Stringbed frequency to monitor string tension

[msitpro]

Yes, and that's the wonder of super thin strings.

Your original post lists these results:

ZM62, 23x24 lbs, 1135 Hz, 2 weeks
ZM62, 22x23 lbs, 1105 Hz, 3 weeks
ZM62, 22x23 lbs, 1100 Hz, 3 weeks
ZM62, 22x23 lbs, 1085 Hz, 6 weeks
ZM65, 20x21 lbs, 1020 Hz, 2 weeks
ZM65, 19x20 lbs, 1000 Hz, 6 weeks

So, 100 Hz lost in 3 weeks??!!!

Kwun's chart and results suggests approx 26lbs as well, and that's with ZM62 being used.

Were they measured on the same make and string pattern of racquet? Just seems too high. I would expect somewhere around 1140 - 1170 freshly strung looking at others' results.

[Mark A]

Mark, did you ever get a reading for ZM62 @ 30x31 ?

Yes: fresh out of the machine... 1366 Hz.

Another one for the pot:

Adidas Power Hybrid:

0	1284
1	1274	0.78
3	1263	1.64
6	1257	2.10
12	1249	2.73
24	1241	3.35
48	1234	3.89
72	1230	4.21
1st session	1210	5.76

[visor]

As a reference, my ZM62 @22x23 lbs ECP :
0hr = 1212 Hz

This is xp70 #2 by stringer b.
After 2 wks and 6hrs play it has dropped to 1155 Hz.

[visor]

Of those rackets with zm62 @22x23 lbs in my op, they were strung by stringer A. Iirc at 0h they were around 1180 Hz.

[visor]

The *stabilized* stringbed frequencies I get do match perfectly with kwun's graph on page 1 for a single string of zm62. Note stabilized after a few days, not immediately off the machine.

So I'd expect Mark's 31 lbs to stabilize around 1300.

[blableblibloblu]

Yes: fresh out of the machine... 1366 Hz.

Another one for the pot:

Adidas Power Hybrid:

0	1284
1	1274	0.78
3	1263	1.64
6	1257	2.10
12	1249	2.73
24	1241	3.35
48	1234	3.89
72	1230	4.21
1st session	1210	5.76

Your power hybrid frequencies are pretty much what I also get.
I strung my MXJJS and SW35 at 30 lbs and theyre staying at 1200 after about 3 sessions

[Mark A]

The *stabilized* stringbed frequencies I get do match perfectly with kwun's graph on page 1 for a single string of zm62. Note stabilized after a few days, not immediately off the machine.

So I'd expect Mark's 31 lbs to stabilize around 1300.

Well...

0	1366
1	1352
3	1343
6	1334
12	1322
24	1313
48	BROKE

Yep - it broke before I even got the chance to play with it. I suspect two things:

1. It was Z62 Mk1 - I was after Mk2,
2. There was a nick in the string - it's happened before, especially with Ashaway.

I don't know how or why it lasted two days, though.

[visor]

Lol... I think 31lbs has totally exceeded ZM62's elastic limit.

[blableblibloblu]

Hmm it seems as if powerhybrid has good tension retention up until you play with it. Dropped all the way down to 1170 hz.

But then again, when I string ZM70 in the low 30's, I really don't see the tension retention everyone talks about as it seems to drop a lot. I guess it's something you have to live with when you string it over 28 lbs?

Makes me want to try thinner strings at lower tensions

[visor]

Update of my most recent zm62 @ 22x23 lbs:

1212Hz 0h
1180 24h rest
1155 6h play
1145 8h play
1135 10h play

[Mark A]

Hmm it seems as if powerhybrid has good tension retention up until you play with it. Dropped all the way down to 1170 hz.

But then again, when I string ZM70 in the low 30's, I really don't see the tension retention everyone talks about as it seems to drop a lot. I guess it's something you have to live with when you string it over 28 lbs?

Makes me want to try thinner strings at lower tensions

The percentage of tension loss seems to be the constant, so those of us who use 30+ are going to feel 3+ lb more than the low 20's crew feels 2 lb...

I really think rougher strings suffer from this sudden drop in play more than smooth ones do, though, and the Mk1 Z70 was pretty rough.