The most reliable method to test a rocket or an aerospace vehicle is by launching or flying it. However, if one is to design an all-new aerospace vehicle and intends to validate the newly-developed prototype, the preliminary step would be to test it in a wind tunnel.

160-metre trisonic wind tunnel to help ISRO test, validate future space vehicle designs

Now American President and then (1992) Senator from Delaware, Joseph R Biden played a crucial role in denying India the Cryogenic engine technology that powers India's GSLV series of heavy-lift rockets.

When Joe Biden denied India space tech, called it 'dangerous', US delayed India's space programme

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160-metre trisonic wind tunnel to help ISRO test, validate future space vehicle designs

When Joe Biden denied India space tech, called it 'dangerous', US delayed India's space programme