• 1
JacobJHC

Can someone explain fuel flow priority?

Question

I am confused on the new fuel priority system that 1.2 added. I like the idea but am still confused. Does adding numbers mean more fuel flows out or does a higher number mean that more fuel flows out? Thanks

Share this post


Link to post
Share on other sites

10 answers to this question

Recommended Posts

  • 2

tanks with higher numbers will drain before lower ones,  so you could break down your tanks and have them drain bottom to top

eg.  53 for the lowest, 52 for the next, then 51, and finally  50. 

Share this post


Link to post
Share on other sites
  • 1
1 hour ago, jpinard said:

The numbers go from negative to positive.  So if I have a lower tank I want to drain before an upper one, do I assign the lower tank P1?  Or P-1 (note the negative number)?  And is -1 higher or lower priority than -2?

The more positive the number, the sooner that tank drains. -1 is higher than -2.

Share this post


Link to post
Share on other sites
  • 0
Just now, DD_bwest said:

tanks with higher numbers will drain before lower ones,  so you could break down your tanks and have them drain bottom to top

eg.  53 for the lowest, 52 for the next, then 51, and finally  50. 

Thanks :D. I am currently completing the Jool 5 Challenge and my Tylo lander, which lacks fuel lines has staging issues due to even fuel draining.

Share this post


Link to post
Share on other sites
  • 0

I kept forgetting whether it went low to high or high to low. I finally remembered by thinking "high priority" = "high numbers" and something that's high priority is something that gets done faster  :)

Share this post


Link to post
Share on other sites
  • 0
On October 26, 2016 at 6:10 PM, Tyko said:

I kept forgetting whether it went low to high or high to low. I finally remembered by thinking "high priority" = "high numbers" and something that's high priority is something that gets done faster  :)

You just saved me much in the way of headaches and time staring at pretty green lines blinking at me in the vab!

Share this post


Link to post
Share on other sites
  • 0
On 10/26/2016 at 6:10 PM, Tyko said:

I kept forgetting whether it went low to high or high to low. I finally remembered by thinking "high priority" = "high numbers" and something that's high priority is something that gets done faster  :)

Also, "Lower is Later".

Share this post


Link to post
Share on other sites
  • 0

Drove me nuts until I realized it works like priorities--priority 1 is higher than priority 16.

My mining/refueling ships have a low number on their own engines and a high number on the fuel they carry to transfer and they have the pumps turned on.  Dock with the target, the fuel moves on it's own, they keep enough to get back down and make some more.

Share this post


Link to post
Share on other sites
  • 0

The numbers go from negative to positive.  So if I have a lower tank I want to drain before an upper one, do I assign the lower tank P1?  Or P-1 (note the negative number)?  And is -1 higher or lower priority than -2?

Share this post


Link to post
Share on other sites
  • 0

There's the base priority, and the user modifier which defaults to 0. Base priority is determined by staging order; tanks that stage away earlier will have a higher base priority and drain first. That is, unless you set a user modifier. The final priority is the sum of base + user modifier. Changing the staging order doesn't change the user modifier, only the base priority.

Share this post


Link to post
Share on other sites
  • 0

Not to be pedantic about terminology, but since this topic causes a lot of confusion, I thought to add my own bit.  Since we're talking about the tank drain sequence, I prefer to avoid using the terms higher and lower to refer to that.  Those terms already have meaning for propellant tanks stacked vertically on a rocket, so a better way to describe matters of fuel flow priority is with the terms earlier and later.  To that end, I think @bewing has exactly the right idea.

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.