It can be a different propellant, there are constantly new propellants developed. in the US civilians are even allowed to develop their own if they have a hobby rocketry license ( https://www.youtube.com/watch?v=DWSYZ2uEpnM ) .
Material sciences are constantly evolving and new formulas and combinations of substances are found all the time.
Edit:
New motors have even started using more reactive metals as fuel because it’s now possible to make thinner shells that can hold higher stress and temperatures for the same or even less mass.
One place where this is seen very obviously as an example is the IRIS-T and the IRIS-T SLM where the original version has a yellow flame while the updated version with more propellant has a redder flame.
They are just not. You have very hard limits for solid propellant and you are not beating them. New propellants only solve questions like stability under conditions or toxicity. They are not getting ANY more performance because that’s limited by physics.
Magical improvements in rockets just dont exist and is pure cope from american players here
Jagm uses hellfire motor which makes it as fast, jagm-mr uses even better motor so it literally makes senese that it should be same speed if not faster than a hellfire
Prove they have stagnated. Material science is always improving so why wouldn’t it apply to solid rockets, where there is clearly tons of demand for improved performance
The limit of rocketry has been the casing holding the forces as they increase and still forcing them out of the nozzle instead of exploding. You can easily increase the power of a propellant practically almost indefinitely until you get a bomb. The limiting factor is the casing holding everything together without weighing to much for the forces to move the object.
Im going to describe to you a scenario:
-You time travel 300 years in the past in europe and meet a peasant
-You tell him that its possible for two people from different continents using a little box with lights.
-Do you think that the peasant just agrees with you? No, he gets his village to hang you in the square for proposing such witchcraft.
Just because something doesnt exist yet (to your knowledge) , doesn’t mean its necessarily impossible. You cant know exactly what the Americans are doing with their rocket tech.
But there has been changes in designing the shape of the inside for faster/slower burns, designing different grainsizes of the component for different effects. There has been discoveries of new molecules that have a way more efficient oxidising effect meaning you need less mass of oxidiser for the same effect. We also have a WAY greater access to metals that are way more reactive (lithium for example) that require less metal for the same energy expulsion (or you know, same mass for more energy).
