Duzza said:Help me out please, they show a different swingweight, unless the swingweight at 10cm is different?..
So I'll follow Steve's spreadsheet for this test and say it is 344 swingweight. Thanks, I noticed some of the figures go outside impossible too but that makes perfect sense. 5 grams pfft.Amone said:I do know one thing, and that is that your setup there is theoretically impossible; the racquet stops at 68.5, one of the weaknesses of my spreadsheets is that it allows that to come up.
Yes, I realised that there were disparities, though not that high. Perhaps there's something bigger wrong with mine, I'll need to get in touch with Steve H. or TravlerAjm about the swingweight formula for the original.
Andrew, if the 2 spreadsheets don't agree then it's impossible I've found. If you try to get too big a swingweight it may not work and Steves spread is pretty accurate(to about 0.03 off) so 2 things you can do: Lower the desired swingweight unfortunately, or mess around with the mass in location 1(the one in white) until both spreadsheets agreeandrew_b said:OK, help please? First, though, thanks for taking the time to provide this to the community! You've obviously put a bitof work into it, and you're not afraid to admit parts have discrepancies and to work to address them.
So, I played with it with my racket settings and a setup I'd like to try out:
weight: 340.48g
Balance: 32
Swingweight: 335
Final weight: 352.48
Final balance: 32
Final swingweight: 365
weight mass 1: 7
weight mass 2: 5
The above give me locations of (roughly) 14 and 57, which is OK.
I, too, get a pretty big difference in swingweight when I plug the starting values, weights, and locations into Steve's spreadsheet. It ends up saying the swingweight is 346.
Sorry I can't post the images like someone else did, don't know how to do that. Any idea why the swingweights are so different, or which one is closer?
Thanks,
Andrew
Thanks for replyingstules said:Hi Duzza
Hope you find it useful.
what is the quality index?
http://www.racquetresearch.com/complete_idiot.htm
Actually not... I measure the racauet and use the actual length in cm's and mms.
Two reason, to remove abut 13gm from the total weight, and hence give me more room to customise before coming up against my total weight barrier.ie, if the total weight is 343gm and my target total is 346, I can only add 3 gram to the racquet, not much of an adjustment. If I remove the grip, I now getabout 16 gram to add anywhere to achieve my atarget weight. Second reason is that I like the feel of the 'sharper edges of the handle with just an overgrip only. It feels to me easier to change grip positons. Personal preference. I buy a 4 5/8, then take off the grip, add an overgrip and have a 4 1/2 handle.
Fair enough, I just thought it would be a waste of time filling in the numbers of removing a grip and then putting it back on, with an overgrip only of course it makes sense.
And why does, with the balance if you have 12.5 inch balance equal 8.5 points? If its a standard 27 inch racquet surely the balance is (13.5-12.5)*8?
Easy answer, just adjust the Racquet lenght field to 69cm , if it is a 27" racquet. THat example is 68.58cm ie not 27". hence the discrepancy
What i mean is with Amones you can choose the desired swingweight, balance and then mix around with the 1st location of weight until you find places that work.
I find trial and error not too hard. I know how much weight I have to play with ie 330 starting weight, aiming for 346, I know I have to add 16 gm.
Preference is at least 6gm at 3/9 for stabilty, then I play with thel last 10 to get the total swingweight and balance, which is the juggle. Try it, not too time consuming.
Regards Stuart
Fair enough, I just thought it would be a waste of time filling in the numbers of removing a grip and then putting it back on, with an overgrip only of course it makes sense.stules said:Actually not... I measure the racauet and use the actual length in cm's and mms.
Two reason, to remove abut 13gm from the total weight, and hence give me more room to customise before coming up against my total weight barrier.ie, if the total weight is 343gm and my target total is 346, I can only add 3 gram to the racquet, not much of an adjustment. If I remove the grip, I now get about 16 gram to add anywhere to achieve my atarget weight. Second reason is that I like the feel of the 'sharper edges of the handle with just an overgrip only. It feels to me easier to change grip positons. Personal preference. I buy a 4 5/8, then take off the grip, add an overgrip and have a 4 1/2 handle.
stules said:And why does, with the balance if you have 12.5 inch balance equal 8.5 points? If its a standard 27 inch racquet surely the balance is (13.5-12.5)*8?
Easy answer, just adjust the Racquet lenght field to 69cm , if it is a 27" racquet. THat example is 68.58cm ie not 27". hence the discrepancy
Wouldn't it be 0.3175 then?stules said:0.3 is 3mm ie 1/8" ie 1 point
I'll look into the 27" equation. Get back to you on that.
Amone said:The fourth whited-out box in that section, labeled 'Weight 1 Mass,' you can enter just about any number lower than the total added mass in grams. If you're not sure how much mass you're adding the spreadsheet provides you with that piece of information. What this is, is the amount of weight to add at the first spot, or 'location 1.'
If either value for 'weight location' comes out as greater than the total length of your racquet, you need to modify your input 'Weight 1 Mass.'
Yes, we sometimes disagree, but it was just to improve our knowledgeIt didn't work anyways, Jace. I'm sorry. As much as we disagree, if you'd like I can get back to work on it for you. If you want the non-working version, then I could send it to you if you'd like. soulcutterx13@yahoo.com
EDIT: Never mind, I'm trying to fix it anyways. For a second there I sounded kinda pathetic! ^_^;
Yes, we sometimes disagree, but it was just to improve our knowledge
I'm also doing some kind of SW and other tennis tools spreadsheet, I was looking for some Trav's formulas (SGPR...). I'll post this tool next week. And maybe we'll merge our files?
Wish you the best for 2007
jace from Paris
Hi
I have taken a few of the formulas that have been on various threads lately,
and combined them into a more more useable format.
Thanks to all that contributed. Instructions are included particularly Travlerjm, Amone, and TonyB. Should be self explanetory.
I hope this helps............
download it here
http://www.badongo.com/file/1604939
You have to go to the bottom of the page, and read the instruction.
I figure you have Excell on your pc.
open the spreadsheet.
There is no need to copy the formula. Across the bottom of the page are 'tabs. I have inserted about 10 popular racquets there, with the specs off TW. click on the tab, and mod away to your hearts content.
When you wish to use a new racquet,
'right click' on any tab at the bottom of the page,
click 'copy sheet'
tick the sheet you wish to copy
'ok'
'right click' on the new tab and rename to the desired name.
The blue fields need to be filled out, ie if your racqet length is 69.5cm, you need to insert that number in the blue square.
Fill out the blue 'weight added' squares with grams of lead at a distance from the butt (both figures can be varied) but leave the space blank or with a '0' in it if you don't place lead there. Negative numbers work as well, eg if you trim down the grommets, weigh them before and after, and place the difference as a minus figure at the average distance from the butt where you trimmed.
TW's figures are close, but they are averages of that racquet, and not for your specific one. ie if you have a 4 5/8 grip it may be heavier, and slightly more head light. With this in mind I weigh the actual racquet I am modding, measure its actual balance point (with overgrip and dampener on) and check the SW using the pendulum method (as per the bottom of the spreadsheet) and then insert these figures into the start of the spreadsheet instead of TW's. Either way is reasonably close.
Please follow these instructions, and hopefully it will be reasonably self explanatory. If you have any difficulties, please say so, as you won't be the only one. I have tried to label everything on the spreadsheet to make it useable without complicated instructions.
PS, I don't think there are any mistakes, but caveat emptor...
Regards Stuart