I added some important brands and so I repost this.
Be aware, that it doesnt matter where the hammer is, if you look to the physics of a lever. The 200% arrows are as accurate as I could do.
This is exactly the middle point between pivot axis and keyfront.
Fatar TP100 looses definitely. It is however, only a small difference so go into the next musicstore and try out, if this matters to you
The real Grand Piano is -of course- the absolute winner.
Unknown grand piano Model. I think it is a 9 foot model.
Taken from website of german piano industry association.http://www.pianos.de/de/das_instrument/index.php?id=20
Force-arrows in all images added by me.
Kawai Grand - unknown model. I think it is a 6 foot model.
Keylength compares to a Yamaha G2 5'7 Baby Grand, I checked this.
Upright - unknown model
Casio Tri Sensor
Fatar TP40W (NUMA Nero)
Fatar TP 100 LR (Numa Piano)
I find this is a much more important criteria to compare a digital action to a grand piano action.
Heavy and graded weighting is something that the piano builders fight. They try to minimize it.
They try to maximize keylenght.
So the advertising arguments that are sometimes given to unknowing people are somewhat misleading.
No DP reaches a grand and most dont even reach a lower class upright in keylength.
So many DP's just combine the disadvantages of a Grand -heavy grading and weighting- with the disadvantage of an upright - short keys.
This is then advertised and sold as a accurate modelled grand action. They all tell lies to their unknowing customers ;-)
Yes they all try to get a good touch and feel, but none of them tries seriously to emulate the most important and basic and obvious physical parameters of a grand action accurately, because thats too expensive.
Because grading and weighting are also attributes of uprights, (and match much better) the comparison to a grand is nothing else than intentional misinforming advertising.