A few thoughts-

1. That is heavy for a 14 ft. canoe. The canoe itself is maybe 25 kg? I
hope it is just you in a 14' canoe. If so that means you have a very
heavy load. 38" Beam tells me the canoe is built for a pretty good load
- What kind of freeboard do you have with that kind of load???
2. What is the average depth of the waters you will be paddling? If you
really need to anchor, you will need a good height to length ratio.
E.G. if the water is 20 meters you will want 60 meters of rope.
3. Those opening grap anchors are Ok but not great. I would get an
oversized anchor (danforth) and put 6 ft of chain on it. With that much
weight you will need better holding power than what your anchor has. It
does depend on the bottom which is ??
4. The 4mm rode should be fine and tying them together with a
fisherman's knot should be fine also . Ideally you should have a well
supported bow ring maybe 6 " off the water. Otherwise you will have to
attach your rode to the seat strut which in heavy weather would not be
good...

Good luck- It sounds like fun!
Al D wrote:
Can anyone give some advice on selecting anchor rode for my canoe? One
reason for wanting an anchor is as a safety measure in case of getting
blown out to sea. (I'll be canoeing along the South Coast of England).
My open canoe is 14ft LOA, with a 38" beam. I have two 30mtr lengths
of new 4mm nylon braided cord (bought from B&Q). I plan to join the
two legths with a fisherman's knot. Should this suffice? The weight
tolerance of the nylon rope is not stated, but another 4mm braided
nylon rope I saw is rated at 900lb tensile strength. My anchor is an
opening grab anchor. The maximum laden weight of my canoe will be less
than 400kg.

Thank you,

Al D