how to caculate delta v with boosters?

[yog-sothoth]

i am trying fow a mun mission and i want to know how many(if any) srbs i need. i am using an online delta v calculator and want to know how to calculate with srbs. can anyone help?

[GoSlash27]

Well...

 SRBs should only be used in the early going. They're very cheap and powerful, but heavy and inefficient. Not worth carrying any serious distance.

 Calculating DV with them is the same as any other rocket; the natural log of the wet/dry mass ratio times the exhaust velocity. When combining them with other engine types, the specific impulse is scaled proportionally to the mass flow rate. Most calculators should be able to calculate this given thrust and specific impulse of the engines firing in parallel.

HTHs,
-Slashy

[Raideur Ng]

http://www.strout.net/info/science/delta-v/

Start with your final stage, and as you add stages under it, lock the fuel and take readings off the Build Aid. Works quite well, The Build Aid ought to be in the default game, honestly.

[Snark]

Note that it can be tricky to get the exact dV contribution from SRBs, assuming you stage them right off the pad, since they get a significantly higher Isp in vacuum than at sea-level pressure.  You can probably get in the right ballpark if you use an Isp value that's the average of vacuum and ASL.

(That's true of any rocket engine, not just SRBs, but it comes up with them a lot because, 1. you're generally always firing them right off the pad, and 2. the gap between vacuum and ASL Isp is somewhat bigger for SRBs than it is for "atmospheric" rocket engines like the Reliant, Mainsail, Skipper, etc.)

[Benjamin Kerman]

Check out the wiki, the other wiki page. I had asked this question before, so check out these threads also: