Racquet customization question

[TysonMcMuffin]

I was reading through tennis warehouse university articles and I can't seem to understand these two different experiments. If anyone knows anyone on this thread who I can tag at twu that can help or if anyone is more literate in physics then maybe they can help me understand.

In the conclusion of this article, it says that adding weight will result in more spin no matter the location (depending on lead tape placements, spin can vary but more weight will result in more spin).

On the other hand, this tool shows that weight added with the same swing effort will decrease spin, and weight added with the same swing speed will result in the same amount of spin.

How does this make sense? I remember the old youtube channel Racquet Tech was on the side of increased swingweight = more spin, so I'm inclined to believe that, but I'm not sure. Maybe @Irvin can help out, I've seen you explain some complicated topics.

 

[TysonMcMuffin]

Also, while on weird racquet concepts, does high recoil weight make up for low twist weight to a certain extent and vice versa? This quote from twu says stability in one direction can make up for instability in another "But as usual, when it comes to actual power performance, our rules of thumb are only that. For example, a high twistweight, large-headed racquet may also have a low swingweight. So even though it is stable right-to-left, it is unstable tip-to-butt. When it comes to power, movement in one direction can cancel stability in another, or contrariwise, stability in one direction can more than make up for instability in another. The graph at right shows that there is a relationship between power and twistweight on off-center hits (impact at 3 o'clock), but the relationship is not as strong as with swingweight."

 

[Irvin]

On the other hand, this tool shows that weight added with the same swing effort will decrease spin, and weight added with the same swing speed will result in the same amount of spin.

Spin mainly comes from technique. But the greater the RHS the greater the spin. If a player applies the same effort, RHS goes down, RHS goes down, and so does spin. On the other hand is the RHS remains the same, more effort, spin remains the same. I’m just guessing here but that my first thought.

I’m with you though, I can’t understand the other statement where adding mass always increases spin.

 

[Irvin]

In the conclusion of this article, it says that adding weight will result in more spin no matter the location (depending on lead tape placements, spin can vary but more weight will result in more spin).

Again I’m guessing here but maybe this statement refers to the potential of the racket and the grater the inertia the greater the force once it is in motion, so the racket has the potential to create more spin.

On the other hand, this tool shows that weight added with the same swing effort will decrease spin, and weight added with the same swing speed will result in the same amount of spin.

Here they Are talking about the players potential. Technique is primary but the RHS is directly proportional to spin.

 

[TysonMcMuffin]

On the other hand is the RHS remains the same, more effort, spin remains the same. I’m just guessing here but that my first thought.

First off, thank you for the explanation!

I'm still a little confused on these 2 things.

So let's say for 2 different racquet setups, one with higher SW and Static weight; the other with lower SW and lower Static Weight, if they are both swung at 50mph (meaning that someone put more effort in to reach the 50mph on the heavier racquet), the spin will be the same? That seems to be what the experiment is suggesting. I thought since the heavier racquet would have more inertia, it would create more spin once it's going at the same speed?

I apologize if I worded this poorly or if I'm misunderstanding the concept of inertia and or speed. I'm not a physics major so even when I try to read articles about the independent properties, they're hard to digest.

 

[Irvin]

First off, thank you for the explanation!

I'm still a little confused on these 2 things.

So let's say for 2 different racquet setups, one with higher SW and Static weight; the other with lower SW and lower Static Weight, if they are both swung at 50mph (meaning that someone put more effort in to reach the 50mph on the heavier racquet), the spin will be the same? That seems to be what the experiment is suggesting. I thought since the heavier racquet would have more inertia, it would create more spin once it's going at the same speed?

I apologize if I worded this poorly or if I'm misunderstanding the concept of inertia and or speed. I'm not a physics major so even when I try to read articles about the independent properties, they're hard to digest.

Same speed the heavier racket might give you more spin but you’d probably not notice any difference. If one racket is lighter with the same player you probably have a higher RHS which also increases spin.