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2 votes
1 answer
124 views

How could a ballistic mask provide full protection without compromising the wearer's singing voice?

So, I'm having trouble with one of my character designs. Guardian angels are former humans who died in such dumb ways that Heaven simply couldn't let them in, not before they proved they can prevent ...
Mephistopheles's user avatar
9 votes
2 answers
564 views

How do I determine the physical size of a quartz crystal of a given shape and vibrational mode needed to approximate a specific resonant frequency?

So, one of my D&D characters has a cut/relief-carved quartz crystal amulet (medallion shaped) that's both an arcane focus (crystal) and a holy symbol (amulet), and I thought it would be a good ...
Shalvenay's user avatar
  • 11.3k
3 votes
1 answer
374 views

How quiet can a static, non-propulsive pulsejet be?

The wizards of Magitechia have discovered that the deflagration or detonation of certain chemical compounds have beneficial supernatural effects, that are useful for powering magical apparatuses. ...
Eth's user avatar
  • 4,648
4 votes
2 answers
204 views

How would building an acoustic amplifier into a large scale rockface work?

I'd like for this to be how a small species communicates with a giant species. I was assuming a series of tunnels would carry the sound like a pipe organ.
Nyboria's user avatar
  • 41