how thick is thin

Discussion in 'The Watering Hole' started by watermelonman, Dec 13, 2019.

Help Support The Rocketry Forum by donating:

  1. Dec 13, 2019 #1

    watermelonman

    watermelonman

    watermelonman

    Well-Known Member

    Joined:
    Sep 22, 2014
    Messages:
    2,561
    Likes Received:
    1
    Who has stuck the calipers to modern fiberglass tubing? It looks to me like "thin wall" tends to be 1.6mm or less, while "traditional" or "thick wall" tends to be over 2.0mm in thickness. Obviously that varies with tube diameter and I am only looking at 38-98mm here.

    I am not looking for a silver bullet or super precision, but it is nice to have an idea.
     
  2. Dec 13, 2019 #2

    Andrew_ASC

    Andrew_ASC

    Andrew_ASC

    UTC SEDS 2017 3rd/ SEDS 2018 1st

    Joined:
    Sep 22, 2017
    Messages:
    3,833
    Likes Received:
    492
    Gender:
    Male
    I learned the hard way to not sand a CF tube down to finger thickness once. So that’s how thin is too thin imo. Sheared a CF tube in flight once.
     
  3. Dec 13, 2019 #3

    caveduck

    caveduck

    caveduck

    semi old rocketeer

    Joined:
    Jun 6, 2011
    Messages:
    1,245
    Likes Received:
    78
    I actually measured a bunch of actual Wildman and Madcow tubes 29mm to 98mm for my OpenRocket parts database.

    Thin wall is usually about 0.040" (1.0mm) and regular is 0.055" to 0.067" (roughly 1.6mm) for sizes up to around 98mm diameter. Madcow 75mm thinwall - the largest they offer - is spec'd at 0.049" but I haven't verified that one by measurement. The standard tubes get thicker above 98mm, the largest sizes hit 0.095" wall per the manufacturer.
     
    Last edited: Dec 13, 2019
  4. Dec 13, 2019 #4

    neil_w

    neil_w

    neil_w

    "The hex lug nut cut the mustard" TRF Supporter

    Joined:
    Jul 14, 2015
    Messages:
    7,073
    Likes Received:
    1,205
    Location:
    Northern NJ
    I misread the thread title as "how thick is skin" and clicked the link with great trepidation. I was quite relieved. :)
     
    Greg Furtman and Mugs914 like this.
  5. Dec 13, 2019 #5

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

    Joined:
    Sep 29, 2011
    Messages:
    2,538
    Likes Received:
    528
    Gender:
    Male
    Location:
    Howard, NY
    Neil, are we secretly one person? I opened the thread, not with trepidation, but with curiosity regarding what if anything skin has to do with rocketry. This is the watering hole, so it could have been about anything.
     
    Greg Furtman and neil_w like this.
  6. Dec 17, 2019 #6

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    1,294
    Likes Received:
    387
    I thought it was going to be another cooking thread. Wait...that seems really creepy now.
     
    neil_w likes this.
  7. Dec 17, 2019 #7

    dr wogz

    dr wogz

    dr wogz

    Fly caster

    Joined:
    Feb 5, 2009
    Messages:
    4,944
    Likes Received:
    399
    Location:
    Land of Poutine!
    I remember when I first got a dial caliper.. measured everything! Hated using a vernier caliper..

    Blond hairs are thinner than red, which are thinner than brunets...

    And a machinist told me why he has a pack of cigarette / rolling paper at his station: a piece of cigarette paper is 0.001". He places it on his piece, and then uses it to zero his cutting head..
     
  8. Dec 17, 2019 #8

    watheyak

    watheyak

    watheyak

    Barnstormer

    Joined:
    May 11, 2009
    Messages:
    604
    Likes Received:
    113
    Location:
    Arizona
    OK I'll bite. What is "finger thickness"?
     
  9. Dec 17, 2019 #9

    Andrew_ASC

    Andrew_ASC

    Andrew_ASC

    UTC SEDS 2017 3rd/ SEDS 2018 1st

    Joined:
    Sep 22, 2017
    Messages:
    3,833
    Likes Received:
    492
    Gender:
    Male
    Oh mybad it was like fingernail thin maybe a millimeter and half, yeah. Us university kids with no experience had this dumb idea to save mass. So we saved many many more millimeters off of thin wall tube. It wasn’t a good ending but we learned stuff.
     

Share This Page