...The triple-plain wire unisons extend much further down the scale. That's why concert grands can get up near 60-70,000 lbs. of tension. But the wire is NOT thicker or heavier for any given note. The opposite is true, sir. In fact, concert grands generally use a lighter wire than an upright or spinet for any given note; because they can use the LENGTH of the piano instead of the WEIGHT of a shorter thicker string.

a 9-ft does have significantly more tension overall. But that is because there are simply more strings in the piano! The triple-plain wire unisons extend much further down the scale. That's why concert grands can get up near 60-70,000 lbs. of tension. But the wire is NOT thicker or heavier for any given note. The opposite is true, sir. In fact, concert grands generally use a lighter wire than an upright or spinet for any given note; because they can use the LENGTH of the piano instead of the WEIGHT of a shorter thicker string.
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1st premise -- longer strings higher tension for a given pitch: Correct
2nd premise -- thicker strings higher tension for a given pitch: Correct.

Conclusion-- Longer pianos almost always have longer and thicker strings (and therefore have higher tension): Incorrect.

They may be longer but are not necessarily thicker. Bass strings on a 9' piano will always be significantly thinner than on a spinet. String lengths from c-52 up to c-88 on a 9' piano won't be much different from on a 45" upright.

There are 4 basic styles of stringing scales . . .
short scale/low tension
short scale/high tension
long scale/low tension
long scale high tension

Scaling style is not governed by the length of piano. For example, S&S "D" has a shorter scale (and lower tension) than the Kawai GS 100 scale which is a long scale/high tension scale. Both are 9' pianos, but that model of Kawai has a much higher tension scale.

Greetings,
I don't think additional tri-chords will require that much more tension, but I have a factory listing of tension in the Steinway pianos and it lists the D as having approx. 45,000 lbs. The D uses a 13 1/2 wire at the top, the S uses a 12 1/2.
Regards,

If I remember correctly, the D has a top C measuring less than 2". The S top C measures more than 2" or at least significantly more than the D.

Anomalous but interesting.

I am not certain whether those dimensions are correct, because there can easily be sample error in that range of the piano, but even if they are, the longer speaking length would call for a thinner gauge to maintain the same tension.

As a retired English professor, I would point out that abbreviating a phrase conventionally euphemises it--and thus removes any profanity. Also, while there are several synonyms for the phrase "lose one's virginity" that could qualify for the usage labels "vulgar" or "obscene," there is no coarseness in the phrase itself.

Are the NY Steinway D's have the same scale than the Hamburg ones ?

Yes. At least on paper

The S scale is a bit of an anomaly - the speaking length is 54 mm. The other models are all 49 mm, except for the C and D which are 50 mm.
As I understand it, Steinway grands are in low tension scale area, except for the high tension models C and D. The S is a bit of a separate animal; some might say a nice piece of Steinway furniture.

Yes. At least on paper

The S scale is a bit of an anomaly - the speaking length is 54 mm. The other models are all 49 mm, except for the C and D which are 50 mm.
As I understand it, Steinway grands are in low tension scale area, except for the high tension models C and D. The S is a bit of a separate animal; some might say a nice piece of Steinway furniture.