Duna launch

[Lohan2008]

My Duna ship flips at gravity turn despite having 2 gyros and tail fins, Has anyone got an image of their ship (career mode)?

Edited May 3, 2015 by Lohan2008

[rhadamant]

That was mine, 1.02

Edited May 3, 2015 by Claw
pic link

[juanml82]

If your ship wobbles (hence the girders with struts at the middle, I guess) use the Kerbal Joints reinforcement mod. That way you won't need stuff protuding in the middle of the rocket.

Second, use an aerodynamic profile. You have girders and monoprop tanks extruding in the middle, the top of the tanks feeding the mainsails in your first stage lacks cones, the top shouldn't behave aerodynamically (if the aero model is good, "air" should be concentrating between the material labs) - put a fairing there. Although, why send four labs? Send one with a scientist and reset them after collecting the data.

Finally, I believe the orientation of the tail fins matter. If they aren't parallel and/or perpendicular to the ground (assuming level flight, which isn't the case), I would think the changes in direction they'll produce will be sideways. Imagine a plane with the wings like an X-fighter, that should give you the idea (of what shouldn't work). You have the Kickback rockets in the middle, I suggest you rearrange them while keeping symmetry so you can put four tail fins right where the rockets are right now. And use fairings or put the monoprop tanks in a service module. You also have four monoprop tanks which get discarded during the ascend. I'm not sure there is too much point in having them there. As 0.90, monoprop didn't do much in the atmosphere. Vernors are useful for that part instead. Now, with air being thinner (I think) above 20,000, it's possible monoprop is indeed useful at high altitudes. I'm using it, but mostly as a last resort when my ships don't reenter at a proper angle and I didn't put vernors on them.

Also, do you have enough dV in your final stage?

[Eric S]

What's the TWR at launch and what ascent profile are you trying to follow? That's a rather draggy payload you've got on top, but it should be possible. Definitely won't work with the "up 10km then pitch 45 degrees profile", though, or any other profile where you're pitching by more than a few degrees at a time.

[Capt. Hunt]

yeah, I agree with juan, you need to make it more aerodynamic. That design might have worked before 1.0, but with the new aerodynamics model, you need to use lots of fairings and nosecones.

[Blu_C]

Another comment here:

The load at the top of your rocket isn't very aerodynamic at all. You may want to consider putting a Fairing around it or redesigning it. This will make it less likely to catch the airflow when you pick up speed.

[Lohan2008]

Lowering the outside tanks worked, yes I know I should redesign (the) payload.