JS3 chatter

The included 3-view only shows 15M. Is it not intended to be 15-18M?

On Thursday, December 15, 2016 at 10:01:02 AM UTC-6, wrote:
The included 3-view only shows 15M. Is it not intended to be 15-18M?

Spec page says it has a 4 piece wing. Doesn't look like enough "crank" in the wing to be a real trailer issue. I would guess there may be another span option to follow soon.

Steve Leonard

It was noted on Facebook that the Vne chart on the panel lists 15m and 18m spans. Jump to your own conclusions...

My calculator says 267 kg empty with 8,7m2 wing.

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

I don't know if this is an advantage.

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
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