Question about Open Rocket and transitions

SDramstad

Well-Known Member
TRF Supporter
Joined
Jun 26, 2014
Messages
1,065
Reaction score
1,044
Location
Champaign Il
I am playing with a design that has a 2.6 inch nosecone and a long (18 inch) transition out to a 4 inch diameter 4 inch long body tube. What I am seeing in open rocket is the stability of this rocket goes negative with the long transition but positive if I make it a 4 inch body tube instead of the transition. This is counter intuitive to me. The taper should move the CP toward the back not move it forward. Can anyone explain this to me?
 

neil_w

OpenRocketeer
TRF Supporter
Joined
Jul 14, 2015
Messages
14,507
Reaction score
7,993
Location
Northern NJ
Hmm, I just did a quick experiment and wasn't able to reproduce what you're describing, probably because I'm not doing it right. Posting the ORK file would (as always) be great, but also just screenshots of the different configurations would be ideal.
 
Top