On Sat, 09 Dec 2017 13:13:31 -0800, Tango Whisky wrote:

On the SB13, the pitch oscillation was discovered to couple to the
bending mode of the wing. The spar was therefore build with hogh modulus
fibres (a first in aviation) in order to push the bending frequency out.

Fair enough. I've subsequently found similar comments about the Horten
S.IV and the DH.106.

All in all, tricky optimisations. Plus a complicated lay-up plan for the
swept-back spar in order to get the torsional load into the wing skin.

From what I've read this seems to be a major problem with all swept
tailless designs.


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Martin | martin at
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