Thanks Andy!
I did actually make a frame saw like that once. It was quite a long time ago, probably before I was posting anything online, but probably influenced by online discussions or blogs. In my ignorance I used the only long blade I could buy in our local tool shop, which was a narrow, coarse blade from Bahco, 450mm long, designed to go in a pressed metal frame and be used to cross-cut growing trees or logs. Unsurprisingly, I never got on with it and it lies in a dark corner gathering dust.
However, one thing that is clear in your picture is that you are sawing at 90 degrees to the long axis of the wood. Although I omitted to photograph it, what I was doing with my ECE saw was to use it like an English saw, at about 45 degrees, letting me sight along the line and have plenty of blade in the wood to help it steer straight.
I've just been and checked on one of the few German YouTube channels that I have found covering hand work. In this video, Jakob uses a saw like mine to rip a thick plank of pine.
But his grip and angle are quite different - he holds the frame with both hands (a bit like your frame saw) and works at 90 degrees to the wood.
I now think that the relaxed tooth angle is appropriate for working like that. I'm used to avoiding it, because I am used to using an English saw that needs to be sloped at 45 degrees. On the next piece of similar wood that I rip down, I shall try that instead.
I do note, however, that he stops filming half-way for a rest - that's something I'd already worked out for myself!
[youtubessl]oxxXYANYk1I[/youtubessl]
https://youtu.be/oxxXYANYk1I?si=VUafQ-IoucyDUoKQ&t=19
