Keel fin (aviation)

In an aircraft , the designated Keel a fin shape , in which the fin attaches already far forward on the body, initially quite flat extends rearward to move and then swung into the actual rudder. The term is rarely used today; it can be found in literature between 1915 and 1930. Today the keel fin is called a false keel .

• 

  Jak-12 , vertical tail without keel fin

• 

  Jak-12M, vertical tail in the shape of a keel fin

• 

  the second P-51 from the front has a vertical fin with a dorsal fin , while the remaining somewhat older versions do not have this.

Individual evidence

1. ↑ References 1915..1930:
   • Siegmund Huppert, Guide to Flight Technology , p. 129f, p. 357; J. Springer Publishing House, 1913
   • Dr. Richard von Mises, Fluglehre , p. 251; Springer publishing house, 1926
   • Ludwig Prandtl, Results of the Aerodynamic Research Institute in Göttingen , p. 123; R. Oldenbourg, 1927
   • Ludwig Schiller, Hydro- und Aerodynamik , p. 213, p. 549; Academic Publishing Society, 1930
   • Wilhelm Wien, Handbuch der Experimentalphysik, Volume 4, Part 3 , p. 213, p. 549; Academic Publishing Society, 1930