Hi Alan
Go to my website
www.telemastersalesuk.co.uk, click on "Your Telemasters" and have a look at Tony's STM, Bryan's Senior and Chris Robson's model. They are all shown in the balsa.
The wing is made up of spars which run from tip to tip and ribs which go from the leading to the trailing edge of the wing. On the STM the main spars are made of spruce and are arranged as a pair, one on top of the other at the thickest point of the wing rib. Tony and Chris have used diagonals to strengthen the wing as shown on the box art. Bryan has used triangular gussets with the grain running across the diagonal on his version. Whichever method you chose to strnthen the wing will require extra balsa wood. The tail plane is also made up of ribs and spars.
The longest strips in the fuselage are called "longerons." They are joined by vertical and horizontal "spacers." "Formers" keep the fuselage square.
While the powered aeroplane first flew in America, much of its subsequent development took place in France, that's why the names of so many of the components are French e.g: fuselage, aileron, longeron, and in the USA empanage for the tail plane.