Internal Combustion Engines
A fuel of cetane number 40 has the same ignition quality as a mixture of

40% cetane and 60% alpha methyl naphthalene
40% petrol and 60% diesel
40% diesel and 60% petrol
40% alpha methyl naphthalene and 60% cetane

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

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