The following are pictures of universal covers of half-twist tight flute surfaces.
In [BHS], Hakobyan created the half-twist tight flute surfaces Xa,b with length parameters defined by:
l2n= alog(n+1)+blog(n) and l2n+1=(a+b)log(n+1).
Below are universal covers of Xa,b.
X4,1
X3.2,1.2
X5.7,1.8
X3.6,0.5
X1,4
X1.5,3.1
X4,1