Del, first of all, thanks for your earlier response.
I'm curious about the reservations you have about cantilevered bridges.
I was surprised when I first learned of their existence, not very long ago.
The first things I worried about were:
1. the bridge itself breaking under the string downbearing load (the magnitude of which I really don't have a clue about .....tangent (or some
trig function to be named later) of some small unknown angle times large unknown string tension = clueless)
2. the bridge breaking loose from its soundboard anchors due to the moment arm
3. the moment of the bridge distorting or twisting the soundboard somewhat
4. any of these things happening at a date farther in the future
5. repair or replacement difficulties due to presence of existing anchor screw holes (wild guess here)
6. different energy transfer due to the different configuration (another wild guess)
I understood the reason for using them, i.e. getting a longer speaking length on the string while keeping the bridge/soundboard 'coupling point' away from the edges of the soundboard. (my recollection of the reasoning given)
Once I started looking for them I found them on a wide variety of makes below 7' or so.
So, my questions would be
1. what's the longest cantilever that you've heard of?
2. what are the performance or maintenance problems you would be most concerned about?
3. What are some ballpark figures for the total downward force exerted by the strings to the bridge and soundboard? I mean 200 strings x 3 pounds/string adds up to a pretty good load. Or are we talking more like 200 to 500 grams or so per string here?
4. Which piano makers DON'T use them on their shorter models and what kind of adjustments must they make to avoid them.
No huge rush on this, you can go ahead and eat supper.
And you can ignore the last question (#4) if its too long an answer.
Del's earlier quote:
4] Cantilevered bass bridges are inappropriate on pianos of any size and type, grand or vertical. They can always be designed out of any piano worth building regardless of size. They are a symptom of ancient and misguided design philosophy, not a benefit to performance.