How much delta V is required to get back from the Munar surface?

[Cadet_BNSF]

I am trying to design a disposable probe that can land on the Mun. It will have a bunch of science experiments that I don't want to haul back, so I am designing a tiny ascent stage to get back to Kerbin.

This is the basic idea

The service bay will hold all of the experiments

Edited April 22, 2017 by Cadet_BNSF
Clarifying question

[IncongruousGoat]

From the surface? Well... orbital velocity is around 500 m/s, and escape velocity around 700 m/s, so call it 850 m/s delta-V for gravity losses and in case my estimate is off.

[Cadet_BNSF]

Thanks

[Reactordrone]

From equatorial low Munar orbit I usually budget 280m/s.

[Spricigo]

The return probe can be further optimised a bit (heatshield,  battery,  decoupler, drogue are convenient but not really necessary ; OX-STAT can provide enough electricity)  but is already capable enough.  

Also,  for a craft so small,  just a bit of fuel will give lots of deltaV. 

[Draalo]

You can look up dV rquirements on this dV map:

http://wiki.kerbalspaceprogram.com/wiki/Cheat_sheet

[Foxster]

I was messing with the same concept a while ago. The difference though was that I used a Mun hopper craft with a scientist to reset the experiments, who got abandoned on the Mun. The science return craft was pretty much like yours. 

Couple of things to watch for with your craft:

Those sticky-out bits are likely to cause a lot of heat during re-entry. 

The octo probe core sticks out from that size heatshield and, again, you may get over-heating issues. 

The one chute will do it without a drogue too.

Here's the last Ant-powered iteration I was using. It has a PB-NUK clipped inside:

 

Edited April 22, 2017 by Foxster

[bewing]

I agree with Spricigo -- if you want to optimize, then forget the second stage separator, the drogue chute, and the heatshield. Even with an engine attached, it will come into Kerbin nose-first. And it will slow down very fast all by itself, and probably won't have a single heating issue because it will be so light and will slow down so fast. And yes, I figure about 850 deltaV to return from the Mun, as IncongruousGoat said.