(FIXED) Rotor assembly shaking craft

[FTLparachute]

Pretty simple - rotors on this craft shake when active, causing whole rocket to become uncontrollable. If any ideas, pls tell me.

[DennisB]

I assume, the blades were only deployed in the atmosphere.

I had also trouble with the helicopter blades, as I experimented with a quadrocopter lifter. The first issue was flexing, but that's not the issue with your construction. Try to watch the aero forces at testing (F12), maybe you can see the problem earlier, like the lift forces start to oscillate more and more. The reason could be too high rpm paired with too high propeller angle. Try to adjust the angle during the flight, to get better lift, and try to avoid too high rpm. Another idea, I reduced the number of blades per propeller, because I think, I had much less trouble  with 6 and 4 blades than with 8.

[FTLparachute]

On 1/16/2025 at 5:56 AM, DennisB said:

I assume, the blades were only deployed in the atmosphere.

I had also trouble with the helicopter blades, as I experimented with a quadrocopter lifter. The first issue was flexing, but that's not the issue with your construction. Try to watch the aero forces at testing (F12), maybe you can see the problem earlier, like the lift forces start to oscillate more and more. The reason could be too high rpm paired with too high propeller angle. Try to adjust the angle during the flight, to get better lift, and try to avoid too high rpm. Another idea, I reduced the number of blades per propeller, because I think, I had much less trouble  with 6 and 4 blades than with 8.

Thanks.

 

I have now solved this problem, by just scrapping the craft and building a new one. Turns out the main problem is the S-blades really hate thick atmospheres.

(pictures of me having solved problem)

Spoiler