On Fri, 16 Dec 2016 05:43:36 -0800, orsica wrote:

Polydihedral wing already has an increased roll stability, moving the
wing upward increase further roll stability.

More to the point, tip dihedral and polyhedral both give more stability
that a single panel dihedralled wing for a given tip rise jjust as a gull
wing gives less stability.

Whether you get more or less stability from a given dihedral schema
depends on both the amount of wing sweepback and the hight of the tip
above the root.

The JS3 and Arcus both use sweepback as well as polyhedral, so can use
less dihedral to achieve the required lateral stability.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |