How to make a sword trace?

I already use TrailRenderer for bullets, but when a sword moves forward it looks this way:
29150-sw2.jpg
(The trail is too wide for this movement)


When I replace a single TrailRenderer by a combination of multiple, they overlap:

29151-sw1.jpg

Cant use trail render for sword.trail renderer quad will always face camera.trail sprite should be always parallel to sword orientation.

U can use these references as a starup

Time based trail renderer

http://forum.unity3d.com/threads/meleeweapontrail.99924/

Pocket RPG Weapon Trails