Description

This article is from the Model Rockets FAQ, by Wolfram von Kiparski with numerous contributions by others.

6.17 How can I build a rocket with less wind resistance?

From: John DeMar (smdemar@mailbox.syr.edu)

The best thing you can do is to NOT use launch lugs. Use a
launch tower instead. A polished, smooth finish makes a big
difference too. If the design allows, use a boattail and make
sure all transitions are smooth (from nosecones/payload sections,
etc.). Fin shape is a minor effect if they are relatively thin,
otherwise make sure the edges are at least rounded.

Here are some numbers for comparison:

         Standard finish, no transitions, with lug:    Cd = 0.88
         Standard finish, no lug:                           0.68
         Polished finish, no lug:                           0.61
         Standard finish, no lug, 2:1 boattail:             0.52

 

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