I just got an mp100 and told the shop owner to string them at 24 cross and 22 vertical. and he got confused and asked why I want it that way and then said that the rackets the head coach of South-Sulawesi (Indonesia) told him to string all the rackets at 24c 24v. Can someone tell me what the ups and downs of these two varying ideas about tensions?

see
http://www.badmintonforum.com/forums/read.php?f=4&i=7907&t=7887

every stringers have their unique technique and machine. So, because one stringer can do it doesn't mean a different stringer repeat it exactly. Also, every mechanical machine will yield different results even when one specifc tension is asked.

why do ppl. have diff. string tension anyways?

suppose its just what they feel works best, and also the equipment on the machine used to measure tension isnt always accurate.

The different tensions is so that the average surface tension remains at 24lbs. When the mains are put in, the tension will be 24 lbs, since that is what is pulled. When the crosses are put in, if they are pulled at 24 lbs, the surface tension will actually increase (the mains string tension will increase due to the weaving). So in fact if you pull at say 22 lbs, the average surface tension should still remain near the 24 lb level.

Now that being said, it is doubtful that anyone really cares about average surface tension. Most people will just say string it at 'whatever tension(s)' because that is what they are used to. As a stringer we would simply string it to their request (unless the request may result in a damaged racquet).

The different tensions is so that the average surface tension remains at 24lbs. When the mains are put in, the tension will be 24 lbs, since that is what is pulled. When the crosses are put in, if they are pulled at 24 lbs, the surface tension will actually increase (the mains string tension will increase due to the weaving). So in fact if you pull at say 22 lbs, the average surface tension should still remain near the 24 lb level.

Now that being said, it is doubtful that anyone really cares about average surface tension. Most people will just say string it at 'whatever tension(s)' because that is what they are used to. As a stringer we would simply string it to their request (unless the request may result in a damaged racquet).

Beside the weaving requires the increase of cross's tension, the stringer's ability to keep the cross lines perfectly straight is also the reason to string the cross at a higher tension. The cross lines tension drop as them getting straighten out during play. It all depend on the stringer. All stringing machines does allow the tension be changed at any time.

If the single line method is used, the vertical and the cross may creeps toward equilibrium after prolonged use.

One should also keep in mind that the power comes from the vertical lines, while the cross lines provide support.