Why does my craft wobble and spin out of control? I have SAS on

[Kew]

picture of my ship
https://imgur.com/a/khJu6
the wobbling and spinning happens around 300m/s at the first stage
onion staging

[Kew]

I just solved it by adding a few winglets if anyone is having the same problem

[Knarrwinkel]

Weight at the bottom, wings, no nose cones and other draggy stuff at the top. It is basically the polar opposite of an aerodynamically stable craft.

[RoofCat]

because there is atmosphere on Kerbin. Drag is a huge force at high speeds (closer to MACH1 and above) in low atmosphere.

It not just takes you out of balance, it also wastes tonns of fuel during launch just fighting that air wall.

Rockets must be like arrows. Slim, sharp, heavy nose, winglets at bottom.
For Kerbal gods sake add nose cones everywhere and reconsider where you attach "feathers".

[Kew]

Originally posted by RoofCat:

because there is atmosphere on Kerbin. Drag is a huge force at high speeds (closer to MACH1 and above) in low atmosphere.

It not just takes you out of balance, it also wastes tonns of fuel during launch just fighting that air wall.

Rockets must be like arrows. Slim, sharp, heavy nose, winglets at bottom.
For Kerbal gods sake add nose cones everywhere and reconsider where you attach "feathers".

thank you for the advice. I know that my rocket must look so fkn terrible LOL. Can I know what you refer to as feathers?

[RoofCat]

all wings and winglets, steering surfaces... Those must be at the bottom, tail. Like on ancient arrows.

In case they are at the top, you will have to still add twice as many to the bottom too. Which is just bad.

[Kew]

Originally posted by RoofCat:

all wings and winglets, steering surfaces... Those must be at the bottom, tail. Like on ancient arrows.

In case they are at the top, you will have to still add twice as many to the bottom too. Which is just bad.

Oh thats because each of the wings is actually a probe. I wanted the probes to look cool HAHAHA but I understand what you mean. Thanks !!

[RoofCat]

Originally posted by Tam Honks:

Originally posted by RoofCat:

all wings and winglets, steering surfaces... Those must be at the bottom, tail. Like on ancient arrows.

In case they are at the top, you will have to still add twice as many to the bottom too. Which is just bad.

Oh thats because each of the wings is actually a probe. I wanted the probes to look cool HAHAHA but I understand what you mean. Thanks !!

separate probes? Did you at least balance their Center of Mass in regard to Center of Thrust perfectly so they can actually fly straight in space at all?

[Kew]

Originally posted by RoofCat:

Originally posted by Tam Honks:

Oh thats because each of the wings is actually a probe. I wanted the probes to look cool HAHAHA but I understand what you mean. Thanks !!

separate probes? Did you at least balance their Center of Mass in regard to Center of Thrust perfectly so they can actually fly straight in space at all?

Nope. they flew fine though

[RoofCat]

Reaction wheels and gimbal makes it look so. But will you see 0.1..0.3° persistent shift during those burns on a pixelated NavBall?

Even small differences can shift planned target a lot during long burns if the rocket happens to be in particular rotation. Because of the way SAS is implemented in KSP and then its max force compared to propulsion and mass inertia.
Better keep everything as symmetric as possible and balanced once you go for Jool or really accurate maneuvers.

[Kew]

Originally posted by RoofCat:

Reaction wheels and gimbal makes it look so. But will you see 0.1..0.3° persistent shift during those burns on a pixelated NavBall?

Even small differences can shift planned target a lot during long burns if the rocket happens to be in particular rotation. Because of the way SAS is implemented in KSP and then its max force compared to propulsion and mass inertia.
Better keep everything as symmetric as possible and balanced once you go for Jool or really accurate maneuvers.

♥♥♥♥♥♥♥♥♥ you're good LOL. thanks alot man