Dear MMD, I was hoping someone may help me with a small question.
I am having a go at making my own singing bird. I am using some
drawings to guide me along but have a question about a certain part.
Unfortunately I live in a singing bird cultural backwater and am unable
to get to see one in the flesh, so here is my question.
There is a rod which gets tapped to set off the whistle. It penetrates
a small pressure box and moves a valve. What stops air moving out the
hole where the rod goes in? Is it just a good fit? Is the movement so
fast that it is neither here nor there? Or does it use a floppy leather
seal to allow movement but not penetration of the rod into the chamber?
I hope this question is in the realm of MMD.
Thanking you in advance,