Feder strength

We categorize our feder blades into three groups, based on the force that a feder generates while bending:

Light blade

The “light blade” is not for heavy sparring or tournament usage. It bends really well, but because of this flexibility, its durability is limited. We suggest that you should use it for light sparring or controlled practice. 

Warranty: 6 months

7 - 9,5 kg

(under 10 cm of bend)

Medium blade

The “medium blade” combines flexibility and durability therefore it’s the common choice for every day’s usage. Also that’s the upper limit for our “Trnava feders” because of weight distribution and for proper point of balance.

Warranty: 6 months

11,5 - 13 kg

(under 10 cm of bend)

Strong blade

The “strong blade” is for full speed trainings and tournaments. The blade still safe for full-strength trusts, but because of its high durability, it won’t let you down in the middle of your most important fight.

Warranty: 1 year

13,5 - 15 kg

(under 10 cm of bend)

How to measure the strength of A FEDER blade?

We had created a rather simple system in order to make our blades measurable basically anywhere. If you are at home, or at a tournament it doesn’t matter, you will only need a personal scale. There are two methods: the simple one that you will probably use, and a bit more advanced and accurate one, that we use at the manufactory to adjust the blades.

The simple method

It’s a simple, quick, mobile and pretty accurate method to determine that the blade is actually is what it’s said to be. What do you need? You will need a personal scale. After you got the scale, you need to place the feder on the scale vertically (you need to stabilize it with hand, but don’t use any kind of strength).

And here comes the muscle time: When the scale has zeroed in (zeroing in is very important, always measure from zero), you need to push down vertically the feder – bend it – until it pasts a point of resistance. You will feel this point, it’s a feeling when the blade is not fighting against you any more, just bending like a spring. This state usually can be achieved with 10cm pushing. When the blade is bended in the no resistance zone, your scale will measure a pretty fixed amount of weight. That will be the force of the blade or “FoB”

Caution: Please use some hard surface material or a piece of rubber to dissipate the puncture force of the feder’s tip to avoid damaging your scale.

Where can it go wrong?

  • you didn’t zero in your scale
  • you didn’t push vertically the feder
  • you didn’t push down enough the feder (10-12cm)
  • you pushed down too much the feder
  • there are thousand types of scales, it is possible that yours not calibrated like ours, but we still think the results will be within the margin of error most cases

These are the possibilities where you can make a mistake. We would advise, that always measure 3 times, just to be sure. It’ll take like one more minute, but it can filter out wrong results.

The advanced method

We’ve built a device, which works the same way as we mentioned above, but it extracts the human from the equation. Because of this, it became much less mobile, but we can get very accurate, repeated readings which is much more important for us than mobility.