THE SMALL CAT TRUCK-3

petit chat

Favorite little Cat of Maxime the Great Princess!

petit chat

Little bit of math

The truck has been design to use gaz turbine, Hydrogen and it's oxydizer, Oxygen. Let's take a closer look to that concept:

Water Equation

By mass, the ratio of Hydrogen by Oxygen is stoichiometrically 8:1, but in rocketery the NASA use a ratio of 6:1, for ISP(Thrust efficiency) reason:

Water Equation by mass

For this project, I will use the stechio ratio, 8:1. The data of the gaz are:

HydrogenOxygen
Density0.07 g/cm³1.141 g/cm³
Molar Mass116
Boiling Point20.271 °K90.188 °K
Heat of Vaporisation0.904 kJ/mol6.82 kJ/mol
Molar Heat Capacity28.836 J/(mol*K)29.378 J/(mol*K)

The most important in this document is resume on this page:

efficiency

The experimental data give us, from Praxair (a large manufacturer):

Energy Cost

As in the text, the magic number is about 15 kwh/kg of liquid Hydrogen. In it's current draft configuration, the tanks of the truck may contain less than 140 L of liquid. In volume, 1 g / 0.07 g/cm³ = 14.28 cm³, and 8 g / 1.141 g/cm³ = 7.01 cm³, and the ratio is 14.28 / 7.01 = 2.04:1. In the tanks, 93L of Hydrogen and 47L of Oxygen.

Capucin Cost

Capucin Cost

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