As a point I think we agree in the most part. But I think we have in mind two different styles of bows in mind.
I have some 3-4mm vinemaple curing if you ever wanted to have a go at it, I could spare a few slats:)
Personally I love plum as a bow wood. A prefer it to Osage to be honest.
That internal friction and fatigue happens to all bows.
When you have how and sinew on either side of your wood, makes it hard to see how well the wood is holding up to frets and that not over time without taking it apart or cutting into it.
No - like I said before the bow style doesn't matter....do you think a pair of buffalo horns know that they are in a mongol bow or a Korean bow.....no they simply feel the strain that is on them. They can either take it or not.
Trust me if your core fails you did something wrong. Just like I said before.
As BowEd says when you learn something yourself, by trial and error, you tend to have conviction in what you are saying.
Cores DO NOT just break for no reason....
The reason a core would break is because it is starting to feel tension. It will only feel enough tension to break it IF the sinew isn't stuck correctly OR is too thin. Of course there may be other reasons but those are the likely candidates.
Just so you know I too have made a good few composites
A good few failures in the beginning but I stuck at it and came through the other side haha. I'm not just spouting off....