00:44 <discord-> B​utcher. — Incidentally, I reckon spool times as 0.9s for pressure fed and 2.4s for pumped.

00:45 <discord-> S​tonesmile. — is 2.4 s a general guess, or is it true for most engines?

00:52 <discord-> M​arsh. — Sounds about right to me. Well, the agenda sure *feels* like it’s more than 2.4. But even if it’s not perfect, just using a best guess offset is much better than none at all

00:52 <discord-> M​arsh. — Sounds about right to me. Well, the agena sure *feels* like it’s more than 2.4. But even if it’s not perfect, just using a best guess offset is much better than none at all (edited)

00:52 <discord-> S​tonesmile. — Yeah, 2 - 2.5 seems about right, not sure if it's the same on most engines

01:34 <discord-> l​pg. — I've been using 1.5 pressurefed, 2.5 pump-fed, but it's hardly scientific

01:34 <discord-> l​pg. — the actual formula is based on thrust and mass of the engine, iirc

03:06 <discord-> S​umguy. — pressure-fed spool up time? shouldn't it be really fast, as there's no turbopump to spin up?

03:06 <discord-> S​umguy. — pressure-fed spool time? shouldn't it be really fast, as there's no turbopump to spin up? (edited)

03:06 <discord-> S​umguy. — you're just opening valves

03:18 <discord-> M​arsh. — Depends on how large these valves are 🙂 And it’s probably mechanically unsafe to go from 0 to 100 instantly even if the engine will allow it. 1 second sounds pretty readable for a large pressure fed spool up time

04:02 <discord-> l​pg. — there was some discussion on that not long ago. I think Kirk was of the opinion that pressure-feds _should_ get a faster time

04:06 <discord-> l​pg. — https://discord.com/channels/319857228905447436/663102368887472156/782454974432804865

05:39 <discord-> P​aculino (ŝi/ri/she/they). — I thought it was twice that, but that is just the difference in ingame time and real.

09:30 <discord-> B​utcher. — Empirically tested. It's the lead time such that by the time the engine is fully spooled it will have burned the correct amount of fuel as though it wad instantaneously started at full thrust at the point at which the manoeuvre started.

09:31 <discord-> B​utcher. — It's spot on to within 0.02s for the RL10A.

09:31 <discord-> B​utcher. — Also I don't think thrust and mass make any difference from what I recall or the RF code.

09:32 <discord-> B​utcher. — Also I don't think thrust and mass make any difference from what I recall of the RF code. (edited)

09:32 <discord-> B​utcher. — Empirically tested. It's the lead time such that by the time the engine is fully spooled it will have burned the correct amount of fuel as though it was instantaneously started at full thrust at the point at which the manoeuvre started. (edited)

09:34 <discord-> B​utcher. — It's very accurate for the AJ10-137, I've had lunar return burns that got my reentry periapsis within a couple of km without rcs.

09:36 <discord-> B​utcher. — Fwiw, F-1s spool in under 4 seconds as well and they are huge compared to the RL10A.

11:25 <discord-> (​experimentalshells?). — https://gfycat.com/bigtotaliberianchiffchaff-ksp-rss-rp1

11:25 <discord-> (​experimentalshells?). — 🤦

11:30 <discord-> D​amien (it/that). — F

11:31 <discord-> D​amien (it/that). — Intermediate axis theorem strikes again

11:31 <discord-> (​experimentalshells?). — Джанибеков claims yet another victim

11:32 <discord-> D​amien (it/that). — I typed that out in English before changing it to IAT because I'm too lazy to spellcheck it

12:35 <discord-> B​utcher. — @egg Is it a known issue that my trajectory doesn't change if I have a target selected and I'm in *CI frame?

12:36 <discord-> B​utcher. — @egg Is it a known issue that my trajectory doesn't update during a burn if I have a target selected and I'm in *CI frame? (edited)

12:36 <discord-> B​utcher. — Also similar issues with flight plans not updating.

14:22 <discord-> l​pg. — <https://github.com/NathanKell/ModularFuelSystem/blob/bd6122a1a193deafd133960a6309024bb48b2e4a/Source/Engines/ModuleEnginesRF.cs#L219>

14:23 <discord-> e​gg. — @Butcher your trajectory as in your prediction?

14:23 <discord-> e​gg. — that seems very odd

14:24 <discord-> e​gg. — is it not updating at all, or merely doing so at a reduced rate

15:44 <discord-> B​utcher. — In some cases I have seen it at a very reduced rate, in others not at all.

17:03 <discord-> C​aravansofrockets. — I think I asked this question before here, but what are these diagrams of rendezvous?

17:03 <discord-> C​aravansofrockets. — https://cdn.discordapp.com/attachments/480397772248580098/792437446725337119/ccfdhb5x-1337308497.png

17:03 <discord-> C​aravansofrockets. — https://cdn.discordapp.com/attachments/480397772248580098/792437551629205525/profile_miles.png

17:04 <discord-> C​aravansofrockets. — I am pretty interested in orbital maneuvering and rendezvous operations, resources for me to learn all this will be helpful

17:04 <discord-> e​gg. — the same thing you would see in Principia but unrolled

17:04 <discord-> C​aravansofrockets. — ( I am a freshman in high school)

17:05 <discord-> e​gg. — Someday I will understand anglo-saxon class names but today is not that day

17:05 <discord-> C​aravansofrockets. — 9th standard

17:05 <discord-> C​aravansofrockets. — sorry lol

17:07 <discord-> e​gg. — that also confuses me but apparently it maps to what I would call 3e

17:08 <discord-> C​aravansofrockets. — ( I am a freshman (9th standard) in high school) (edited)

17:09 <discord-> e​gg. — (french grade names are perfectly sensible of course: preparatory course, elementary course 1, elementary course 2, middle course 1, middle course 2, 6th, 5th, 4th, 3rd, 2nd, 1st, terminal 🙃)

17:10 <discord-> e​gg. — So, back to those diagrams, you have altitude vertically, along-track horizontally, and the station does not move

17:10 <discord-> C​aravansofrockets. — so like how does rendezvous operations irl differ from stock ksp

17:10 <discord-> e​gg. — this is sort of what you have with target LVLH in Principia though

17:10 <discord-> C​aravansofrockets. — so like each bump is an orbit?

17:10 <discord-> C​aravansofrockets. — so like how does rendezvous operations irl differ from stock ksp? (edited)

17:11 <discord-> e​gg. — each bump is a closest approach, so basically yes

17:11 <discord-> e​gg. — if you have done rendez-vous with Principia this should be familiar

17:12 <discord-> C​aravansofrockets. — My laptop can't handle it, and I am still a noob at rss/ro, I previously saw it during dm-2 mission, just curious

17:12 <discord-> C​aravansofrockets. — Do they do a hohmann transfer like in stock?

17:12 <discord-> C​aravansofrockets. — Do they do a hohmann transfer at the correct angle like in stock? (edited)

17:13 <discord-> e​gg. — you could try docking with Principia+stock, without the added difficulty of RSS/RO and whatnot

17:13 <discord-> e​gg. — (for the purposes of getting acquainted with what rendez-vous look like in various reference frames)

17:13 <discord-> C​aravansofrockets. — okay, thanks!

17:14 <discord-> e​gg. — see also https://github.com/mockingbirdnest/Principia/wiki/A-guide-to-performing-low-orbit-rendezvous (which could use some pictures but may still be useful)

17:46 <discord-> B​utcher. — I normally come smashing in about a relative velocity of about 60 m/s and crash brake on approach. 😆

20:35 <discord-> F​alcon. — Question, is it a bug that when a vessel is targetted, your orbital trajectory lines dont change during a maneuver at all? I have had several instances where i would initiate a burn and the burn would not register on the map mode until i either quicksaved and quickloaded back in, or unset the target and then reset it as my targetr

20:35 <discord-> F​alcon. — Question, is it a bug that when a vessel is targetted, your orbital trajectory lines dont change during a maneuver at all? I have had several instances where i would initiate a burn and the burn would not register on the map mode until i either quicksaved and quickloaded back in, or unset the target and then reset it as my target (edited)

20:37 <discord-> l​pg. — Butcher was asking the same thing earlier today

20:38 <discord-> F​alcon. — ah yes i see, well then it seems like a bug to me... it also when it does track the burn/active maneuver, seems to be rather choppy in how quickly it updates, moreso than usual

22:20 <discord-> e​gg. — hm, maybe the code that kills the prognosticators is a bit too eager…

22:30 <discord-> e​gg. — yeah that is probably it

22:31 <discord-> e​gg. — @Butcher please open an issue so I don't forget

23:14 <egg|laptop|egg> raptop: what about feathers

23:17 <raptop> feathers are of limited value in an environment where you're tracking Δv

23:21 <discord-> P​aculino (ŝi/ri/she/they). — Thank you, egg