1 My Take On The Hennessey Venom F5

Cover for My Take On The Hennessey Venom F5

First, using my own formulas and method then compared it to the standard method and formulas. Hennessey claims a 311 mph or higher top speed. Using these specs and parameters, it calculates to 314.70 mph using standard formulas. My formulas and method calculated it at 313.41 mph — just about there. I used a standard 42.5 psi with the corresponding 0.0908 rolling coefficient. Had I used a higher tire pressure such as 49.0 psi which is often used in top speed runs, the calculated speed will also be higher than 313.41 mph — 315.18 mph with the corresponding rolling coefficient of 0.0803. We'll see in the future.

https://www.hennesseyspecialvehicles.com/2021-venom-f5/

Hennessey Venom F5

Hc = (0.00000556517pAfCdS^3+ 0.0026667CrSWt)/Pf -> my formula

Pf = 5,252Hc/EpTp -> my formula

Where:
Hc = Horsepower 1,817 (1,842 PS)
EP = 8,000 rpm
Tp = 1,193 lb-ft @5,000 rpm -> 1,617 Nm
p = 1.204 kg/m^3
Af = 19.60 sq ft -> 1.821 sq mt
Cd = 0.39
S = 313.41 mph @42.5 psi
Wt = 2,998 (car); 165 (driver) = 3,163 lbs -> 1,434 kgs
Pf = 0.99988
Cr = 0.0908 @42.5 psi, 313.41 mph; 0.0803 @49.0 psi, 315.18 mph
P = 1,354,937 watts
n = 0.090

1,817 = [(0.00000556517x1.204x19.60x0.39x313.41^3) + (0.0026667x0.0908x313.41x3,163)]0.99988

Using the standard power equation

Pn = [0.5pCdAV^2+ Cr(M+Df)g]V, with 0.90 drivetrain efficiency and 0.015 rolling coefficient, the top speed translates to 314.70 mph.

1,354,937*0.090 = (0.5x1.204x0.39x1.82x140.68^2 + 0.015x1,434x9.8067)140.68
= (8,457 + 211)140.68
= 8,668x140.68
1,219,443 ≈ 1,219,414 watts

1w ago by NatsM
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NatsM  1w ago

*Typo. There should be a / before 0.99988