## 1 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

5m ago by NatsM  NatsM  5m ago

*Typo. There should be a / before 0.99988

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