  A "drivebelt" stadium billiard with boundary consisting of circular arcs of
differing radius connected by their common tangents shares many properties with
the conventional "straight" stadium, including hyperbolicity and mixing, as
well as intermittency due to marginally unstable periodic orbits (MUPOs).
Interestingly, the roles of the straight and curved sides are reversed. Here we
discuss intermittent properties of the chaotic trajectories from the point of
view of escape through a hole in the billiard, giving the exact leading order
coefficient $\lim_{t\to\infty} t P(t)$ of the survival probability $P(t)$ which
is algebraic for fixed hole size. However, in the natural scaling limit of
small hole size inversely proportional to time, the decay remains exponential.
The big distinction between the straight and drivebelt stadia is that in the
drivebelt case there are multiple families of MUPOs leading to qualitatively
new effects. A further difference is that most marginal periodic orbits in this
system are oblique to the boundary, thus permitting applications that utilise
total internal reflection such as microlasers.
