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Simple Physics: Blade weight

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Topic: Simple Physics: Blade weight
Posted By: Rollko
Subject: Simple Physics: Blade weight
Date Posted: 10/09/2020 at 8:30am
Hi all,

Given simple physics rules, we know that a moving object with a certain weight will deliver more momentum than a lighter object (both moving with the same speed). 

Imagine two scenarios: the first one with a heavy blade and light rubbers, and the second one with a lighter blade and heavier rubbers. Assuming the weight of these two set-ups is the same, and the centre mass of gravity is in the same position, which one will be a more favourable option for offensive looping game? Would a lighter blade be a less favourable option, despite the overall weight being the same?

In other more simple words, for a BH short pips player, will having heavier short pips on BH help with the momentum and power of the FH, or will that be pretty much fixed with the weight of the blade providing the core of the power?



Replies:
Posted By: chroot
Date Posted: 10/09/2020 at 8:44am
The same swing speed & contact point, heavier & harder blade will generate more energy on the ball. In terms of the rubber, it's not simple like that. The hardness of the sponge, the tackiness of the surface and the way you contact the incoming ball, etc will all impact the quality of your shot. 


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BTY Viscaria 90g
DHS Hurricane 3 NEO, 39/2.1
BTY Tenergy 05 1.9

http://mytabletennis.net/forum/forum_posts.asp?TID=62263" rel="nofollow - My Feedbacks


Posted By: fmarek
Date Posted: 10/09/2020 at 10:04am
In simple words - SP and LP should have been banned from the game long ago.

But to your question - go with the same setup which you train with your coach every week.

Yes I am rolling :) Jus cannot help the moment I see SP/LP or BTY dick*nicks.


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DHS HL5, FH: 729 Battle II Gold H40, BH: Palio HK1997 Gold


Posted By: cole_ely
Date Posted: 10/09/2020 at 10:15am
Originally posted by Rollko Rollko wrote:

Hi all,

Given simple physics rules, we know that a moving object with a certain weight will deliver more momentum than a lighter object (both moving with the same speed). 

Imagine two scenarios: the first one with a heavy blade and light rubbers, and the second one with a lighter blade and heavier rubbers. Assuming the weight of these two set-ups is the same, and the centre mass of gravity is in the same position, which one will be a more favourable option for offensive looping game? Would a lighter blade be a less favourable option, despite the overall weight being the same?

In other more simple words, for a BH short pips player, will having heavier short pips on BH help with the momentum and power of the FH, or will that be pretty much fixed with the weight of the blade providing the core of the power?

We had a long thread about weight and speed a few years ago. One poster presented math saying the weight of the blade had a very minor impact on the speed.

As to the weight being on the outside vs inside, I would think no impact.


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W1 St with Illumina 1.9r, defender1.7b

Please let me know if I can be of assistance.


Posted By: stiltt
Date Posted: 10/09/2020 at 10:33am
In numerous discussions we had about this, people said that sure, at equal speed, the heavier blade will produce a faster/spinnier ball however it takes more strength to bring the heavier paddle to the same speed than the lighter one so by applying that additional strength to the lighter blade, it fills the gap.

Of course we can milk flies with boxing gloves saying that the rebound is more pronounced on the heavy blade or crispier on the lighter one giving all kind of speedy outcomes but frankly, we are reaching splitting hair territory.

TBH, I do think heavier blades are better and faster but it's all feel based on a (pseudo?) reality: the dwell on a heavier blade is higher, giving more control, but the bounce will be more powerful and will catch up with the same bounce coming from a lighter blade where the dwell might be lower but the bounce erratic. That feel of control that heavy blades give is hard to replace in lighter ones and I think it comes from the wood: weight transfer from the wood to the rubber will not absorb energy from the ball the way the wood does.

We could go on and on...and let's do it, it's fun :)



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Posted By: zeio
Date Posted: 10/09/2020 at 2:36pm
Interesting thought experiment.

From the standpoint of modal analysis, despite both cases having otherwise identical center of gravity, the mass of Case 1 is distributed closer to the blade head(more mass inside the blade) than that of Case 2. Case 1 should therefore experience less flex at the neck where the blade head and handle meet, which should result in less energy loss for bending modes. OTOH, the harder rubbers should make up some loss ground in Case 2 for membrane modes, but since the rubbers themselves would cause a substantial downward shift across all modes for both Case 1 and 2, that will likely cancel out the boost.

Theoretically speaking, Case 1 should be more balanced between loop-driving and speed-driving. Case 2 should be more suited for loop-driving.

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Viscaria FL - 91g
+ Neo H3 2.15 Blk - 44.5g(55.3g uncut bare)
+ Hexer HD 2.1 Red - 49.3g(68.5g 〃 〃)
= 184.8g


Posted By: cole_ely
Date Posted: 10/09/2020 at 2:40pm
before we go on, should we verify that the OP isn't Sjan?

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W1 St with Illumina 1.9r, defender1.7b

Please let me know if I can be of assistance.


Posted By: mjamja
Date Posted: 10/09/2020 at 2:53pm
Right. 

Simple physics just like

Simple Middle East Peace Agreement
Simple Bipartisan Legislation
Simple Determination of best rubber for left handed side-spin looping of underspin.

Mark - A simpleton who knows nothing is ever really that simple.


Posted By: chroot
Date Posted: 10/09/2020 at 3:43pm
Originally posted by mjamja mjamja wrote:

Right. 

Simple physics just like

Simple Middle East Peace Agreement
Simple Bipartisan Legislation
Simple Determination of best rubber for left handed side-spin looping of underspin.

Mark - A simpleton who knows nothing is ever really that simple.


LOL

Simple rule to keep each candidate's 2 min of speech time not being interrupted in the debate.Big smile


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BTY Viscaria 90g
DHS Hurricane 3 NEO, 39/2.1
BTY Tenergy 05 1.9

http://mytabletennis.net/forum/forum_posts.asp?TID=62263" rel="nofollow - My Feedbacks


Posted By: BH-Man
Date Posted: 10/09/2020 at 4:15pm
The question was presented in a too over-simplified manner.

There are many more things going on with whip mechanics and impact dynamics that contribute to the result.

Some of the factors are correctly presented but do not account for all that is happening.


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Korea Foreign Table Tennis Club
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