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authornatronics <natronics@web>2010-07-11 20:05:13 (GMT)
committer Portland State Aerospace Society <psas@psas.pdx.edu>2010-07-11 20:05:13 (GMT)
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@@ -154,4 +154,11 @@ Careful viewing of the on board camera footage shows the fins fluttering for abo
The above image shows two nearby frames from the on board camera with the right fin highlighted. In frame 31535 the fin is painted red and in 31537, blue. On the right the two images have been stacked and the fin highlights compared. The fin appears to undergo a flutter with an amplitude of about 4&deg;s.
#### Conclusion
-In general fin flutter is not a good thing. Oscillations can exceed material shear strength and break off fins resulting in catastrophically unstable flight. For flights any faster than Mach 1 we should reconsider our fin material and attachment.
+
+In general fin flutter is not a good thing. Oscillations can exceed material shear strength and break off fins resulting in catastrophically unstable flight. We are probably fine, but stiffening the fins won't hurt.
+
+### Roll Control
+
+The [[roll control|rollcontrol]] was only a partial success. The mechanical and software systems appeared to work as designed. However we appeared to experience a "control reversal" where fins placed in the counter clockwise arrangement caused the rocket to rotate in the clockwise direction and visa versa. The cause of this problem is aerodynamic in nature and is under investigation.
+
+ - [[Roll Control Failure Discussion Page|controlreversal]]