W przypadku żaglowca w rodzaju rzeczonej "Wyoming" "length measured from jib-boom tip to spanker-boom tip" to po prostu długość całkowita.
W kontekście nazewnictwa masztów wielomasztowców pozwolę sobie podać taki przykład:
The naming of her masts was always a subject for some discussion. In the original sail plan and during construction named (fore to aft): 'no. 1 to no. 7', no. 7 being replaced by "spanker mast" later on. The names of the masts changed then to: 'fore, main, mizzen, spanker, jigger, driver, and pusher' at launch and to: 'forecastle, fore, main, mizzen, jigger, and spanker' after launch. Later on a lot of different naming systems were formed, e.g. 'fore, main, mizzen, rusher, driver, jigger, and spanker' or 'fore, main, mizzen, no. 4, no. 5, no. 6, and no. 7', the naming preferred by the crew (which incorporated a possible misunderstanding between "fore" meaning "foremast" and "mast no. four"). Even a naming after the days of the week was discussed with the foremast being named "Sunday" and the spankermast "Saturday".
http://en.wikipedia.org/wiki/Thomas_W._Lawson_(ship)Patrz tez
http://www.bruzelius.info/Nautica/Ships/Schooners/TWL(masts)...