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  1. #1
    Senior Member nacra533's Avatar
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    Diamond tarp review

    Diy 1.1 sil diamond tarp
    11' RL 87" wide -slight asym diamond
    gross grain bound edges.
    No seams.
    1" "cat" cut per short side
    1.5" cat cut per long side.
    Cat cuts were not true. I just used a batten to put a slight concave to ensure that it was not convex and floppy.
    corners reinforced with 2 layers 1.1 calendared walmart ripstop

    This past weekend, I was in a thunderstorm. To call it a "deluge" would be like calling the grand canyon "a little crack.". HEAVY rain and 30kt gusts for well over one hour and localized flooding.

    I stayed dry under the tarp while my family got wet in my "foul weather" 2 man tent. Rain was splashing up under the tent fly and driving in any gap in the coverage. The only moisture I experienced under the tarp was the "mist" of the rain driving through the sil. more like a fog. Pulling my bug net over me stopped that. I had it pitched at my hammock ridgeline and the sides pulled down pretty tight. I also laid in line with my ridgeline instead of on the diagonal. The wind kept one side of the tarp pushed against me for at least an hour.

    I was car camping at a sail club and had several options to get dry, including several friend's RVs and the clubhouse. I fully expected to get wet but wanted to test the tarp when I had a safety net. My concerns were my feet and head are barely covered when in the diagonal and assumed a blowing rain would wet me. It turns out minimal coverage is sufficient.

    Overall, I was very pleased with the performance as compared to ease of setup and size. It will be my 3 season tarp in the future. I'm in GA, so my 3 season is warm compared to others. I have a 10x11 sq tarp I use normally. My only dislike is the size and 4 guy outs instead of 2.

  2. #2
    Senior Member Lonely Raven's Avatar
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    How do you have no seams on an 87" wide diamond?

  3. #3
    Senior Member nacra533's Avatar
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    Quote Originally Posted by Lonely Raven View Post
    How do you have no seams on an 87" wide diamond?
    -I started with a long piece of sil 62" wide.
    -I measured 11ft from one corner to the opposite side, creating the opposite corner.
    -I marked the centerline on the 11' diag
    -I set my tape measure at 87" and angled it the opposite direction (not quite perpendicular) until the 0 and 87" marks were on each edge.
    -I then slid the angled tape to center mark.
    Cuts are from 0 to 0 and 11' to 87" marks.
    It ends up slightly asym.

  4. #4
    PapaSmurf's Avatar
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    Quote Originally Posted by nacra533 View Post
    -I started with a long piece of sil 62" wide.
    -I measured 11ft from one corner to the opposite side, creating the opposite corner.
    -I marked the centerline on the 11' diag
    -I set my tape measure at 87" and angled it the opposite direction (not quite perpendicular) until the 0 and 87" marks were on each edge.
    -I then slid the angled tape to center mark.
    Cuts are from 0 to 0 and 11' to 87" marks.
    It ends up slightly asym.
    Huh???????????

  5. #5
    MacEntyre's Avatar
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    Quote Originally Posted by PapaSmurf View Post
    Huh???????????
    He cut a slightly asym diamond from a rectangular piece of cloth. The ridgeline is the diagonal of the rectangle. His waste was two triangular pieces.
    "We must, indeed, all hang together or, most assuredly, we shall all hang separately." - Ben Franklin
    www.MollyMacGear.com

  6. #6

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    PSmurf,
    I believe he measured a 11' diagonal and marked its midpoint on the 62 inch material, then he measured an 87" diagonal going the other way that was also centered on the first midpoint. That left a wedge at each end of the 62" fabric that needed to be removed to make the parallelogram from the original rectangle.

    Just my guess. I'm open to correction.

    Edited to add that Mac said it better.
    Last edited by heyyou; 08-23-2010 at 12:34. Reason: Mac beat me to the answer.

  7. #7
    PapaSmurf's Avatar
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    Like this? OK it finally sunk in.
    We are all born ignorant, but one must work hard to remain stupid. ~Benjamin Franklin


  8. #8
    Senior Member 1022's Avatar
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    How manyt yards of Silylon

    So this design requires 3.6 yards of silnylon to make (round up to 4 because stuff happens, and most places make you order in whole yard increments)

    This is based on the 11' (132") diagonal ridgeline, and the 62" wide material. If you treat those as the sides of a right triangle and solve for the missing side, it should be the length of uncut silnylon required 116.5 " (3.24 yards)


    I'd really love to see one pitched tight, to know if the "slightly loose rigeline" would bother me at all... another benifit of having no rigeline-seam
    ( beyond ease of construction and seam sealing) is the weight...


    Quote Originally Posted by heyyou View Post
    PSmurf,
    I believe he measured a 11' diagonal and marked its midpoint on the 62 inch material, then he measured an 87" diagonal going the other way that was also centered on the first midpoint. That left a wedge at each end of the 62" fabric that needed to be removed to make the parallelogram from the original rectangle.

    Just my guess. I'm open to correction.

    Edited to add that Mac said it better.
    Attached Files Attached Files
    Last edited by 1022; 09-01-2010 at 13:12.

  9. #9
    Senior Member eflat7's Avatar
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    Wow. good design. IMO. Might have to try this.

  10. #10
    Senior Member eflat7's Avatar
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    I am seriously thinking of making one of these. Can you please post a pic of the finished product?

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