1. It changes working radius usually by luffing jib.

2. Figure 2.3-1 Sailboats Trimmed, Backwinded and Luffing Module navigation

3. It will demonstrate nicely the difference between a Backwinded main and a luffing main

4. The mentioned method is applied to design of pulley block compensation in luffing mechan ism and the results show that the method is feasible and effective. Sentencedict.com