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  1. #1
    Nhott's Avatar
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    May 2013
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    DangerBird overcover vent first impressions

    First off the specs.
    Order #862
    DangerBird
    Length: 10ft
    Layers: Single Layer
    Outside Fabric & Color: 1.8 Night Grid
    Suspension: Cinch Buckle
    Asym Lay: Right
    Ridgeline: 2pc w/split at foot end
    Extra Zipper Sliders
    Net: Left side
    Overcover: Left side
    Tie-outs
    Type: Upgrade to Pack Hooks
    Custom Work
    Description: Netting on last 12" of overcover

    So far so good on the overcover vent window. I received the DangerBird last Wednesday. I spent Wednesday (31 degrees), Thursday (40 degrees) in my garage, and last night at Antietam Shelter (mid 30's - low 40's). Thus far I have been able to keep the overcover fully zipped with no issues. The vent seems to be perfect. It is keeping in a considerable amount of heat. I woke up this morning half covered up thinking it was rather warm, unzipped it to stick my head out and I could feel a big temperature difference. I haven't had any condensation issues, perhaps it hasn't been cold enough out. I don't have any experience using an overcover other than this one so I really don't know, but it's working out great in this weather. I have never been more impressed with any cottage vender. I can't begin to say enough about PapaSmurf and MamaSmurf.


    Here are some pics that Randy took last week and some from this morning when we were packing up.
    "If you do not expect the unexpected you will not find it, for it is not to be reached by search or trail." - Heraclitus

  2. #2
    Senior Member Countrybois's Avatar
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    Jan 2014
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    East Central IL
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    Nice! That is a great idea! Keep us posted on its effectiveness.
    Countrybois

  3. #3
    Senior Member CamoEvo's Avatar
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    Apr 2013
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    Upper Peninsula, Michigan
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    Thanks for posting!

  4. #4
    PapaSmurf's Avatar
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    Fredericksburg, Ohio
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    Quote Originally Posted by Nhott View Post
    I think the trees that the brown hammock is using might be the exact same trees I used last time I hung at Antietam Shelter. It's a beautiful spot back there. Good news on the success of the vent so far.

  5. #5
    Senior Member
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    Sep 2013
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    Aspen, CO
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    Thats actually a really awesome idea for the overcover...

  6. #6
    Administrator Yukon's Avatar
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    Mar 2011
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    Cambridge, NY
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    Neat design, I like it. Doesn't seem like it would be difficult to block it off if you needed to as well...

  7. #7
    Senior Member AaronMB's Avatar
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    Aug 2011
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    Central California's Gateway to the Sierras
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    That's slick. Thanks for the highlights and the great pics. Is there a net that can be swapped out?

    ...I'll have to head over to Dream Hammock and check out the options.

  8. #8
    PapaSmurf's Avatar
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    Quote Originally Posted by AaronMB View Post
    Is there a net that can be swapped out?
    The DangerBird hammock comes with both net and overcover attached to the hammock and you choose which one you'd use.
    See this page for the details.


  9. #9
    Nhott's Avatar
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    May 2013
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    DangerBird overcover vent first impressions

    I did some research before contacting Randy about the overcover which was literally last minute. I'm not the first to try this but I couldn't find any info about it on the forums. Randy informed me that he has done it a couple of times with some success.

    This started out for the plain and simple reasoning of having an overcover and not zipping it up the entire way bothered me. Call it an anal retentive spell if you will. The vent is an experiment and I am not an engineer, just average intelligence. Having said that..

    I researched the effects of a screen vs an open vent using natural ventilation and came across a study on greenhouses. Yes I know a greenhouse isn't a hammock but it got me thinking. The study showed that a screened opening (intake and exhaust) cut air velocity down while increasing heat and adding a more gradual internal temperature rise. Without screens the temp just inside the opening matched the outside temp. It also created a more dispersed air flow pattern.

    Thinking about differential pressure, if the same holds true in the hammock then roughly at the point of the opening is where the internal and external temperature/moisture level out and this is where the moisture will collect. I know the hammock and overcover are both breathable but I never looked into air flow distribution specifics so here is where more guesswork comes in. By adding the mesh window on the overcover, air flow decreases but the hope is like in the case of the greenhouse that internal air mixing increases while trapping heat and eventually drawing the hot air and moisture up through the mesh before equaling out and condensing.

    I'll keep testing it in different conditions and see what the limitations are.
    Last edited by Nhott; 04-21-2014 at 13:36.
    "If you do not expect the unexpected you will not find it, for it is not to be reached by search or trail." - Heraclitus

  10. #10
    Senior Member Crowell392's Avatar
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    That is a very similar idea that I wanted to do on my warbonnet XLC

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