Head weight: an easier, simpler appoximation of swing weight

[Maklike Tier]

If it was redistribution of mass, that means that I can detect changes probably in the vicinity of one to two decimal places, which I find slightly unbelievable.

[Sgt_Strider]

Update from the latest visit, with bare wts and bare bp calculated.

Arc FB 73.1g 32.6g 301mm Arc 11 86.8g 38.1g 296mm MX70 86.9g 38.7g 301mm MXJJS 4u 84.6g 37.2g 297mm BSLYD 4u 84.3g 36.3g 291mm BSLYD 3u 90.1g 40.0g 300mm TK8000 89.4g 39.3g 297mm NR700FX 83.7g 36,4g 293mm NR700RP 88.4g 38.3g 292mm

Interesting notes:

- dang that 3u bslyd is a beast! more so than tk8000. i had dry swings with all of the rackets and this one takes the cake in swing wt! could've passed for a training racket!

- obviously arc fb felt like a fly swatter on dry swinging...

I'm still relatively new to the concept of balance point, but from what I gather, the higher the balance point, the heavier the head feels right? So from the data that you just produced, does that mean the FB feels heavier than the Arc 11?

[visor]

I'm still relatively new to the concept of balance point, but from what I gather, the higher the balance point, the heavier the head feels right? So from the data that you just produced, does that mean the FB feels heavier than the Arc 11?

No... bp is just one measurement to consider. There's also total wt and shaft stiffness (which is harder to quantify).

If you followed this thread, I surmised that the head wt (ie. 3rd column above) is related to total wt and bp in an equation.

Head wt = (bp/length) x total wt, where length=675mm usually

It is this head wt that I'm suggesting that is important in determining how heavy a racket swings and feels, and how hard it can hit.

So, in the case of FB, it has a bare head wt of 32.6g, which is the lightest I've measure by far so far.

[Maklike Tier]

Oh wait, these are bare weights, no string or over/regripping?

[visor]

Oh wait, these are bare weights, no string or over/regripping?

yeah, as i had originally mentioned in the first table here:
http://www.badmintoncentral.com/foru...20#post2045620

i figured this way is more accurate and consistent, since the weight of strings and overgrips vary too much

[Maklike Tier]

Yeah, true. Pity I don't know what the dry SW is on any of my rackets coz I've always measured it as a wet weight!

Could we devise a calculation to reverse engineer it from the dry specs?

For example....

Karakal PU Super Added: +14g
Factory Grip Removed: -8g
VS850 String: +4g
0.6 Overgrip: +8g

[visor]

@demolidor

These are my data points accumulated on the rackets I've owned over the past 2 years.

Racket Bare wt Bare head wt Playing wt Play head wt Playing bp Trinity2 84.7g 36.2g 94.5g 39.9g 291mm Trinity2 83.9g 35.6g 93.7g 39.3g 291mm TrinityPro 86.0g 38.4g 95.8g 42.1g 295mm MX80 85.1g 37.6g 94.9g 41.3g 293mm MX70 87.3g 38.6g 97.0g 42.3g 295mm MX70 84.3g 38.0g 94.0g 41.7g 296mm MX60 87.1g 38.3g 96.6g 42.0g 295mm MX80 friend1 89.5g 39.9g 43.6g MX80 friend2 88.4g 38.9g 42.6g MX80 friend3 90.0g 40.1g 43.8g BS12 86.7g 37.8g 96.5g 41.2g 286mm SW30 85.1g 37.4g 94.8g 41.1g 292mm VT80 82.8g 38.7g 92.5g 42.4g 305mm VTZF 82.1g 38.6g 91.8g 42.3g 307mm VTZF friend 86.5g 40.4g 44.1g PrecisionPro1 86.9g 37.4g 96.2g 41.1g 289mm PrecisionPro2 87.2g 38.9g 96.5g 42.2g 294mm PrecisionPro3 88.0g 38.7g 97.4g 42.0g 292mm PrecisionPro4 87.6g 38.3g 96.9g 41.6g 291mm Revelation1 86.6g 37.1g 96.2g 40.4g 285mm Revelation2 88.0g 38.3g 97.3g 41.6g 291mm Revelation friend 87.9g 38.9g 42.6g RKEP Pro9000 85.5g 37.8g 95.2g 41.5g 292mm RKEP Pro9000 85.7g 37.7g 95.4g 41.4g 291mm RKEP XP70 84.2g 37.7g 93.5g 41.0g 293mm

Bare = no string, no overgrip
Playing = string and grip
Grip is RKEP Elite G09 white overgrip


As mentioned before, the white grip adds 0.7g,
VS850 and ZM67 adds 3.0g,
ZM65 adds 2.8g, and
ZM62 adds 2.6g to the head weight.

as mentioned at the very bottom of my first table on page 2, i did notice the corresponding changes to the head wt for each string and grip that i use.

so, yes, you can arrive at your bare specs that way

[visor]

but before you go doing this, you really should get a new digital scale that is accurate to 0.01g

[Maklike Tier]

I'll end up having quite a few scales in the house at this rate!

Are you sure your overgrip only weighs 0.7g? You mustn't overlap it at all.

[visor]

"As mentioned before, the white grip adds 0.7g,
VS850 and ZM67 adds 3.0g,
ZM65 adds 2.8g, and
ZM62 adds 2.6g to the head weight."



I should rephrase that paragraph better to:

	Total wt	Head wt contribution
White rkep g09 grip (no finishing tape)	6.1g	0.7g
VS850, ZM67 string	3.4g	3.0g
ZM65 string	3.2g	2.8g
ZM62 string	3.0g	2.6g

[Maklike Tier]

Yeah cool, heaps clearer *thumbs up*

[visor]

All are strung with BG66U @ 25lbs, and replacement gripped with Karakal PU Super.

#4- 87g / 305mm / 41g (My go-to racket)
#6- 91g / 300mm / 41g
#8- 90g / 305mm / 41g

I've added some athletic tape to the heads of all my rackets to bring them all up to 42g, just for fun -

#4- 89g / 308mm / 42g
#6- 93g / 303mm / 42g
#8- 91g / 310mm / 42g

@Maklike Tier

I tried to calculate your dry specs but there must be some error in your measurement for your #4 without athletic tape... it doesn't check out with the head wt equation.

For the others, it's fine.
But seriously, you need to spend only $25 to get a more accurate 200g+/-0.01g digital scale from eBay.

Wet wt	Wet head wt	-grip-string=Dry wt	-grip-string=Dry head wt
91	41	91-6-3=82	41-0.7-2.8=37.5
90	41	90-6-3=81	41-0.7-2.8=37.5

Those estimated wts are only rough estimates, as I would need original data with 3 significant digits.

PS. Looks like a 4U XP70 or 80 would be perfect for you.

[decoy]

In that table the mx 80's came out heavier than both the voltrics. How is that? That mustn't have been dry head weight then right?

[visor]

In that table the mx 80's came out heavier than both the voltrics. How is that? That mustn't have been dry head weight then right?

yeah... 2 of those vt's are 4u's while the mx80 is 3u

and even then those 2 vt's have higher head wt than the mx80