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RE: [bolger] Re: 85% complete Navigator, w/trlr, $300 Arkansas

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  • Adirondack Goodboat
    When I first had my Micro, it did not have the baffles at fore and aft ventilation openings. I took a group of family for a ride on the lake under outboard
    Message 1 of 17 , Jul 20, 2012

      When I first had my Micro, it did not have the baffles at fore and aft ventilation openings. I took a group of family for a ride on the lake under outboard power, and when we cruised into some wakes, I happened to see solid water coming through the forward vent, a brief waterfall. The little boat with so much rocker is liable to trim down by the bow if you have some people forward. That was a warning to me, and I quickly built the baffles, to plan. ---Mason


      From: bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] On Behalf Of Brian
      Sent: Friday, July 20, 2012 5:39 AM
      To: bolger@yahoogroups.com
      Subject: [bolger] Re: 85% complete Navigator, w/trlr, $300 Arkansas



      I have a classic Micro, which will FINALLY be back in the water shortly. It has the standard flotation (I think: aft quarters of the cargo hold and fwd under the anchor well), and has the double thickness bottom of 1/2". I think it could use a little more when going into rough conditions, but there will usually be various plastic boxes that, when secured, will add some flotation, unless ridiculously packed.

      In bad conditions, I'd probably worry first about the two ventilators, which have no closures at the moment. I doubt it will be a problem for the gentle sailing I intend to do this season.

      A Micro may not be an ocean-crosser, but I think it's a brilliant design for reasonable coastal and such.

      --- In bolger@yahoogroups.com, Harry James <welshman@...> wrote:
      > Keel mono hulls that don't have floatation sink when water comes in. The
      > idea is to keep the water from coming in. Micro is just as vulnerable to
      > this as any other boat. The J 24 is a large one design small racing keel
      > mono hull. Google "J 24 sinking", lots of them have sunk.
      > HJ
      > On 7/19/2012 7:10 AM, Robb wrote:
      > >
      > >
      > > As I understood the story.....the boats weren't being put on their
      > > side.....waves were splashing water in and the boat just went under. Robb
      > >
      > >
      > >
      > > On 7/19/2012 11:01 AM, Adirondack Goodboat wrote:
      > >>
      > >> That's a valuable contribution from Bruce, as always. In suggesting
      > >> that the Micro could be put on her side, I was thinking that this can
      > >> happen to her more by very severe ocean wave action tossing her
      > >> sideways, her keel and chine digging in and tripping her, than by
      > >> wind force as such.
      > >>
      > >> According to some wonderfully enlightening stuff in The Sailmaker's
      > >> Apprentice (whose author gives Phil Bolger a run for the money in
      > >> explaining the qualities of different rigs), the main reason boats
      > >> round up in gusts (and not just yawls) is that when they heel, the
      > >> sails' center of effort is so far outboard of the lateral resistance.
      > >> Standard Micros take a lot to make them heel very much. Bruce has the
      > >> Navigator, with the Chinese gaff, I believe, and can have way more
      > >> sail up than I can with the plain Micro.
      > >>
      > >> He's probably right too about holing being a greater danger than
      > >> swamping. I am of the tentative opinion that fiberglass would be of
      > >> more use on the inside of the bottom than the outside. Its strength
      > >> in tension would do far more to prevent puncture there, I think.
      > >>
      > >> But not both inside and outside, as was done to George Anger's
      > >> Whalewatcher and ruined it utterly.
      > >>
      > >> *From:*bolger@yahoogroups.com [mailto:bolger@yahoogroups.com] *On
      > >> Behalf Of *BruceHallman
      > >> *Sent:* Thursday, July 19, 2012 10:34 AM
      > >> *To:* bolger@yahoogroups.com
      > >> *Subject:* Re: [bolger] 85% complete Navigator, w/trlr, $300 Arkansas
      > >>
      > >> On Thu, Jul 19, 2012 at 5:08 AM, Adirondack Goodboat
      > >> <goodboat@... <mailto:goodboat%40frontiernet.net>> wrote:
      > >> > It is so hard to imagine them put on their sides, in
      > >> > conditions anyone would expect to sail them in, and at that point
      > >> they would
      > >> > have great righting moment. If companionway or hatch were open,
      > >> though, they
      > >> > would fill,
      > >>
      > >> Owning a Micro Navigator, I am not sure I agree with the above.
      > >>
      > >> It is possible to have too much sail up and get hit by a strong gust.
      > >> (I have done that!) What happens is that the geometry of the Cat Yawl
      > >> rig puts a tremendous force that spins the hull head up into the wind.
      > >> There is also some force that makes the boat heel over, and this
      > >> serves to release the hold of the rudder on the water, which simply
      > >> accelerates the heading up process.
      > >>
      > >> I cannot imagine the hatches (located on centerline) ever reaching
      > >> water to flood.
      > >>
      > >> The case where I think the positive flotation would come into play
      > >> would be if you hit something submerged and poke a hole in the hull.
      > >>
      > >> The Micro Navigator seaworthiness gets weak in really strong winds
      > >> simply because her natural tendency is to heave-to. So, if you were
      > >> beating off of lee shore you might not make the headway you need.
      > >> (That said, she draws only 14" of water, so you would run aground and
      > >> walk away upon that hard chance.)
      > >>
      > >> For best comparison look to the Bolger steel design Col. HG Hassler.
      > >> Paraphrasing from the PB&F writeup, she can withstand anything, up to
      > >> and including being run over and dragged full length under a super
      > >> tanker. The MicroNav, being wood, might break up, but has the same
      > >> buoyancy curves as the HG Hassler.
      > >>
      > >
      > >
      > >
      > >

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