Internal Combustion Engines
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

6-12 kg/cm² and 250-350°C
4-6 kg/cm² and 200-250°C
20-30 kg/cm² and 450-500°C
12-20 kg/cm² and 350-450°C

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Internal Combustion Engines
If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

(V₀/V₁)/ [1 + (V₀/V₁)²]
V₁/(V₀ + V₁)
V₀/(V₀ + V₁)
[2(V₀/V₁)]/ [1 + (V₀/V₁)²]

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