Gallery, Projects and General > How do I??
humming fly wheel
DaveH:
Kenneth,
Slowish 50 - 100rpm Hub about 1/2 inch or so.
DaveH
DaveH:
Has anyone seen a whistling yo yo.
Wondering how they work - number of holes ect.
DaveH
BiggerHammer:
The old Duncan company sold many different whistling
tin yo-yos. These varied in size and had many different
designs on them. Many patterns were very colorful like
the one pictured here, with very detailed logos. Others
were simple one color models with an ink stamped logo.
All of them had one thing in common ... a tin outer shell
with two to four quarter inch holes on the outside edge
of each half. As the yo-yo spins, air is drawn through
these holes, creating a whistling or humming sound.
Each half usually had a different number of holes. This
was clever because each half would make different
sounds at different speeds. I want more tin whistlers.
Found that.
Now a question. Does the flywheel itself have to whistle or could you mount a plate with holes in it or a tube with one closed end in close proximity to the flywheel and let the air being dragged by the flywheel make a whistle? Not sure if the physics would create the desired effect though.
And my idea would be to Drill holes in the flywheel and insert closed end tubes into it. You could then change the geometry of the tube end until that puppy whistles.
DaveH:
Thanks BiggerHammer,
Worth a try I'll see what happens :)
DaveH
BiggerHammer:
--- Quote from: John Hill on April 22, 2011, 04:27:51 PM ---I think you need interrupted air flow to make it hum.
Perhaps hollow spokes open near the hub end and hollow right through to holes in the outer rim, put something near the flywheel for the air to impinge against. If you can get your engine up to 10,000 rmp or so you will have a siren!
Thinking further, you might not even need the holes at the hub end, just hollow spokes with holes in the flywheel rim.
--- End quote ---
Oooooo..... looks like I had the same ideas as you with only minor differences. You were here with the ideas first and a more accurate description. I guess I should have read the responses a bit more thoroughly. My apologies. It was late and a long day at work with a 3 hour commute home.
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