A Comparison of The Stability Characteristics of Standard Fin and Slotted Fin Mark 81 Low Drag Bombs
NAVAL WEAPONS LAB DAHLGREN VA
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This report presents the results of a study to determine if the addition of fin slots and aileron tabs improves the stability characteristics of the MARK 81 low drag bomb. Representative samples of both the standard MARK 81 low drag bomb and the slotted fin version were dropped at three separate flight conditions. Excessively large angular rates were purposely imposed in order to induce large yaw and therefore test the ability of the bombs to stabilize. The results of the study show that fin slots and aileron tabs eliminate catastrophic yaw due to roll lock-in. However, slow damping of an exaggerated initial disturbance can still result for a region of spin rates above resonance. This slow damping phenomenon can possibly be eliminated by proper selection of aileron tab angle.
- Aerial Bombs