   55.69   48.02   7.67   23.49   10.01
95   153   991.58   142.20   1,133.78   87.46%   12.54%   48,150.24   64.57   56.47   8.10   21.39   11.00
100   161   1,098.71   142.20   1,240.90   88.54%   11.46%   55,473.33   74.39   65.87   8.52   19.54   12.04
105   169   1,211.32   142.20   1,353.52   89.49%   10.51%   63,533.16   85.20   76.25   8.95   17.91   13.13
110   177   1,329.43   142.20   1,471.63   90.34%   9.66%   72,366.59   97.05   87.67   9.38   16.48   14.28
115   185   1,453.04   142.20   1,595.24   91.09%   8.91%   82,010.43   109.98   100.17   9.80   15.20   15.48
120   193   1,582.14   142.20   1,724.33   91.75%   8.25%   92,501.54   124.05   113.82   10.23   14.06   16.73
125   201   1,716.73   142.20   1,858.93   92.35%   7.65%   103,876.75   139.30   128.65   10.66   13.04   18.03
130   209   1,856.81   142.20   1,999.01   92.89%   7.11%   116,172.89   155.79   144.71   11.08   12.13   19.39
135   217   2,002.39   142.20   2,144.59   93.37%   6.63%   129,426.81   173.56   162.06   11.51   11.31   20.81
140   225   2,153.46   142.20   2,295.66   93.81%   6.19%   143,675.34   192.67   180.74   11.93   10.56   22.27
145   233   2,310.03   142.20   2,452.23   94.20%   5.80%   158,955.31   213.16   200.80   12.36   9.89   23.79
150   241   2,472.09   142.20   2,614.29   94.56%   5.44%   175,303.57   235.09   222.30   12.79   9.27   25.36
155   249   2,639.64   142.20   2,781.84   94.89%   5.11%   192,756.95   258.49   245.28   13.21   8.72   26.99
160   257   2,812.69   142.20   2,954.89   95.19%   4.81%   211,352.30   283.43   269.79   13.64   8.21   28.67
165   266   2,991.23   142.20   3,133.42   95.46%   4.54%   231,126.44   309.95   295.88   14.07   7.74   30.40
170   274   3,175.26   142.20   3,317.46   95.71%   4.29%   252,116.21   338.09   323.60   14.49   7.31   32.18
175   282   3,364.79   142.20   3,506.99   95.95%   4.05%   274,358.46   367.92   353.00   14.92   6.91   34.02
180   290   3,559.81   142.20   3,702.01   96.16%   3.84%   297,890.02   399.48   384.13   15.34   6.55   35.91
185   298   3,760.32   142.20   3,902.52   96.36%   3.64%   322,747.73   432.81   417.04   15.77   6.21   37.86
190   306   3,966.33   142.20   4,108.53   96.54%   3.46%   348,968.42   467.97   451.78   16.20   5.90   39.86
195   314   4,177.83   142.20   4,320.03   96.71%   3.29%   376,588.94   505.01   488.39   16.62   5.61   41.91
200   322   4,394.83   142.20   4,537.02   96.87%   3.13%   405,646.11   543.98   526.93   17.05   5.34   44.01
Usando questi dati per la mia megane 2.0dci

Vehicle weight: 1450 kg / 3196.7028016807 lbs (include il guidatore)
Crr: .01 (rotolomento pneumatici)
Cd: .34 (è il Cx)
A: 2.6 m2 / 28.416723500114 ft2 (larghezza per altezza)
Fuel energy density (Wh/US gal.): 33557 (Boh...ho selezionato diesel
Engine efficiency: .34 (tipico per un motore diesel - vedi Quattroruote)
Drivetrain efficiency: .95
Parasitic overhead (Watts): 0
rho: 1.225 kg/m3 (densità aria)

MPH   KM/H   Aero (a)   Rolling (b)   Total   % Aero   % Rolling    Watts   HP   HP Aero   HP Rolling   MPG(US)   L/100km
130   209   1,856.81   142.20   1,999.01   92.89%   7.11%   116,172.89   155.79   144.71   11.08   12.13   19.39
135   217   2,002.39   142.20   2,144.59   93.37%   6.63%   129,426.81   173.56   162.06   11.51   11.31   20.81

Post Unito: 19 Gennaio 2013, 01:09:11In pratica leggendo le ultime 2 righe con 160 CV la velocità max è di oltre 210km/h con un consumo di circa 20l/100km. In ottimo accordo alla mia esperienza nei migliori risultati da me ottenuti (accelerando progressivamente senza schiacciare a fondo acceleratore)


Ciao a tutti.