What is a 1 1/2 wing a/c?

Joerg · 4 November 2003, 03:28 AM

Usually biplanes differ in "Doppeldecker" and "1 1/2-Decker" because of serveral relations between the two wingspreads. Does anyone know an official source where the term "1 1/2-Decker" was determined officially?

Joerg

Lufbery · 4 November 2003, 07:49 AM

I don't know about an official origin for the term, but the more common term I've read to describe the same thing is, "sesquiplane." I think it's a French term.

I hope this helps.

Regards,

Cigogne · 7 November 2003, 06:15 AM

Nieuport aircraft are those most readily thought of as utilizing this particular design practice.

Cigogne

Rob_Owens · 8 November 2003, 10:52 AM

Let's not forget the Albatros "V-strutters" also sesquiplanes. But does "Anderthalbdecker" refer to differences in span AND chord, or simply the span??? ??? Achim, are you there?

Dan_San_Abbott · 11 November 2003, 11:52 AM

Gentlemen:
A sesquiplane means 1 and one half wings. The lower wing in most cases is thetruss wing. It is a solution to provide support and bracing of the full wing by adding an airfoil to the spar of the truss to increase the lift and reduce the drag of the spar.
Blue skies,
Dan-San
P.S. Look at the truss under an Etrich Taube wings.

GrzeM · 28 November 2003, 02:35 AM

Half span too.
Austro-Hungarian Aviatik (Berg) D.II was a "sesquiplan" - had wings with equal chord, but the lower wing was much shorter than top one. It was experimental airplane, but was tested on the front.
G.