Mast butt location

[Jeff Eiber]

Here are the current (5/2013) VX One class rules for the mast butt position:

C.9.5   MAST
(a)   USE
(1)   Bolts shall be secured in the mast step track in the fourth hole from the front and third hole from the rear.  The mast tenon shall be stepped in the mast step track in such a way that the tenon shall be fixed against the aft bolt.
(b) 2. Mast Butt Position:  Bearing surface of aft mast track bolt to aft face of top rudder pintle.   Minimum = 3326 mm, Maximum = 3336 mm

The mast step track is installed in the boat using a jig which references the forward facing surface of the molded-in center foot rest so that the position of the mast tracks are the same from boat to boat.  Also, the track is symmetric front to back so that the track may be installed with either end forward.

[kpike]

Just an aside. I looked at the US143 base and the rear bolt is in hole #2.  I will move it forward. I noticed the mast had some movement for and aft.