<Pinkbeast>
(but er wtf is that asymmetrical booster?)
<Eddi|zuHause>
that's two LF tanks and two SF boosters
<Eddi|zuHause>
the two earlier pictures is CoM at launch and with booster stage depleted
<Pinkbeast>
What's in the rest of the huge fairing?
<Eddi|zuHause>
there's a habitat for my mun base, the rover, and a sample return rocket
<Pinkbeast>
I've got to go outside but what's it look like when it flips?
<Eddi|zuHause>
what do you mean?
<Eddi|zuHause>
near when the booster stage is depleted, i lose control, and then it breaks apart
<Mat2ch>
You should use a longer first stage. Then you will be higher up in the atmosphere, when you stage
<Eddi|zuHause>
this all happens before the first staging would occur
<Eddi|zuHause>
i don't really understand the effects of fairing shape on CoL
<Eddi|zuHause>
do i want it pointier? blunter?
<Mat2ch>
You can look at the changes by enabling CoL and then tilting the rocket in the VAB
<Mat2ch>
the editor assumes that the rocket is flying up all the time (in the SPH it's from the left)
<Eddi|zuHause>
that's a thing i didn't know
<Eddi|zuHause>
so the CoL is widely off-center then
<Eddi|zuHause>
anyway, my idea with the asymmetric boosters was, while the two SF boosters do their job, the main engine draws from the added LF tanks on the side. they both take roughly the same time to deplete, and then staging happens, with the center tank being still mostly full
<Eddi|zuHause>
also, which winglet should i use?
<Eddi|zuHause>
i now use a way oversized AV-R8
<Eddi|zuHause>
that didn't help at all
<Eddi|zuHause>
should i maybe try just going steeper, instead of turning?
<Althego>
i would just swap to 4 or 6 solid boosters and go up until 50 km
<Althego>
there shouldnt be a flip then
<Mat2ch>
I'd really go with a long first stage, maybe boosters to increase the TWR to 1.25 at launch
<Mat2ch>
then do a launch where you stay prograde all the time and only stage above 20-25 km
<Mat2ch>
make only very soft turns on your gravity turn
<darsie>
Eddi|zuHause: If your rocket flips during ascent due to atmospheric drag you can use fins at the bottom to stabilize it.
<darsie>
Ascent is most efficient if you fly shallow, but that conflicts with atmospheric drag. There's a sweet spot.
<darsie>
If your rocket has drag issues you may have to fly up steeper, or redesign the rocket.
<darsie>
Also, don't use a fairing as root part. It may cause high drag.
<darsie>
It's a bug.
<Eddi|zuHause>
no, the root part is the rover's lander can.
<Eddi|zuHause>
i successfully reached orbit by keeping straight
<Eddi|zuHause>
but i feel like i used too much fuel of my later stage
<Eddi|zuHause>
1500 doesn't feel like enough for a mun landing
<Eddi|zuHause>
from LKO
<Mat2ch>
btw: is there a mod for different burn patterns of solid stage boosters?
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<Mat2ch>
the rumors are going wild over KSP2 btw. Some are now expecting that the current version will be soon made into 1.0 to get money from Epic and then there will be only bugfixes...
<Eddi|zuHause>
this was a more efficient launch, 1900 left
<Mat2ch>
:)
<darsie>
Eddi|zuHause: The delta-v map (see topic) says you need 1750 m/s from LKO to land on the Mun.
<darsie>
This should be fairly precise.
<darsie>
Well, landing dv is mushy.
<Eddi|zuHause>
better have some margin on that for landing
<Eddi|zuHause>
something broke my rover wheels, either while inside the fairing or when deploying the fairing
<darsie>
I can just jetpack to orbit from the Mun which is 600 m/s.
<darsie>
It's tricky.
<darsie>
Doing that in reverse is even trickier.
<Eddi|zuHause>
yes, i've done jetpack to orbit
<darsie>
hey, cool :)
<Eddi|zuHause>
but i'm terrible at efficient and precise landings
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<Eddi|zuHause>
which i need when delivering this habitat to the existing science lab
<darsie>
OTOH Kebals are quite resilient during 'landing', so it's not that hard, actually.
<Mat2ch>
land on the head! They are bouncy! ;)
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<Eddi|zuHause>
hm... i got a mun encounter without first circularizing properly
<Eddi|zuHause>
1000m PE might be a tiny bit low :p
<Mat2ch>
hehe
<Mat2ch>
Oh, direct Mun launches are fun
<Mat2ch>
I don't know how to do it anymore, but it was something like "wait until the Mun is 1/4th of this" then you can just go for it
<darsie>
Eddi|zuHause: Like, overshooting your ascent? That's probably suboptimal.
<darsie>
Maybe not terribly bad, though.
<Eddi|zuHause>
darsie: it was just marginally off a prograde burn
<Eddi|zuHause>
and i still got 1200dv for mun orbit and landing
<Pinkbeast>
Eddi|zuHause: I think I'd start by installing FAR
<Pinkbeast>
And try and make as much of the first stage as possible SRBs mounted as low as possible with fins on their bottom ends
<Pinkbeast>
Also I'd try Procedural Fairings for a less ghastly fairing shape (in a FAR world, if it looks wrong it usually doesn't want to fly)
<Pinkbeast>
Mat2ch: I know of at least one SRB burn type mod - dunno the name but it may help to know it exists
<Eddi|zuHause>
Pinkbeast: i have FAR
<Eddi|zuHause>
and now i have two maneuvers planned, 3 minutes apart...
<Pinkbeast>
Oh good! Well, I'd definitely try a less weird looking fairing
<Pinkbeast>
IDK about going 50km straight up, more just try and go prograde all the way up... but also I appreciate this is moot if you're in orbit now
<darsie>
I typically do a gravity turn at 30-100 m/s and when prograde decays to heading I turn on prograde hold.
<Eddi|zuHause>
i did redesign the fairing to be mostly straight
<Pinkbeast>
I like the egg-shaped ones, they're quite pleasing
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<Pinkbeast>
(another way to avoid flipping is just to keep TWR and hence speed down; this is not very cost effective.)
<Eddi|zuHause>
i made it slightly wider as well, because the wheels bumping and clipping against the fairing probably doesn't help anyone
<Pinkbeast>
Hangar is another mod that sparks joy for me
<Eddi|zuHause>
my quick-and-dirty mun encounter maneuver sent me on a weird trajectory where the encounter is after the kerbin AP, so it takes a bit longer to arrive
<Eddi|zuHause>
otherwise i could have finished this before the other maneuver...
<Eddi|zuHause>
unfortunately that means i cannot now roll back to launch when my mun landing attempts show fatal design flaws in the rocket.
<darsie>
mhm, you used a bit more dv to get that trajectory and you'll have to spend that bit more dv again for capture.
<darsie>
I typically make departure/capture burns close to the body for maximum ???? effect.
<Eddi|zuHause>
yes
<Eddi|zuHause>
but i only had a few seconds to plan that maneuver
<Eddi|zuHause>
it's gonna be fine
<darsie>
Oberth
<Eddi|zuHause>
i had a fairly high AP from my first stage which was eyeballing the direction at the last few seconds of burning
<Eddi|zuHause>
so i could have circularized from a higher AP, and waited an entire orbit for the mun maneuver
<Eddi|zuHause>
now i have to run this intercept maneuver and the mun orbit insertion in parallel