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US 6,168,111 AGranted
Fold-out fin
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsLyle D. Kayser, T. Gordon Brown
Life of this patent
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Abstract
A fold-out fin has a fin geometry defined by two cross-sectional cuts through the cylindrical projectile body, both cuts being parallel to the boattail surface. This geometry insures that the stowed fin assembly fits within the gun tube. This geometry also exhibits low drag and good aerodynamic behavior. Upon launch, the fins are deployed and then locked in the fully open position with a spring loaded pin.
Claims14
A projectile comprising:
- a cylindrical projectile body having a longitudinal axis and a tapered non-conical boattail;
- at least two elliptical fins, each of the fins having a size and a shape defined by two parallel planes that intersect the projectile body at an angle parallel to the boattail;
- and
- hinges for connecting each of the fins to the boattail.
1 more element
A projectile for launching from a gun tube, comprising:
- a cylindrical projectile body having a longitudinal axis and a tapered non-conical boattail;
- at least two elliptical fins, each fin having a size and a shape defined by two parallel planes that intersect the projectile body at an angle parallel to the boattail, the projectile with folded fins having a diameter such that it fits in the gun tube;
- and
- hinges for connecting the fins to the boattail.
1 more element
Dependencies are inferred from the claim text.