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custom wings for Nacra 5.5?  Bottom

  • I was looking to sell my N5.5 on this site, now having second thoughts...esp if I can configure a set of
    wings when hauling around friends or putzing around in light winds. Anyone have suggestions/specs on how to construct? Thanks.

    --
    eddiecat

    Nacra 5.0
    Hobie 16 (restored)
    Nacra 5.5
    --
  • wings are not good for light air sailing
    you wouldn't trap out in light air - same effect sitting outboard

    But traping out on a wing is fun!!!
    https://www.thebeachcats.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=131392&g2_serialNumber=3&g2_GALLERYSID=adccadf130584ee9dd35e2a30aa8a99b



    Edited by MN3 on Jun 02, 2020 - 09:36 AM.
  • If you can weld stainless, which is easier than aluminum I think you could use exhaust tubing (maybe) - and, the reason I bring up exhaust tubing is that you can buy pre-bent/mandrel bent pieces easily and would only need to weld together. There is then the issue as to whether that type of stainless would actually survive the corrosive environment. Aluminum piping is even better, but you'd need to be able to bend and weld, then paint it.

    --
    Chuck C.
    H21SE 408
    --
  • Looks like fun MN3, you got a big ol grin going on there. Yeah would use wings for just sitting around on in light winds, definitely want to get used to trapping out, way out.
    Hadn’t thought of exhaust pipe- good idea got a buddy with a welder setup will look into it, and post pics if we able to complete that as a self- quarantine project

    --
    eddiecat

    Nacra 5.0
    Hobie 16 (restored)
    Nacra 5.5
    --
  • That is my friend Zack -

    my comment on steel is :

    it is 2.5x the weight of alum and from my my quick research is not as easy to bend without the steel failing. not a fabricator so not sure if any of that is an issue.

    there are reasons our cats have alum masts, beams, and other parts - weight savings
    my custom wings are probably 15 to 20 lbs each
    so 40 lbs righting movement 80% of it aft of the CE = performance hit in light air
  • Yup, but that stainless tube is thin and derives it's strength from the diameter more than the wall thickness. Probably isn't much different in weight-but, only a 50/50 chance of working, since the alloy isn't 316 and likely to corrode. I don't know.

    --
    Chuck C.
    H21SE 408
    --
  • i always try to at least be aware of worst case scenario and hope for the best:

    so lets assume 2 people weight a total of 350 lbs are sitting on the wings and get caught in heavy air and med waves. the forces being exerted on the frames that hold the seats out is pretty extreme (i bet they are at least doubled when slamming off a wave) - ya think thin walled exhaust pipe is gonna support 700lbs of bouncing weight?

    and what is the cost of failure in this situation? 2 people dumped off a wingset, hanging on to sheets to stay with a boat in heavy weather, with razor sharp steel somewhere ...

    ymmv



    Edited by MN3 on Jun 05, 2020 - 09:03 AM.
  • Easy-pull up the engineering stats for each tubing (aluminum and stainless) and compare. You want to match and that same sheet will tell you the weight per foot. It doesn't add up, don't use it. Simple, no calculations needed. Just compare shear strength and deformation properties, like in an I-beam. If you run a risk of shearing aluminum or steel at the same value, you don't want either if you're worried about injury.

    Very valid point, BTW. I guess I shouldn't assume anyone would take the same tact and bother with the numbers.

    --
    Chuck C.
    H21SE 408
    --
  • Don’t underestimate the fun factor of trapping off wings, but don’t ignore the dangers either.
    I had a 6 meter Mystere XL, 20’ x 10’, with wings from a Hobie 21 that were modified for the Mystere. They made the boat 14’ wide.
    With my paltry 172 lb, fully powered, solo I could just keep the hull in the water in 7mph wind. When that hull comes up, you are suddenly looking at a looonnng fall if things don’t go quite right.
    Not only do you fall a good distance, but the opposite board might be partially up, or you hit the opposite wing, the potential for serious injury are real.
    My buddy crashed this boat, I broke my ankle, either in the board or wing, not sure.
    The company medical department made me take 8 weeks off, from July 1- Sept 4. It wasn’t all bad, they gave me full pay, & I got a plastic cast, so I could go back in the water. Had to give up the stick shift for the summer.
    http:// https://www.thebe…53b0742f4247cfd0cc910765



    Edited by Edchris177 on Jun 06, 2020 - 09:55 PM.

    --
    Hobie 18 Magnum
    Dart 15
    Mystere 6.0XL Sold Was a handful solo
    Nacra 5.7
    Nacra 5.0
    Bombardier Invitation (Now officially DEAD)
    Various other Dock cluttering WaterCrap
    --
  • Dammit! Can anyone tell me how to post a photo from an iPad?
    I don’t see the “copy image location” in either Firefox or Safari. If I copy the URL, it doesn’t like that either.

    --
    Hobie 18 Magnum
    Dart 15
    Mystere 6.0XL Sold Was a handful solo
    Nacra 5.7
    Nacra 5.0
    Bombardier Invitation (Now officially DEAD)
    Various other Dock cluttering WaterCrap
    --
  • I may "throw caution to the wind" and go with aluminum, might have found a spare set on a boat that is getting parted out. I envision solo sailing when trapping out on this boat, in light to moderate winds, or just using the wings to putz around with nonsailing passengers on a cocktail cruise in light airs. I do remember that compared to standing on hull, when you stand on wing and hike out- you are WAY out so points well taken. Appreciate all the advice icon_cool

    --
    eddiecat

    Nacra 5.0
    Hobie 16 (restored)
    Nacra 5.5
    --
  • eddiecatI may "throw caution to the wind" and go with aluminum

    If you suspect it might break, keep hooked to the trap, or you might see the boat sail away if it happens. Not sure if seated on the wing the trap whill stay hooked though, the wire will be loose and the bungee will prpobably be ineffective.



    Edited by Andinista on Jun 12, 2020 - 12:46 PM.

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