[sama]

You can usually find some intermediate milestone to prove to investors you're more than just a talker.

[fooshint]

Do you have any examples?

[petra]

Build a simulation(in some multiphysics simulation tool) that shows your concept may work and can be validated by a 3rd party.

[argonaut]

That not a great example. A better one is to build a v0.00000001 that actually works but is obviously not the final product nor even an MVP. E.g. a technical demonstration of some component.

[lmm]

Can you get more concrete? "a technical demonstration of some component" isn't really an example.

[argonaut]

My point is, a simulation is not going to impress anyone.