Hi, Gil
I'm asking myself the same question.
Rusty Knowlton uses them with good results.
He's on the site somewhere.

Bob Z.

For 1/2a I’ve used braided fishing line exclusively for several years. Very flexible. No stretch. Way more steady than Dacron. I use braided spider wire. 20# test. It is the same diameter as 6# monofilament. I do not recommend monofilament. Tried it, didn’t like it. There are several good brands to choose from. I think most people look for one that specifically says spectra on the package.

You have to make knots that don’t slip or weaken the line. I use a clinch knot because the main part of the line stays straight and all the twisty stuff happens on the tag side of the line connection. I also leave a short tag so it is easier to check for slippage. Lots of people swear by the palomar knot and it is a good one. Do not use a crimp or tie like you would on steel lines. It’s overkill for 1/2a and there’s to much chance of a crimp damaging the line.

After braided fishing line I would not go back to steel. I’ve never tried it on a larger model. Some people have and love it.

I usually keep 35 and 40 foot lines made up. I switch back and forth depending on the model and the wind.

At the risk of being overly repetitive, look for BRAIDED, not monofilament.

Braided PowerPro Spectra, 30 lb test. Zero issues. Smaller works, too. Flying on this stuff is much more like using .008 stranded steel cable than the old 1/2A Dacron, but nowhere near the handling care required to avoid damage. Monofilament fishing line is a non-starter for model flying unless you are just G-lining a rock on a string.

The Divot

This is what I use

A suggestion only. There are other good knots and you may find one that works better for your use. I don’t always use the same knot.

Thanks for the illustration Wayne!  Serendipity, I hope to tie some lines later today and just came here to see any new construction, the line discussion is a bonus.

Dennis