Weird phenomenon when adding multiple engines to a fuel tank

[VlonaldKerman]

Test this out: put a Mk1 Command pod on top of two of the long medium hydrogen tanks and attach the NERV. Then add more nervs to the bottom of the tank. dV goes WAY down, and TWR doesn’t go up nearly as much as I would expect. This seems similar to the phenomenon I encountered on the last patch where a stack that should give 5200 kN actually gave <3300 kN.

Am I stupid?

[Fullmetal Analyst]

 

1 minute ago, VlonaldKerman said:

Am I stupid?

did you ever look at the weight of these engines?

[Chilkoot]

Your dV is going down b/c you are more than doubling the mass of your entire ship when you add those extra NERVs at the bottom - that also affects TWR scaling, as you are not just adding thrust, but also adding significant weight.

[VlonaldKerman]

How come the same thing happens when I do this with my 1st stage booster engines tho?

[shdwlrd]

The tyranny of the rocket equation. What you think may help actually hurts you.