Yamaha piano key length

[mark goodwin pianos]

I'm building up a list of key lengths of various popular Yamaha pianos. Why? Because customers seems to enjoy researching this kind of thing.
So far I've got the following

Yamaha B1 30.1cm
Yamaha U1 37.5cm
Yamaha U3 40.4cm
Yamaha C1 46.7cm
Yamaha C3 49.8cm
Yamaha C7 55.1cm

The C7 key is 83% longer than the B1. I wonder if the CFX key length is even longer? Probably!?

I put my initial findings into a video which you can see below. Based on some feedback in the comments on Facebook I'll make a new video soon to cover more aspects such as inertia and some info from the people at Precision Precision touch design platformTouch Design Platform Facebook group

Here is the video so far

[keypeg]

Well explained.