egg changed the topic of #principia to: Logs: https://esper.irclog.whitequark.org/principia | <scott_manley> anyone that doubts the wisdom of retrograde bop needs to get the hell out | https://xkcd.com/323/ | <egg> calculating the influence of lamont on Pluto is a bit silly…
<queqiao->
⟨PrinceZola⟩ does principia changes the dynamics of spin stabilization?
<raptop>
Principia correctly implements the Джанибеков effect, anyway
<queqiao->
⟨PrinceZola⟩ it feels like my rocket designs are suffering from a lot of precession even when spin stabilizing, feels weird
<queqiao->
⟨PrinceZola⟩ ⟪raptop⟫ Principia correctly implements the […] ⮪ then how one would go about to spin stabilize their kick stage? how to design it?
<queqiao->
⟨PrinceZola⟩ do i need a deep understanding in analytical mechanics? xP
<raptop>
I don't think so, just make sure to avoid imparting spin on the intermediate axis?
<queqiao->
⟨PrinceZola⟩ what is the intermediate axis?
<queqiao->
⟨PrinceZola⟩ if its the single different from the other axis... then im screwed because thats the one pointing towards the desired angle
<queqiao->
⟨PrinceZola⟩ perhaps having 4 instead of 2 spin motors would remove the intermediate axis?
<queqiao->
⟨test_account⟩ Yes, this will help
<queqiao->
⟨PrinceZola⟩ now its even worse lol
<queqiao->
⟨test_account⟩ Then its not dzhanibekov effect but something else
<queqiao->
⟨test_account⟩ Dzhanibekov is easy to recognize, it flips back and forward (given time)
<queqiao->
⟨PrinceZola⟩ im at around 75km up when i activate the stage, there is like 0.1kPa of dynamic pressure so i really dont think its an aero issue
<queqiao->
⟨test_account⟩ It may be that your spin motors simply have variance which leafs to wobbling
<queqiao->
⟨test_account⟩ * leads
<queqiao->
⟨PrinceZola⟩ probably
<queqiao->
⟨PrinceZola⟩ i will try spinning the whole rocket then maybe its heavier weight will "absorb" the variance or something lol
<queqiao->
⟨test_account⟩ If this is the kick stage, i would suggest to spin the previous stage before detaching the kick stage
<queqiao->
⟨test_account⟩ Yes, exactly
<queqiao->
⟨test_account⟩ This also improves dv of the kick stage
<queqiao->
⟨test_account⟩ Spin motors are horribly heavy for what they do
<queqiao->
⟨PrinceZola⟩ still nope xP
<queqiao->
⟨PrinceZola⟩ i think it is the dzabhenikov effect...
<queqiao->
⟨PrinceZola⟩ like
<queqiao->
⟨PrinceZola⟩ its spin very off axis then it gets kinda centered and then off it goes again