A tow line is made of poly propylene, have you ever used a rolling hitch on
polyprop? Since the material does not have typical characteristic of normal
rope or lines, it does not hold a rolling hitch, it just unwinds itself.
Polyprop is not conducive to many of the conventional knots, including a
sheet bend. Most towlines include a loop at the end of the line. They
sell products that allow you to quickly attach a tow toy to a tow line, but
if you want to save the money use a short piece of nylon line and use a
bowline to attach the two loops. One of the features of a bowline is it
easy to untie after having a heavy strain placed on the knot.




wrote in message
oups.com...

Sal's Dad wrote:
Consider a knot - or, more precisely, as you are joining two lines
together,
a bend. Several can be found, with animated instructions, at
http://www.grogono.com/knot/ .

You could also fasten the tow line directly to the fitting on the
tube. I
seem to recall there being a rationale for NOT taking this approach,
but it
escapes me at the moment.


Or, you could use a hitch, a rolling hitch works well.