It is important because it is essential for for climbing of aircraft. There is a limit for thrust to weight ratio. When an airplane exceeds it, it cannot climb effeciently.
A thrust to weight ratio of 1:1 is good on RC planes so I'd recommend 5KG of thrust
An F-16's max take-off weight is 42,300 pounds
Lift, weight, thrust and drag.
Lift equals weight and thrust equals drag.
Empty Weapons:18,200 Ib;max take off 27,200 Ib.
lift and thrust overcome weight and drag
Solid fueled rocket engines are relatively simple in design, have a high thrust-to-weight ratio, and are easy to store and transport. Additionally, they can provide a lot of thrust in a short amount of time, making them ideal for quick acceleration needs.
As long as the thrust is more than the weight of the rocket (toy or otherwise) the rocket will accelerate. When the thrust matches the weight, the rocket will cruise. When the thrust is less then the rocket will slow.
Thrust is the force generated by an engine to propel an object forward, like an airplane. Weight is the force of gravity acting on an object, pulling it downward towards the Earth. In order for an object to fly, the thrust generated by its engines must be greater than its weight.
The payload's weight
F-16C (Block 30) has a max take-off weight of 42,300 lb (16,875 kg) .