(1/9) Most of us know the rocket engines used on #ISRO's rockets. But not as many know the smaller engines they built for use on their satellites to perform precise orbit raising/trajectory correction burns.

Let's get familiar with some of the lesser known engines of ISRO 🧵 (2/9) But first we gotta learn a few terms. A rocket engine runs in Blowdown or Regulated mode.

In Blowdown mode the propellant is pressurized with a fixed amount of helium. So as prop. is consumed, the pressure in the prop. tanks decreases.

We all love rocket launches! But what happens before the launch rarely gets noticed. So here's a thread on how @isro tests their satellites! First the newly built satellite is placed in one of ISRO's ovens at their Thermo Vacuum facility where a vacuum is pulled and IR lamps heats the satellite to upto 150°C to simulate the harsh conditions of space and see if the satellite can survive them.