Centre of Mass Problems

[gusty kettle]

Hello, could anyone please help me with changing my rocket a little.
I have centre of mass problems but I’m not sure what to add to fix them.
Thanks!

[inland echo]

can you send a screenshot of your rocket with the center of mass and center of thrust overlays on

[gusty kettle]

Will do

Give me a sec

[gusty kettle]

@inland echo

[inland echo]

umm

and you just launch it like thiss?

add a fairing

the front of your rocket has a ton of drag

also remove the top most find

find

fins

or just move them near the bottom

[gusty kettle]

Yes, I don’t have a fairing xD

The main problem seems to be when I detach the two side boosters, and lean it too far.

I think it’s because the weight is too far down

[gusty kettle]

I can remove the radiators and stuff

[inland echo]

yes

[gusty kettle]

I was only adding them to try and shift mass higher

[inland echo]

its drag

[gusty kettle]

Why would that tip over?

[inland echo]

add a fairing

[gusty kettle]

I don’t have fairings unlocked

[inland echo]

if you slightly tip over

you have wayy more drag on the top than on the bottom

so it flips

put a lot of fins on the bottom

like idk 4x av r8

[gusty kettle]

Ahh ok

[inland echo]

and try to make the top as aerodynamic as possible

[gusty kettle]

Where are fairings unlocked?

[inland echo]

idk but its not that late

check your tech tree

[gusty kettle]

I’m struggling to get like 15 science right now xD.
First one is at 300

[inland echo]

if you unlock fairings dont worry about center of mass

remove the radiators and anything unnecessary

i would remove all rcs

like mono propellant and

[gusty kettle]

Batteries?

[inland echo]

rcs ports

[inland echo]

where are you planning to go with this

[gusty kettle]

Just low moon orbit

And then back

[inland echo]

ok just put like 2 batteries and 2 spl 1x6 solar panels

and remove the fins near the top

[gusty kettle]

I don’t have solar panels either xD

[inland echo]

not even just the single panels?

2x z100 will be enough

[gusty kettle]

No, they’re a little expensive

[inland echo]

like money or like science

[gusty kettle]

Science

I’m doing science mode atm

[inland echo]

oh

ok

yeah

[gusty kettle]

is this better?

[inland echo]

ok you have eva unlocked right?

you can do evas?

[gusty kettle]

Yeah

[inland echo]

ok

so you should redesign basically the whole rocket ngl

[gusty kettle]

Oh damn that’s sad.
I thought it was cool

What’s the problem with it?

[inland echo]

its just weird

it widens very quick

[gusty kettle]

Alright fair enough xD

[inland echo]

i dont even think you need 2.5 meter parts

so

you should put

your capsule + parachutes + heatshield

then add a decoupler

then put your science stuff and your orbiter engine

[gusty kettle]

And that’s it?

[inland echo]

no

then another decoupler

and your main booster

right now your rocket comes down with everything afaict

you should only bring down the capsule with a heat shield

can you send a screenshot of your tech tree

[gusty kettle]

Sure

[inland echo]

what do those 2 nodes in level 4 give you

[gusty kettle]

RCS stuff and advanced fuel systems

[inland echo]

nono

its aerodynamics and stability

those ones

[gusty kettle]

Flight control and stability?

There isn’t one called aerodynamic

[inland echo]

yeah

[gusty kettle]

Yeah I have both of them

[gusty kettle]

Also, if my science stuff is on my final rocket, how do I get it back to kerbin?

[inland echo]

you dont

if you go on eva

you can collect data

meaning you bring the science back into the capsule

it also means you can run your barometer and thermometer more than once

but mystery goo and science jr requires a scientist on eva to reset

[gusty kettle]

ah cool

[topaz pasture]

So ideally you want the centre of mass to be higher than the centre of pressure

This means long, thin rockets are generally better than short, girthy rockets

What id do here is ditch the 2.5 m parts, make the booster stage a longer 1.25 m state and add more of the Soyuz style boosters, maybe four

[gusty kettle]

Alright cool thanks.
I’ll get back to you after I’ve made one like this

[gusty kettle]

@topaz pasture I’m not sure I have any of those parts

Also how do you see the length of them?

[topaz pasture]

you can just add more of the smaller parts if you don't have the long ones