There are 2 orbits:
- Circular orbit with 200km altitude
- Circular orbit with 800km altitude
The space tug is already on the first orbit. Its dry mass is 960kg, the total mass of fuel is 5250 kg. It supplies a satellite from the first orbit to the second.
Using the Hohmann transfer, I got the first impulse ≈ 168 m/s, the second ≈ 164 m/s. Using the Tsiolkovsky equation (assuming Isp=331s) I calculated, that the maximum mass of payload may be ≈ 47 tons!
Is this theoretically correct? Is this practically feasible?