Rocsim & Fur

[kramer714]

Strange question, my kid is building a rocket from paint rollers. He simmed the thickness, weight and Cg of the pieces, but the drag is going to be waaay different than a un finished tube.

Any ideas on how to tweak the Cd of a paint roller in Rocsim? Any idea what the Cd would be ?

[MarkII]

I don't know about the Cd, but here's (http://www.rocketreviews.com/reviews/all/weather.shtml) a description of a similar project.

MK

[cjl]

Realistically, rocksim won't work for that. You'll probably get a pretty good estimate of Cp, but Cd will be way, way off. Flight testing is probably the best bet (and definitely try to err on the short side, at least at first).