These are the SDT (carpentry) jointing techniques used by the World’s experts.  They make any meaningful engineering analysis impossible:

All of the following expert entities are aware of the LPSA technology.  They have all chosen not to challenge it but simply ignore it, refusing even to discuss the “merits” of their systems, shown below:

1.  A European-funded consortium from: Austria, Finland, France, the Netherlands and UK.  Their final report (1999) is available at:

2.  The Forest Products Laboratory, USA.  See:

3.  TRADA, UK (Timber Research and Development Association):$FILE/crwoodproducts27.pdf