42 replies to this topic

[NightKnight]

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

Attached Files

•  theraband chart.JPG   89.91K   1997 downloads
•  theraband graph.JPG   61.51K   1159 downloads

[p4v_singh]

how would i conect thera bands to a barnett black widow slingshot im an amatuer atm so any tips?

[NightKnight]

There are a few ways to do it. Here are a couple links to get you started. I am sure that some of the other guys will comment as well.


http://slingshotforu...ith-flat-bands/

[p4v_singh]

thanks and ive read that certian band will just slip on but some are to tight for it guna try and find out wich 1s

[faca]

AaronC, on 18 December 2009 - 12:39 AM, said:

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

which is the width of hand for these charts?

[NightKnight]

faca, on 31 December 2009 - 01:58 AM, said:

AaronC, on 18 December 2009 - 12:39 AM, said:

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

which is the width of hand for these charts?

I am not sure I understand. Are you asking for the thickness of the bands? If so, here are the only specs that they offer:
Tubes
Tan .062 ID x .031 wall
Yellow .200 ID x .045 wall
Red .200 ID x .057 wall
Green .200 ID x .069 wall
Blue .200 ID x .085 wall
Black .200 ID x .098 wall
Silver .200 ID x .125 wall

Bands
Tan/Extra Thin
Yellow/Thin
Red/Medium
Green/Heavy
Blue/Extra Heavy
Black/Spcl Heavy
Silver /Spr Heavy
Gold/Max

[faca]

AaronC, on 31 December 2009 - 09:32 AM, said:

faca, on 31 December 2009 - 01:58 AM, said:

AaronC, on 18 December 2009 - 12:39 AM, said:

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

which is the width of hand for these charts?

I am not sure I understand. Are you asking for the thickness of the bands? If so, here are the only specs that they offer:
Tubes
Tan .062 ID x .031 wall
Yellow .200 ID x .045 wall
Red .200 ID x .057 wall
Green .200 ID x .069 wall
Blue .200 ID x .085 wall
Black .200 ID x .098 wall
Silver .200 ID x .125 wall

Bands
Tan/Extra Thin
Yellow/Thin
Red/Medium
Green/Heavy
Blue/Extra Heavy
Black/Spcl Heavy
Silver /Spr Heavy
Gold/Max

hi sorry not to be clear.
I mean if chats datas are for commercial Thera-bands of x? centimetres wide no thickness
enjoy

[wvbob]

faca, on 01 January 2010 - 02:21 AM, said:

AaronC, on 31 December 2009 - 09:32 AM, said:

faca, on 31 December 2009 - 01:58 AM, said:

AaronC, on 18 December 2009 - 12:39 AM, said:

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

which is the width of hand for these charts?

I am not sure I understand. Are you asking for the thickness of the bands? If so, here are the only specs that they offer:
Tubes
Tan .062 ID x .031 wall
Yellow .200 ID x .045 wall
Red .200 ID x .057 wall
Green .200 ID x .069 wall
Blue .200 ID x .085 wall
Black .200 ID x .098 wall
Silver .200 ID x .125 wall

Bands
Tan/Extra Thin
Yellow/Thin
Red/Medium
Green/Heavy
Blue/Extra Heavy
Black/Spcl Heavy
Silver /Spr Heavy
Gold/Max

hi sorry not to be clear.
I mean if chats datas are for commercial Thera-bands of x? centimetres wide no thickness
enjoy

Since Theraband is used for excercise they have to be talking about the width the band comes in. I don't think they have slingshots in mind.

[ZDP-189]

Some interesting stats...

Thera-band specs:

• Gold; .025" thickness; 11.8 lbs at 100% elongation
• Silver; .022" thickness; 8.6 lbs at 100% elongation
• Black; .015" thickness; 4.9 lbs at 100% elongation
• Blue; .012" thickness; 4.5 lbs at 100% elongation
• Green; .010" thickness; 3.1 lbs at 100% elongation
• Red; .008" thickness; 2.7 lbs at 100% elongation
• Yellow; .006" thickness; 1.8 lbs at 100% elongation
• Tan; .004" thickness; 1.1 lbs at 100% elongation

Sources (same):

• http://www.yogadirec...hera_bands.html
• http://www.yogaacces...lls_c_1045.html

I presume the elongation refers to full 6" width by 12" elongated to 24" lengthwise, but maybe it refers to full length.

Interestingly, thicker bands seem to require more force per thickness to reach 100% elongation.

[ZDP-189]

Incidentally, when I measured Thera-band gold with a micrometer myself, I got .0295" and Thera-band Silver gave .0216".

The manufacturer's specs for the bands I can buy locally (approx. 4'x6"):

XF1065; Blue; 0.65mm/.0256"; 4.5kg
XF1050; Red; 0.50mm/.0197"; 3.5kg
XF1035; Yellow; 0.35mm/.0138"; 2.5kg

Their definition of draw force must be different.

XF1065 pulls between TB Gold and TB Silver
XF1050 pulls below TB Silver (probably abover TB Black, though I haven't tried it.)
XF1035 will likely be between TB Green and TB Black

The XF compound looks good. It stretches well and returns fast. It doesn't seem to last as well as Thera-band, but then I have only just discovered using a cutting mat and roll-cutter.

[Tex-Shooter]

All rubbers including Thera-band have tolerance specifications. Thera-band is a compound (latex+?) that is made by Hygienic, which has some of the tightest tolerance specifications in the rubber Industry. -- Tex

[ZDP-189]

I was looking at the relationship between thickness and the amount of traction force required for elongation. I expected to see a nice relationship with yellow at one extreme, gold at the other and the others lying proportionally along the curve.

That's not what I found.

Yellow: 967 lbs/inch thickness @250% elongation
Red: 875 lbs/inch thickness @250% elongation
Green: 960 lbs/inch thickness @250% elongation
Blue: 1,108 lbs/inch thickness @250% elongation
Black: 1,173 lbs/inch thickness @250% elongation
Silver: 1,150 lbs/inch thickness @250% elongation
Gold: 1,604 lbs/inch thickness @250% elongation

Source: Force numbers from Aaron's table; thickness from Thera-band.

It raises the possibility that either the inputs are wrong or Thera-band are using different compounds for different colours.

[boyntonstu]

AaronC, on 18 December 2009 - 12:39 AM, said:

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

The charts are half of what we need.

We need the 500% information. (Perhaps 600% too)

Joerg uses 470%.

[Sam]

AaronC, on 18 December 2009 - 12:39 AM, said:

This is a nice chart to help choose what band will fit your needs best. I also threw the data into Excel to get a graph.

Also, here is a note from Thera-Band:

Quote

Using the “force elongation” chart, you can predict what the force will be at a specific percent elongation for Thera-Band colors. For example, if your 2 foot length of band was Red, then when you stretched it to 4 feet (100% elongation), you’d have about 3.9 pounds of force.

Both Thera-Band resistance tubing and bands are calibrated to offer the same resistance levels at the same percent elongation.

How wide are the sections of Theraband they tested?

[ZDP-189]

boyntonstu, on 23 July 2010 - 07:51 AM, said:

The charts are half of what we need.

We need the 500% information. (Perhaps 600% too)

Joerg uses 470%.

I recommend buying the bands, testing them and publish your results. Thanks in advance!

[Sam]

ZDP-189, on 04 June 2010 - 04:05 AM, said:

I was looking at the relationship between thickness and the amount of traction force required for elongation. I expected to see a nice relationship with yellow at one extreme, gold at the other and the others lying proportionally along the curve.

That's not what I found.

Yellow: 967 lbs/inch thickness @250% elongation
Red: 875 lbs/inch thickness @250% elongation
Green: 960 lbs/inch thickness @250% elongation
Blue: 1,108 lbs/inch thickness @250% elongation
Black: 1,173 lbs/inch thickness @250% elongation
Silver: 1,150 lbs/inch thickness @250% elongation
Gold: 1,604 lbs/inch thickness @250% elongation

Source: Force numbers from Aaron's table; thickness from Thera-band.

It raises the possibility that either the inputs are wrong or Thera-band are using different compounds for different colours.

Hmmm, interesting obviously the unnatural colours would make a small difference to each colour's composition - I discovered a similar notion recently when looking at monofilament lines (for fishing,) I realised that the lines which had been deliberately coloured were slightly weaker than those that hadn't, as part of their construction was the colour itself...

[ZDP-189]

The guys at Balloonbed only sell red ones for that reason.

[ZDP-189]

BTW when you do your 500% charts, you'll need to test the force-contraction curves as well as the force-elongation curves and also measure the velocity of the bands to test the band efficiency you wrote of earlier. I think you'll get some interesting and revealing results past 350%.

[Sam]

ZDP-189, on 23 July 2010 - 09:11 AM, said:

The guys at Balloonbed only sell red ones for that reason.

I thought a sort of creamy, yellowish white was the natural colour of latex? I think the differences in draw-weight may be because the different colours require different amounts of colour in order to achieve the desired colour - if that makes sense!

[boyntonstu]

ZDP-189, on 23 July 2010 - 09:02 AM, said:

boyntonstu, on 23 July 2010 - 07:51 AM, said:

The charts are half of what we need.

We need the 500% information. (Perhaps 600% too)

Joerg uses 470%.

I recommend buying the bands, testing them and publish your results. Thanks in advance!

Does anyone on this forum draw less than 250%?

FYI I just shot a 5.2 g marble using single red TB tube at 166 fps with a 400% draw at about 15 pounds of draw.

Using double tubes the marble goes over 200 fps.

[Sam]

ZDP-189, on 23 July 2010 - 09:16 AM, said:

BTW when you do your 500% charts, you'll need to test the force-contraction curves as well as the force-elongation curves and also measure the velocity of the bands to test the band efficiency you wrote of earlier. I think you'll get some interesting and revealing results past 350%.

I agree, I look forward to seeing the results!

[919h]

Most of us using the “force elongation” 1000mm or 39.37”

The band slingshot is arount 200mm or 8”

Also

For 100% elongation band , we have 200mm + 200mm = 400mm or 16”

For 200% elongation band , we have 200mm + 400mm = 600mm or 24”

For 300% elongation band , we have 200mm + 600mm = 800mm or 31”

For 400% elongation band , we have 200mm + 800mm = 1000mm or 39”

For 500% elongation band , we have 200mm + 1000mm = 1200mm or 47”

So what interest to us is the extension to 400%

I’m on a right or wrong way ?

Excuse me for my bad english

@+

Thomas

[ZDP-189]

Sorry, the relationship is not linear. There are example force elongation and force contraction curves in my blog.

[PandaMan]

i don't know which thera band to use... I remember when I was 9 I tried archery and I could do it ok with an adult's bow, which surely has a strong draw weight... I think maybe black or silver, which do you guys think?

[ZDP-189]

I would start out with a medium weight band and decide whether you need more energy when shooting larger projectiles.