----- Original Message -----
> -I used quad tip plugs to keep the flame kernel from being split by the
> center single electrode.  This sends the flame to the center of the  of
the
> piston, rather than the edges, to reduce the sideways force on the piston
> (the plug is in at an angle and the top of the piston get the force first
> before the bottom). This is important because the force applied to the
piston
> is increased with the power increase.  The four tips ensures firing of the
> plug.

Correct me if I am wrong, but as I understand, the triple- and quad-tip
plugs still only fire to one tip at a time, not all at the same time.

Karl