Drag Co-efficient of side of rocket

[Matt]

hey guys

anyone know a drag co-efficient for the side of a rocket, a generic shaped rocket will be sufficient


EDIT: i was going to use an approximation of a cylinder in turbulent flow (20ms wind wit a diameter of 0.125m you get a reynold number of ~650,000 (turbulent)) which according to a text book of mine is 0.3, so would 0.35 suffice as decent approximation to account for fins?


Cheers
Matt

 

[rocket72175]

Hmm, I think the Cd of an infinite cylinder in cross-flow is around 1.2. Not sure about the end effects of a finite length tube with fins attached.

Yes. Cd=1.17. See Hoerner's 2D shapes in this link (Re = 1E4 to 1E6)

https://www.aerospaceweb.org/question/aerodynamics/q0231.shtml