Why does carbon fiber sound like metal when it vibrates?

dkmura

Semi-Pro
CF doesn't sound like metal at all. It has its own vibration and sound, depending on the type of CF and the layup. Ask anyone who's hit with a Head 'redhead' pro, Wilson T2000, Yonex YY8700 or other classic metal racquet.
 

joah310

Professional
Head mg rad mp. When i tap the frame with my knuckle it kind of sounds like my aluminum baseball bat. I dont know if its just a frequency match or what but they seem to sound very similar to me.
aluminum is gonna have a much higher pitch than the graphite on the racket you'll hear more of a ping on the aluminum
 

Djokovicfan

Semi-Pro
aluminum is gonna have a much higher pitch than the graphite on the racket you'll hear more of a ping on the aluminum
I never had a metal racquet. I just was listening to the frame when i tapped it and i thought it sounded alot like tapping a metal kettle. I would have expected the 2 to have very different signatures. But i guess carbon and plastic molds end up vibrating similarly to at least some metal objects, for whatever reason.
 

joah310

Professional
I never had a metal racquet. I just was listening to the frame when i tapped it and i thought it sounded alot like tapping a metal kettle. I would have expected the 2 to have very different signatures. But i guess carbon and plastic molds end up vibrating similarly to at least some metal objects, for whatever reason.
I think the biggest thing is that it's hollow
 

Booger

Hall of Fame
As customers, we should all be demanding foam filled frames. Non-foamed frames feel like hollow toys.
 

stringertom

Bionic Poster
That depends on the type of bamboo. I have had people argue that my bike is painted to look like bamboo after tapping it and going by sound.
If I tapped with my knuckle a Bambooman, then a heavy metal man and finally a quadruple amputee man with 4 carbon fiber prosthetics will they vibrate at complementary frequencies or will I need to tune them up before they can be heard in public together???

p.s.: got any spare papers? I need to twist one after reading this thread!
 

Bambooman

Professional
If I tapped with my knuckle a Bambooman, then a heavy metal man and finally a quadruple amputee man with 4 carbon fiber prosthetics will they vibrate at complementary frequencies or will I need to tune them up before they can be heard in public together???

p.s.: got any spare papers? I need to twist one after reading this thread!
Sounds more like you've used up all your papers and then read the thread.
 

Djokovicfan

Semi-Pro
If I tapped with my knuckle a Bambooman, then a heavy metal man and finally a quadruple amputee man with 4 carbon fiber prosthetics will they vibrate at complementary frequencies or will I need to tune them up before they can be heard in public together???

p.s.: got any spare papers? I need to twist one after reading this thread!
You dont sound like someone who enjoys learning things.

what an interesting person you must be.
 

Djokovicfan

Semi-Pro
Debatable. It's a small difference, but mostly noticeable only with sound and high frequency vibes.
How do they get the foam in the hoop? Is it used as an expanding agent in the mold instead of pressurized air or do they fill it with foam after the air molding process?
 

Booger

Hall of Fame
How do they get the foam in the hoop? Is it used as an expanding agent in the mold instead of pressurized air or do they fill it with foam after the air molding process?
After they pop it out of the mold, they attach a foam spray head to the bottom part of the handle and fill it completely, until excess wet foam starts dripping out.

Once the foam is completely dry, they drill the grommet holes.
 

Djokovicfan

Semi-Pro
After they pop it out of the mold, they attach a foam spray head to the bottom part of the handle and fill it completely, until excess wet foam starts dripping out.

Once the foam is completely dry, they drill the grommet holes.
Cool. Seems weird that it isnt more utilized in the industry tho.
 

stringertom

Bionic Poster
You dont sound like someone who enjoys learning things.

what an interesting person you must be.
I’m sure you will find me quite interesting should we ever meet, perhaps during some down time in between matches at the local pickleball tournament you participate in regularly.
 

El_Yotamo

Hall of Fame
You might want to check your racquet for cracks, if there aren't any external ones it's likely that there's some internal ones or at least some structural damage. Vibrational modes are dependent on geometry (second moment of area) and the inherent stiffness of the material. Basically, if the vibrations of your racquet and an aluminum kettle are similar beyond distinguishability one or both of them is/are probably damaged
 
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