• 0
Sign in to follow this  
ineon

Command modules vs passenger modules + probe

Question

I am optimising a spaceplane that I successfully got to orbit, docked and de-orbited. It flies really nicely, has great manoeuvrability, can land really gently but could do with a bit of work getting it to dock nicely. It has 2 Mk1 Inline Cockpits, and I think that I want to change it for a Mk1 Crew Cabin. I am going to use it for crew rotations - no cargo.

Detailed analysis if you really want it:

Spoiler
Original
Part Mass Cost Electricity Monoprop Torque
Mk1 Cockpit 1.03 1600 50 7.5 10
Mk1 Cockpit 1.03 1600 50 7.5 10
Total 2.06 3200 100 15 20
New
Part Mass Cost Electricity Monoprop Torque
Mk1 Crew cabin 1 550      
Probodyne HECS 0.1 650 10   0.5
1.25 Service bay 0.1 500      
Z100 battery 0.01 80 100    
FL R10 RCS tank 0.37 200   80  
Advance Stabiliser 0.1 1200     15
Total 1.67 3180 110 80 15.5

The advantages that I see are that it does not require a pilot to be one of the crew that is rotating, as well as being marginally lighter and cheaper (20Kerbucks saved - woo:)) and the other specs are about the same. I could also use it for tourists too. Having a cargo bay has the small advantage that I can put other radially attached parts in there too to avoid drag (mechjeb is the main one).

The big disadvantage is that if I loose power then I am completely dead in the water space, whereas if I had a command module I could at least manoeuvre using RCS or control surfaces, or fire the engine when I am pointing in approximately in the right direction. Another small disadvantage is that there are 3 things in the plane instead of 2, this makes it slightly longer and has more places for it going spaghetti on me (it does have enough lift to tear itself apart at mach3 under 10km altitude).

I guess that I have a few more options in placing components wrt getting the CoM in the right place, but equally more complexity.

Any more advantages or disadvantages that I have missed?

Share this post


Link to post
Share on other sites

2 answers to this question

Recommended Posts

  • 0

Are you docking, or just EVAing Kerbals across? If not then just skip the whole RCS system.

Take a small battery and right-click it, you can then lock it out the same way you would a fuel tank, that way if you run out of power you have an emergency backup supply, at least enough to turn you towards the sun.

Share this post


Link to post
Share on other sites
  • 0
6 minutes ago, WhiteKnuckle said:

Are you docking, or just EVAing Kerbals across? If not then just skip the whole RCS system.

Hmmm... If I am only doing crew rotations, then you are right, and I can get rid of all that drag from RCS thrusters.

7 minutes ago, WhiteKnuckle said:

Take a small battery and right-click it, you can then lock it out the same way you would a fuel tank

I completely forgot about that. Well remembered.

Share this post


Link to post
Share on other sites
This thread is quite old. Please consider starting a new thread rather than reviving this one.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this