When I was in Maui in Feb 05, David Dorn of Action Sports Maui showed me how to retrofit my 2004 Naish v4 kites with
a fifth line. I became an instant convert. There are many reasons why 5 lines are better than 4. Here are a few:-
1. Greater kite stability, especially in gusty conditions
2. Much Easier and safer re-launch
3. Much Easier and safer self rescue
4. Much less wear and tear on the kite in small shorebreak*
5. Greater range for the kite due to increased stability
(* Performance of 5th line in surf is a subject of debate, my experience is limited to small shorebreak of one foot or
less)
It costs less than $100 to retrofit a kite and bar. On this web-site you will find what David taught me. But first here
is a link to the Action Sports Maui site