One thing about sizing rope, particularly spectra and dyneema in longer lines is that we are sizing it for stretch not breaking strain. Eg, I replaced the 3mm wire main halyard on my Etchells with 5mm dyneema sprliced into 8mm spectra. Way stronger than the 3mm but going strength for strength would of meant the dyneema would of stretched under load. Also 3mm is a bugger to cleat!!
Interesting uses that I have done..............
-soft shackle for clew strap
-standing rigging for Sabot's and Sabre's
-Sabre boom without a single shackle and only 9 rivets
- Standing rigging on 50ft ketch
-endless control lines on dinghys/sports boats, meaning you never have the slack on the wrong side
-bobstay wires on cats of all sizes
-small endless loops for 1000's of uses, eg. spliced 50 for a 1000ft ally yacht where the snap shackles damaged the deck attachments and rattled around, solution, cow hitched endless dyneema loops
- soft shackle to attach headsail to furler
-dyneema for the rope around the bottom of bushwalking gators, outlasts poly rope by aleast a factor of 10, look here
tasgear.com.au/