  The aim of this paper is to study the finite space blow up of the solutions
for a class of fourth order differential equations. Our results answer a
conjecture in [F. Gazzola and R. Pavani. Wide oscillation finite time blow up
for solutions to nonlinear fourth order differential equations. Arch. Ration.
Mech. Anal., 207(2):717--752, 2013] and they have implications on the
nonexistence of beam oscillation given by traveling wave profile at low speed
propagation.
