Looks like we're dealing with three topics at the same time:
1) VC heliduplex - the original question.
2) Skeetz's "Helice-Gripp" and whether it is actually VC.
3) the whole topic of "Helice" (generic Helical) and it's multitude of permutations.

Last edited by Argo44; 05/05/17 11:16 PM.

Baluch are not Brahui, Brahui are Baluch