Page 1 of 3 123 LastLast
Results 1 to 10 of 24
  1. #1
    Knotty's Avatar
    Join Date
    Mar 2009
    Location
    Denville, NJ, USA
    Hammock
    DIY Stretch-Side
    Tarp
    DIY Cat Cut Hex
    Insulation
    Phoenix and Nest
    Suspension
    cinch buckles
    Posts
    4,448
    Images
    227

    Exclamation Samson Ropes Provides Whoopie Sling Info

    I wrote to Samson Ropes about Amsteel whoopie slings asking where they would fail. Here is their response.


    Using Amsteel Blue whoopie slings for suspending hammocks is a very interesting application. Thanks for the link to the thread on the hammock forum, it's a good discussion.

    Recently the reduction to 60% of average break strength for Amsteel Blue whoopie slings was suspected to be a low value. Testing showed that it is actually around 80% depending on the size of the rope. On every test done the break location was at the point of the adjustable whoopie tail exit.

    In collusion, the locking brummel has less impact on break strength reduction than the "sudden transition in size where the adjustable section exits the bury". If a traditional buried eye replaced the brummel, the same strength reduction would be expected because the adjustable bury exit is the weakest link.


    Best regards,

    Mark Pederson
    R&D Engineer


    Samson: The Strongest Name in Rope
    www.samsonrope.com
    Knotty
    "Don't speak unless it improves the silence." -proverb
    DIY Gathered End Hammock
    DIY Stretch-Side Hammock
    Stretch-Side "Knotty Mod"
    DIY Bugnet

  2. #2
    Senior Member Albert Skye's Avatar
    Join Date
    Jun 2009
    Location
    coastal B.C.
    Hammock
    DIY (&c.)
    Posts
    378
    Good work, thanks!

    Please convince them to do some D:d testing (because that data is fundamentally useful); ideally, a plot like this. When I requested that data they said they didn't have it, but perhaps you can talk them into doing it.

  3. #3
    gargoyle's Avatar
    Join Date
    May 2009
    Location
    Middleville, Mi
    Hammock
    G-Bird II
    Tarp
    Ogee tarp
    Insulation
    AHE TQ DIY Down UQ
    Suspension
    whoop dutch!
    Posts
    6,091
    Images
    46
    thanks knotty good info.
    Ambulo tua ambulo.

  4. #4
    Senior Member
    Formerly 'TroutEhCuss'
    Trout's Avatar
    Join Date
    Nov 2009
    Location
    Elkhart County, Indiana
    Hammock
    12' DIY 1.9 Ripstop Grn/HamMike RL
    Tarp
    12'x11' DIY Navy
    Insulation
    3/4 UQ Crowsnest
    Suspension
    Webbing & Buckle
    Posts
    1,195
    Images
    1
    I have no idea what he said.

  5. #5
    Senior Member opie's Avatar
    Join Date
    Mar 2009
    Location
    Lansing, MI
    Hammock
    Grizz Bridge
    Tarp
    Etowah, gargoyle
    Insulation
    Wool, heater
    Suspension
    Varies
    Posts
    3,140
    Thanks Knotty.
    I am not a gram weenie. , But Im starting to see the merits!!!

    Kris' Splicing

    Kris on Facebook

  6. #6
    Senior Member TeeDee's Avatar
    Join Date
    Jan 2007
    Location
    Maryland
    Hammock
    DIY Bridge
    Tarp
    DIY 10'x11'
    Suspension
    Whoopie Slings
    Posts
    1,631
    Images
    300
    Knotty - thanks for the information. Now we have some actual testers information.
    Those who sacrifice freedom for safety, have neither.

    Do not dig your grave with your teeth. (Unknown)

  7. #7
    Rat's Avatar
    Join Date
    Oct 2006
    Location
    Bertram, Texas
    Hammock
    DIY 126 x 60 Tablecloth
    Tarp
    JRB 10 x 11
    Insulation
    MMG IX Universal
    Suspension
    Whoopie
    Posts
    1,101
    Images
    22
    Quote Originally Posted by Knotty View Post
    Recently the reduction to 60% of average break strength for Amsteel Blue whoopie slings was suspected to be a low value. Testing showed that it is actually around 80% depending on the size of the rope. On every test done the break location was at the point of the adjustable whoopie tail exit. Best regards,

    Mark Pederson
    R&D Engineer


    Samson: The Strongest Name in Rope
    www.samsonrope.com
    So, basically, the point of failure of Amsteel Blue when used in Whoopie Sling configuration is 80% of it average breaking strength; or, a 20% reduction in the average breaking strength.

    So at 1,600 pounds Average breaking strength (for 7/64 diameter rope), the Whoopie factor makes this 1,280 pounds; or, using the Minimum strength of 1,400 pounds the Whoopie factor makes this 1,120 pounds.

    That's the extent of my math!
    "I aim to misbehave." - Capt. Mal Reynolds
    Mind of a Rat Youtube Channel

  8. #8
    in it for the naps oldgringo's Avatar
    Join Date
    Aug 2009
    Location
    Checotah, Oklahoma
    Hammock
    Varies
    Tarp
    GargoyleGear Ogee
    Insulation
    UQ-varies w/season
    Suspension
    onrope buckle
    Posts
    5,982
    Quote Originally Posted by Hogn8r View Post

    That's the extent of my math!
    I'm sure Gage can help you out.
    Dave

    http://www.uark.edu/misc/xtimber/rna/pattonsbluff.html

    It has always been my private conviction that any man who pits his intelligence against a fish and loses has it coming.
    John Steinbeck

  9. #9
    Knotty's Avatar
    Join Date
    Mar 2009
    Location
    Denville, NJ, USA
    Hammock
    DIY Stretch-Side
    Tarp
    DIY Cat Cut Hex
    Insulation
    Phoenix and Nest
    Suspension
    cinch buckles
    Posts
    4,448
    Images
    227
    Quote Originally Posted by TroutEhCuss View Post
    I have no idea what he said.
    Bottom line is that a whoopie will break where the adjustable tail exits the bury.


    I guess we don't need the question mark anymore.
    Knotty
    "Don't speak unless it improves the silence." -proverb
    DIY Gathered End Hammock
    DIY Stretch-Side Hammock
    Stretch-Side "Knotty Mod"
    DIY Bugnet

  10. #10
    sclittlefield's Avatar
    Join Date
    Sep 2008
    Location
    Northern woods of Maine
    Hammock
    It's a Secret.
    Tarp
    BWDD Winter Dream
    Insulation
    Crowsnest
    Suspension
    Slings
    Posts
    1,435
    Images
    95
    Thanks so much for forwarding the email along Knotty! I think I can live with 80% of the original strength.
    DIY Gear Supply - Your source for DIY outdoor gear.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •