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-_> B​utcher. — Building principia from source, wish me luck...
<discord-_> B​utcher. — Needless to say it didn't work.
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<discord-_> e​gg. — @Butcher what failed?
<discord-_> B​utcher. — Foxed now - my VS installation wasn't correctly installed.
<discord-_> B​utcher. — Fixed now - my VS installation wasn't correctly installed. (edited)
<discord-_> B​utcher. — @egg I have some logging for my RCS burn weirdness.
<discord-_> e​gg. — and also you have a build that has no camera spin madness :D
<discord-_> e​gg. — win-win
<discord-_> B​utcher. — I get, thrust=0.00646666628300713 max_thrust=0.0194 Isp=120.9 for each RCS block, the max_thrust and Isp are correct, but the vectored thrust is off.
<discord-_> B​utcher. — These are multi-port RCS blocks, so it seems like it's assuming the thrust vector is not along the port direction or something?
<discord-_> e​gg. — what about the non-RCS engines? iirc you had issues with those too
<discord-_> e​gg. — they should be easier to understand than RCS blocks
<discord-_> B​utcher. — I've not had a chance to check them yet. My current ship only has RCS.
<discord-_> B​utcher. — Hmm.
<discord-_> B​utcher. — ```from transform in engine.thrusterTransforms
<discord-_> B​utcher. — select Math.Max(0,
<discord-_> B​utcher. — Vector3d.Dot(reference_direction,
<discord-_> B​utcher. — -transform.up))).Average()```
<discord-_> B​utcher. — Does that average the thrust transforms?
<discord-_> B​utcher. — Seems like for RCS it should take the maximal value?
<discord-_> e​gg. — hmm
<discord-_> B​utcher. — Or possibly sum them?
<discord-_> e​gg. — I think the thrust is the max it can provide overall, it can't be firing at max thrust through all ports
<discord-_> e​gg. — or maybe it can, I don't know
<discord-_> B​utcher. — Essentially I have one port facing in the reference direction so I should get full thrust.
<discord-_> e​gg. — yeah, this code is definitely fishy
<discord-_> B​utcher. — Yeah, I'm not 100% clear on how the thrust is rated for RCS.
<discord-_> e​gg. — try with your engines, I'd like to understand the simple case first
<discord-_> B​utcher. — My kOS code assumes that the thruster can deliver 100% down any single port.
<discord-_> e​gg. — since you had issues with the engines too
<discord-_> e​gg. — and compare with MJ/KER rather than custom code, ideal/ly
<discord-_> B​utcher. — I'll sort a test case for that this evening./
<discord-_> e​gg. — and compare with MJKER rather than custom code, ideal/ly (edited)
<discord-_> e​gg. — and compare with MJ/KER rather than custom code, ideally (edited)
<discord-_> B​utcher. — KER agrees with me, to some extent.
<discord-_> B​utcher. — Certainly for the engine case.
<discord-_> e​gg. — yeah but let's just have as few moving parts as possible
<discord-_> B​utcher. — Agreed.
<discord-_> B​utcher. — I have similar logging for engines, so I'll report back on them.
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<discord-_> O​ndrikB. — What does "inertially fixed" mean?
<discord-_> B​utcher. — No steering.
<discord-_> B​utcher. — Essentially you're doing a spin stabilised burn or something similar.
<discord-_> O​ndrikB. — ok
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<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2435 commit - https://git.io/JejPe
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2435 commit - https://git.io/JejPv
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2435 commit - https://git.io/JejPf
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2435 commit - https://git.io/JejPJ
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2435 commit - https://git.io/JejPU
<discord-_> B​utcher. — @egg I have an engine burn manoeuvre set up. KER says 74s, Principia says 101.5s
<discord-_> e​gg. — fun
<discord-_> B​utcher. — My engines are reporting 21.28 kN thrust and 231s Isp in principia.
<discord-_> e​gg. — and in MJ/KER?
<discord-_> B​utcher. — The same
<discord-_> B​utcher. — 42.56 kN for two engines, 231s Isp.
<discord-_> e​gg. — OK
<discord-_> e​gg. — so now, where is Principia screwing up
<discord-_> e​gg. — are your engines forward wrt how the ship was built?
<discord-_> B​utcher. — Yes.
<discord-_> B​utcher. — Principia reckons 21.28 kN for each along the thrust vector.
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<_whitenotifier-d13c> [Principia] eggrobin reviewed pull request #2435 commit - https://git.io/Jej1j
<_whitenotifier-d13c> [Principia] eggrobin reviewed pull request #2435 commit - https://git.io/Jej1j
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<discord-_> e​gg. — @Butcher hm, but that's correct then. How are we screwing up then?
<discord-_> e​gg. — @Butcher do we have the correct mass for your ship?
<discord-_> e​gg. — moar traces
<discord-_> B​utcher. — I'll add some more tomorrow.
<discord-_> B​utcher. — Could be mass. Not much else involved that I can think of.
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