Why is my VTOL Flipping Sideways?

[BirdWanderer]

Why is my VTOL flipping like this? I have tried putting a vertical control point on the top, but it changed nothing. Help?

[Vanamonde]

Engines and mass balanced? Got pics? 

[king of nowhere]

why newcomers always think we can troubleshoot blind?

there are a dozen things that could be going wrong, from construction to staging to piloting. we need informations to try and figure out your problem. posting pics of your ship is the first step, but any additional detail (thrust, mass, symmetry, etc) or description (when exactly does it flip, how it flips, etc) is also potentially useful

[Vanamonde]

New forum members might have difficulty figuring out how to post screenshots. It's not obvious. 

[steuben]

VTOLs are hard with stock tools. Something like KER will help you balance out the torques.

[BirdWanderer]

Here are some screenshots.

 

[Vanamonde]

R-click on the engines and make sure they are both generating thrust. I haven't tried this for a long time but as I recall, there might not be enough intake air for them both. 

[Snark]

28 minutes ago, BirdWanderer said:

Here are some screenshots.

Is it possible you're not getting enough intake air to run both the engines?

I've noticed that when a multi-engine jet plane isn't getting enough intake air, the symptom is typically not that all the engines uniformly start losing thrust.  Rather, it ends up starving one engine before the other-- e.g. one engine is firing at full power but the other is cutting in and out.

So you end up with differential thrust and it can flip you around.

If that's what's happening... bear in mind that different intakes are sensitive to relative airspeed along their axis in different ways.  Those intakes you've got atop the wings really want air to be flowing into them, which they won't be getting a lot of in this orientation.  Whereas, IIRC, some other intake types, like the engine "precooler", may be less sensitive to airflow velocity and might work well in this scenario.

I'd suggest some experimenting to see if adding other intake types might help.

[BirdWanderer]

Using intakes with better static suction causes the aircraft to flip later, and less violently. The Engine Nacelle I used had over double the air intake but the flip still occurred.

 

[Vanamonde]

Try adding some more intakes? 

[BirdWanderer]

I'll do that

 

 

[BirdWanderer]

It's working now! Thanks for the help

[Vanamonde]

VTOLs are very tricky. Congrats on getting yours to work.