What's all this I hear about Inertia ?

[Ron Nossaman]

> If you have heavy hammers, or a high action ratio, or even worse both, 
> you will start to end up with too much lead in the key unless you are 
> using assist springs. These actions are not going to 'feel' right even 
> though they may have great numbers. I don't know any way too measure 
> this easily with weights at the key board, but I have become pretty good 
> at feeling it through all the great mistakes I've made.
> Respectfully,
> Fenton

And assist springs won't make up for the heavy hammers in the 
inertia battle.

I've tried to point out before (Not to you, Fenton, to the 
list), that the excess lead wouldn't be in the keys in the 
first place unless the hammer weight is too heavy for the 
action ratio. I don't think key lead has a lot to do with down 
stroke inertial feel. You'll get a similar feel with less key 
lead and more spring assist because you're still accelerating 
a heavy hammer at a nominally 5:1 leverage ratio. The root 
problem is hammer weight. Key lead inertia problems will show 
up in repetition, where the rep lever spring has to shove the 
back of the key, lifting the heavy front, for the jack to reset.

My take,
Ron N