Esoteric106

Ok I think I got the part I was missing I néed to convert the fuel/O2 flow to mass instead of kg/sec so th/(fuel mass) to get the Isp to average in to the entire stage/rocket? ?

I'm really slow with picking up math...inverse of isp?

Monstah thank you you have explained it perfectly and that what I was missing /having a hard time understanding. It clicked now I think I'll try the math when I get home on a rocket and see what I get. If you don't mind I'll post my results and se if I'm right.... (the only math background I have is 20 years of being a carpenter) I know I am a very small minority being i want to learn the math and use no mods but it's way more enjoyable to me to plan out a mission calculate the math and burns like we did when space exploration still meant some thing Again thank you all very much

Will try that thank you

So now how would you equate srbs that would drop off mid burn of another engine? Thank you again by the way

so if I have 1 at 650 and 2 at 350 the equation would be 9.8*((650+350+350)/3)*ln (25.5/13.5) I would get 2 807.572 410 685 43 as my delta v correct? made up numbers btw

I could use some help. I'm trying to figure out how to do the math to figure out my delta v for multI engine design with different isp I'm not getting the explanations.I can find. No I don't want to use any mods Thank you in advance