TheKosmonaut changed the topic of #KSPOfficial to: Kerbal Space Program official channel | KSP 1.⑨.1, NaN is doing | Rules: tinyurl.com/KSP-Rules | "modcall" to call ops | Δ🅅 maps: https://i.imgur.com/CHVnEeE.pnghttps://i.imgur.com/gBoLsSt.png | Type "chanlog" for logs | 2020 rover is Perseverance | Practice social distancing, join IRC TODAY!
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<Judge_Dedd>
I've decided to actually use a Dv map for the first time, and I can't work out how to read it. For example, how do I calculate the Dv budget needed for a return from the surface of Mun?
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<Althego>
add the numbers as you move towards your goal
<Judge_Dedd>
Althego, but that means that I need 580+310+860 m/s from Mun to Kerbin
<Althego>
no
<Judge_Dedd>
Everyone always says 1000 is plenty
<Althego>
because there is an arrow
<Althego>
showing aerobreak possible
<Althego>
then you dont need to add those
<Judge_Dedd>
Oh right, aerobraking
<Althego>
but that is your choice, you can and sometimes have to break by fuel, say without heatshields
<Judge_Dedd>
Good point, thanks. So the numbers read both ways in the map
<Althego>
gravity is a conservative force field in clasical mechanics
<Althego>
direction does not matter
<Judge_Dedd>
So, conversely, to get from LKO to Mun orbit would be 1170
<Judge_Dedd>
Then 580 to land
<Althego>
sounds about right
<Judge_Dedd>
Thanks
<Althego>
but in practice you can go with 300 or less
<Althego>
because of aero
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<Judge_Dedd>
Aero on Mun?
<Althego>
ah i meant from mun to kerbin
<Judge_Dedd>
:)
<Althego>
also remember that landing usually takes more
<Althego>
because you never land on a perfect trajectory
<Althego>
except if mechjeb or something similar is doing it for you
<Judge_Dedd>
True, and I an playing with no reverts, so I'll want an extra margin
<packbart>
my rough figures are 900+300 from LKO to Mun, 800 to land, 600 to get back up and 300 to get back to Kerbin
<packbart>
so just about ~3000m/s
<Judge_Dedd>
Looks about right
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<Judge_Dedd>
Thanks for the help guys
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<JVFoxy>
ooof
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<Judge_Dedd>
Hmm... does anyone know a way to make a faring larger than the engine it is attached to?
<Althego>
you mean the auto fairing?
<Judge_Dedd>
Yeah
<Althego>
no, that is fixed
<Althego>
but you can turn it off and use your own interstage fairing
<Judge_Dedd>
I have a small engine attached to a bigger tank, so I want to interstage faring to match the size
<Judge_Dedd>
of the tank
<packbart>
I often use a payload fairing for that
<Althego>
yes, that
<Althego>
you can shape that to your liking
<Judge_Dedd>
I haven't unlocked it yet
<Althego>
then add a converter part
<Althego>
but i never use those, they add mass :)
<Judge_Dedd>
Converter part? You mean an adapter?
<packbart>
I've read of people using the hollow tubes as interstage fairings
<Althego>
that
<Judge_Dedd>
Hrrm. I can't see how an adapter would work
<Althego>
would decrease the diameter at the end of the tank to the size of your engine
<Judge_Dedd>
Oh right.
<Judge_Dedd>
Well... I wanted to make the rocket gradually get fatter towards the bottom, but I suppose bulgy is preferable to downright odd
<Judge_Dedd>
Now I have to find another way of fitting the landing legs...
<Althego>
where we are going we dont need landing legs
<Althego>
these are not the landing legs you are looking for
<packbart>
don't hide your landing legs. they don't have that much drag in the atmosphere, anyway
<Judge_Dedd>
Hehe
<Judge_Dedd>
I'm not trying to hide them, I'm just trying to fit them. The adapter is sloped inwards
<Judge_Dedd>
But I think the legs can stretch to the ground from the part above, just about
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<kubi>
soft landing is overrated
<Judge_Dedd>
Well, not that you say that, I only really need that engine for landing...