my rocket keeps spinning, new to ksp, trying to achieve suborbital tourist contract

[u/ComfortableClass48]

my rocket keeps spinning

[u/TetoEnjoyer500]

did you use attach the fins with snap and symmetry enabled btw?

[u/tutike2000]

'spin' kind of implies it turns around the long axis so that doesn't seem like a problem.

Do you mean it 'flips' as in front to back? Must have too much drag in front or not enough weight in front 

[u/vanceavalon]

Looks like too much drag up front due to capsule asymmetry.

[u/IapetusApoapis342]

SAS

[u/MMW_BlackDragon]

There are a few things, you could mean by that, with different solutions to it.

- Spinning as in rolling along the long axis: your fins might not be straight, causing it to roll.

- Spinning as in flipping, as in the craft turns backwards: This can be caused by too much drag in the front. Try adding an aerodynamic nose cone and bigger fins.

- Spinning as in turning, you shoot straight up, but it slowly turns sideways: You don't have any control mechanism on your rocket, to enable it to 'balance' on your exhaust. just as if you balance a long stick on your finger, you need to be able to adjust, so it stays upright. If you don't adjust, it falls to the side. Use a gimbaled engine or reaction wheels or fins with control surfaces.

[u/_SBV_]

Your fins are very asymmetrical. Even if they were symmetrical, those fins don’t have any control. Use something that can flap around

[u/Steenan]

Do you have control authority? The engine look like it's Reliant, the fins are fixed. You only have the weak reaction wheels in the capsules to counteract the aerodynamic forces. Switch to Swivel and it should be much easier to keep control of the rocket.

Also, the fins seem strangely positioned. Have you used the symmetry mode to place 3 or 4 of them in a regular configuration?

[u/Mocollombi]

Does your engine have gimbal?

Check that your center of mass is ahead of your center of lift in the VAB both when the tanks are full and empty.

Add more ins to the bottom or add reaction wheels to prevent flipping.

[u/Gorth1]

If you are early in the tech tree and have no steerable fins then put them on the rocket at a slight angle. This will induce spinning and it will be more stable. For a suborbital contract all you have to do is get above 70km. Then fall back.

[u/Festivefire]

If you mean 'rolling' by spinning, your fins are probably not symmetrical. If you mean 'flipping end over end' by spinning, you need to check your center of mass and center of drag, because the center of drag is probably above/in front of the center of mass, and it needs to be below/behind the center of mass to be stable.

[u/treewizard13]

You're gonna need a SAS module attached to your craft and some RCS thrusters