What’s “dorsal fin”?

[Ref Youtube]

The more powerful the engine, the bigger the fin and rudder are needed to counteract the aerodynamic force during engine failure situation.

However, the bigger and higher fin may be oversize and cannot be fitted into a hanger. Therefore, manufacture can use the dorsal fin.

Dorsal fin doesn’t intersect straight into the airframe, but prolongs that increases the surface and the size of the fin so that the effectiveness of rudder is increased without increasing the overall size of the fin.

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