Don't replace them with anything you don't need fin control that high up on the rocket, and it won't be effective anyway, because they're too close to the centre of mass to have much leverage and be effective. I strongly recommend getting rid of the Delta-Deluxe winglets. You appear to have two types: AV-R8 winglets on your Twin Boar boosters, and Delta-Deluxe winglets high up on the main body of the rocket. However, part of the issue with your fins is in your choice of fin. I don't understand how a few bits sticking out would cause a problem that can't be solved with the SAS modules, fins and RCS rockets. I've put cones at the top and at the first stage fuel tanks but it makes barely any difference. and 200 m/s), and with a low drag / high TWR rocket I tilt over more and lock to prograde earlier (e.g. With at high drag / low TWR rocket I tilt over less and/or lock to prograde later (e.g. How much I tilt over exactly and when exactly I lock to prograde depends on the rocket. 150 m/s I lock SAS to prograde, and keep that until I'm in orbit. I usually first go straight up, at 30 m/s I tilt over ca. Thus you can usually keep it steady with the engine gimbaling alone. That way the "wind" is coming from straight on just along the axis of the rocket, thus minimizing the torque it applies to your rocket. I don't know how you launch, but changing that may also help: a real gravity turn means that you tilt the rocket rather early while you are still slow, and then follow the prograde vector (in surface mode) for most of the launch. (The the CoM indicator in the VAB/ SPH is good, but the center-of-lift indicator (or "Aerodynamic Overlay") is a bit misleading: it only shows the center of "lift" but there is also "drag" working on your craft which can mess up the aerodynamic stability of your craft.) Also change the fuel levels in the tanks, to see how the CoM moves when fuel is burned. Use the display of the CoM in the VAB (or SPH) to check where the CoM is. If you want to use fins to keep the rocket straight, then put them at the bottom of the rocket. Place the fairing base-plate under the decoupler that decouples your payload from the rocket (so that the fairing base doesn't stick to the payload after decoupling) and then build up the fairing around your payload.Ī smaller issue is that I think that many of your fins may be above the center-of-mass ( CoM) and thus increase the rocket's tendency to flip. Well, the single biggest issue is that the payload (your Mun base) is supposed to go inside the fairing, or in other words: the fairing is supposed to go around the payload not on top of the payload.
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