 3 versus 4 fins on maneuvering rockets / missiles.
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Patrick
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Mon Oct 07 2019, 10:02PM
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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
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Is there a reason 4 fins seem to be more common than 3 fins on missiles and controlled rockets ?
Obviously there's the surface area restoring force difference in surface area (3 vs 4) in just a ballistic non-maneuvering child's rocket.
But is there a stability advantage or is it just a stowage-volume issue before its thrown at the enemy.
The NASA X-31 test program included the conclusions that 3 vs 4 thrust paddles seem to make little difference.
Thrust vectored aided Rockwell-MBB X-31 
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2Spoons
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Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
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Probably just easier to control - 2 fins for pitch and 2 for yaw
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Plasma
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Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
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Center of pressure, its for stable flight, will add more later
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