Originally Posted by
invisiblehand
Hmmmm, I am a little lost here. But then again, this is a little out of my realm of comfort.
So your saying that given the material of the seatpost that what is important is the distance between your butt and the clamp at the bottom -- not how much material is below that clamp -- since that is what determines the resonant frequency ... sort of like a guitar string. No matter how long the string is, if I clamp the string at the 5th fret, the same note is created.
Think of it like a springy ruler held down on a table with most sticking out over the edge. Tweak it and it will vibrate at one frequency. Now take a floppy ruler and it will vibrate a lot slower due to lower stiffness. The guitar string will also sound a higher note if you increase string tension.