The outer layer formed the complete shell shape and the progressively shorter, Y-shaped inner laminations strengthened the bade towards the root.
To stiffen the blade, small shouldered cylindrical struts were then inserted through the face and externally soldered at each end.
The hubs allowed easy ground adjustment of pitch to any angle;[3] if one blade was damaged, it could easily be replaced.
[6] Around 1928, the company reformed as Metal Propellers Ltd, with board members who also had positions with Saunders-Roe, Spartan Aircraft Ltd and British Airways.
[1] Metal Propellers Ltd were still sending apprentices to Saunders-Roe on the Isle of Wight for an initial training year in the mid 1950s.