raptop changed the topic of #principia to: READ THE FAQ: http://goo.gl/gMZF9H; The current version is Fréchet. We currently target 1.5.1, 1.6.1, and 1.7.x. <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly… | <egg> also 4e16 m * 2^-52 is uncomfortably large
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<discord-_>
lpg. — tiny feature request: in flight planning, a bit more precision on the burn duration (just one more digit)
<discord-_>
egg. — @lpg how precise is it right now (I forget), and how precise can you really be when timing by hand?
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<discord-_>
Butcher. — Even with automated burns you're limited to +/- 0.02s roughly.
<discord-_>
Butcher. — I don't even use timing for my kOS controlled burns, I just track the amount of fuel burned.
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<_whitenotifier-d13c>
[Principia] tinygrox forked the repository - https://git.io/Jvnqs
<discord-_>
lpg. — it's currently tenths of a second. by hand, that's more than enough. with krpc (or kOS), it's not quite enough
<discord-_>
lpg. — really all I want is to know if when 10.1s is actually 10.18 and I should be going for 10.2 rather than 10.1
<discord-_>
Butcher. — Pretty sure it's round to nearest not truncated, but egg may correct me there.
<egg|cell|egg>
Lpg: the thing is, if you have too much precision tis easy to plan that which cannot be done; we don't know about thrust curves and the like, so you will need a TCM if you near those precisions
<discord-_>
Butcher. — TCM?
<discord-_>
Butcher. — Also, having checked the docs, it's round to nearest, so 10.18 would be 10.2, as would 10.15
<egg|cell|egg>
Trajectory Correction Manœuvre
<discord-_>
lpg. — same difference. I'd like to know if the number I'm seeing is more likely to lead to an undershoot or an overshoot
<discord-_>
Butcher. — Given the engines have thrust variance, you could easily under or overshoot in the opposite direction to the suggested direction just from that.
<discord-_>
Butcher. — This is why I track fuel not time.
<discord-_>
Butcher. — Also if you're using kos or krpc you can calculate the duration from the delta v easily enough.
<discord-_>
Butcher. — Which should give you more precision.
<discord-_>
lpg. — easily enough, certainly. easier than s/%.1f/%.2f/, not so much
<discord-_>
lpg. — we're already sunk more effort into discussing it than it was worth 🙂
<discord-_>
RurouniDonut. — How well does KOS handle Principia burns?
<discord-_>
Butcher. — OK, except you can't get the duration from the node.
<discord-_>
Butcher. — Although, the node tends to vanish the instant the duration is over, so you could use that for timing.
<discord-_>
RurouniDonut. — More accurate then doing it manually?
<discord-_>
Butcher. — Hmm, I'm not sure.
<discord-_>
Butcher. — I wouldn't rely on it.
<discord-_>
Butcher. — As mentioned, I use deltaV from the node for timing.
<discord-_>
RurouniDonut. — Gotcha
<discord-_>
RurouniDonut. — Btw, how much does attitude control affect a burn?
<discord-_>
RurouniDonut. — For example if you use rcs to orient yourself for the burn, can that have a large affect on a burn?
<discord-_>
Butcher. — It has an effect, how much depends on the burn.
<discord-_>
RurouniDonut. — I think it made have made my attempt to get to Vesta go way off 🙂
<discord-_>
Butcher. — I keep thinking I should set up a script to do small TCM burns without orientation by just thrusting in the correct direction with RCS.
<discord-_>
RurouniDonut. — *may have made
<discord-_>
Butcher. — I've had a few tens of km delta in my closest approach on a TLI correction.
<discord-_>
Butcher. — If you're doing a long range burn it could easily throw it off.
<discord-_>
Butcher. — This reminds me, I should get my RCS additions for kOS into a PR.
<discord-_>
RurouniDonut. — I have rcs on my transfer stage for small correction burns and I let the probe do the rest.
<discord-_>
RurouniDonut. — Rcs additions?
<discord-_>
lpg. — 'node disappears' is what I've been using with krpc, works pretty well so long as the burn actually starts on time
<discord-_>
lpg. — (read: if I get an ignition failure and need to retry, I'll end up with a short burn)
<discord-_>
Butcher. — @RurouniDonut I have some code which adds `list rcs` and some suffixes for rcs parts to kOS.
<discord-_>
Butcher. — So you can get various stats such as thrust, isp, thrust vectors, etc. from them.
<discord-_>
RurouniDonut. — Oh damn
<discord-_>
RurouniDonut. — Nicee
<discord-_>
Butcher. — Because I was annoyed that I couldn't even reliably get the thrust for my RCS.
<discord-_>
RurouniDonut. — Yeah, it can be annoying when the node disappears if I put mechjeb smart a.s.s to point to the node, one the node disappears it can go crazy