a605019098

I am so sorry to I couldn't express my question nicely.But you understand what I want to ask(bad Google translator). I saw you haven't balanced the parts.I hope BE-4 is BE-4 instead of KE-4,(like RS-25 and KS-25).

Good job, I look forward to your mod, but I have a question about be-4's technical parameter like Isp or mass,which will you do?