Re: "Queen Mab" (design #638)Construction

There is no doubt that "added weight" is not desirable in a sail boat
(unless it is low in the hull) but I believe that, since the major
portion of the QM displacement is due to crew weight, the performance
will not be seriously affected by an additional 10 to 15lbs in the
hull. By my reckoning an additional 15 lbs will raise the water line
by about 1/4 inch. I can't imagine that will be significant to the
cruising performance (racing is another matter). Weight aloft is
probably alot more important than a few extra lbs in the hull, hence
my use of $7/bd-ft (wince!) sitka spruce for the spars.

I also think that Mr. Bolger's weight calculations may not be too far
off since he probably used published data for the density of Okume
plywood. The "brand name" Okume that I was able to obtain was
significantly heavier than the published information.

The main drawback that I see to an extra 10 to 15 lbs is in the
"heavier lift" to get the boat to and from the water. In this
case lighter is definitely better.

Al (in Ann Arbor)




--- Inbolger@egroups.com, "Catboater " <catboater@h...> wrote:
> There is NO structural problem if the boat weighs 28 pounds, My
Just
> Ducky is very strong at 28 pounds. I think Bolger seriously
> miscalculated the weight of a lapstrake ply constructed Queen Mab,
> evryone I know of who has chosen lapstrake ply for planking a Queen
> Mab has a very heavy boat. In this size boat 15 to 20 pounds makes
a
> BIG difference.
>
> Dave Thibodeau
>
>
>
> > Hi Marc,
> >
> > Sorry for the delayed response.
> >
> > The only water my QM has seen as yet is from the garden hose in
> > removing the amine "blush" from the epozy coating.
> >
> > I am already past the design weight without the decking and seat.
I
> > expect to be closer to 40 lbs when she is finished. I guess I
could
> > stand to lose 15 lbs anyway. My feeling is that a 25 lb boat
might
> be
> > structurally marginal, given the "feel" of the okume plywood that
I
> > am
> > using, which has resulted in 30 lbs sans deck, seat, and combing.
> One
> > might need balsa plywood (if there is such a thing.
> >
> > Will post more pictures when the deck is on.
> >
> > ps. Weight measurements before and after epoxy coating show about
a
> > 5%
> > to 10% weight increase (depending on the part) but I prefer the
> > "hardened" surface for durability.
> >
> > Al (in Ann Arbor)
> >
> >
> >
> >
> >
> > > Al,
> > >
> > > I just saw your post, and photos about your Queen Mab project
and
> > I'm
> > > wondering how she turned out?
> > > It's great to see a photo that gives a good idea of what she
looks
> > > like, a sweet looking little boat that has been on my wish
> > > list for awhile now. As I recall the designed weight is about 27
> > > pounds, is it true?? How does she sail? I'm dying
> > > for an ultralight dinghy to carry on top of my Honda, pick up
> with
> > one
> > > hand and fool around in. Thanks for the photos.
> > >
> > > Marc in SF
There is NO structural problem if the boat weighs 28 pounds, My Just
Ducky is very strong at 28 pounds. I think Bolger seriously
miscalculated the weight of a lapstrake ply constructed Queen Mab,
evryone I know of who has chosen lapstrake ply for planking a Queen
Mab has a very heavy boat. In this size boat 15 to 20 pounds makes a
BIG difference.

Dave Thibodeau



> Hi Marc,
>
> Sorry for the delayed response.
>
> The only water my QM has seen as yet is from the garden hose in
> removing the amine "blush" from the epozy coating.
>
> I am already past the design weight without the decking and seat. I
> expect to be closer to 40 lbs when she is finished. I guess I could
> stand to lose 15 lbs anyway. My feeling is that a 25 lb boat might
be
> structurally marginal, given the "feel" of the okume plywood that I
> am
> using, which has resulted in 30 lbs sans deck, seat, and combing.
One
> might need balsa plywood (if there is such a thing.
>
> Will post more pictures when the deck is on.
>
> ps. Weight measurements before and after epoxy coating show about a
> 5%
> to 10% weight increase (depending on the part) but I prefer the
> "hardened" surface for durability.
>
> Al (in Ann Arbor)
>
>
>
>
>
> > Al,
> >
> > I just saw your post, and photos about your Queen Mab project and
> I'm
> > wondering how she turned out?
> > It's great to see a photo that gives a good idea of what she looks
> > like, a sweet looking little boat that has been on my wish
> > list for awhile now. As I recall the designed weight is about 27
> > pounds, is it true?? How does she sail? I'm dying
> > for an ultralight dinghy to carry on top of my Honda, pick up
with
> one
> > hand and fool around in. Thanks for the photos.
> >
> > Marc in SF
--- Inbolger@egroups.com, "Marc " <marcos@m...> wrote:

Hi Marc,

Sorry for the delayed response.

The only water my QM has seen as yet is from the garden hose in
removing the amine "blush" from the epozy coating.

I am already past the design weight without the decking and seat. I
expect to be closer to 40 lbs when she is finished. I guess I could
stand to lose 15 lbs anyway. My feeling is that a 25 lb boat might be
structurally marginal, given the "feel" of the okume plywood that I
am
using, which has resulted in 30 lbs sans deck, seat, and combing. One
might need balsa plywood (if there is such a thing.

Will post more pictures when the deck is on.

ps. Weight measurements before and after epoxy coating show about a
5%
to 10% weight increase (depending on the part) but I prefer the
"hardened" surface for durability.

Al (in Ann Arbor)





> Al,
>
> I just saw your post, and photos about your Queen Mab project and
I'm
> wondering how she turned out?
> It's great to see a photo that gives a good idea of what she looks
> like, a sweet looking little boat that has been on my wish
> list for awhile now. As I recall the designed weight is about 27
> pounds, is it true?? How does she sail? I'm dying
> for an ultralight dinghy to carry on top of my Honda, pick up with
one
> hand and fool around in. Thanks for the photos.
>
> Marc in SF
Al,

I just saw your post, and photos about your Queen Mab project and I'm
wondering how she turned out?
It's great to see a photo that gives a good idea of what she looks
like, a sweet looking little boat that has been on my wish
list for awhile now. As I recall the designed weight is about 27
pounds, is it true?? How does she sail? I'm dying
for an ultralight dinghy to carry on top of my Honda, pick up with one
hand and fool around in. Thanks for the photos.

Marc in SF
Hi Mike,

In case you have not checked, under "Queen Mab Pics" in the "Files" I
posted some photos of my Queen Mab construction project, sans side
view drawing by the man himself (2nd thoughts about doing that
without
permission).

Regards,

Al in Ann Arbor



--- Inbolger@egroups.com, "Mike Stockstill" <mkstocks@b...> wrote:
> Hi Al -
>
> please post some photos some place!!!
>
> Thanks.
>
> Mike
>
>
> --- Inbolger@egroups.com, "albert m.straub" <amstraub1@a...>
wrote:
> > Dear Bolger Fans,
> >
> > My Queen Mab project is making slow but steady progress. Shear
> > Strakes
> > go on tonight. Expect to have it turned over for decking by the
> > Al in Ann Arbor
Hi Al -

please post some photos some place!!!

Thanks.

Mike


--- Inbolger@egroups.com, "albert m.straub" <amstraub1@a...> wrote:
> Dear Bolger Fans,
>
> My Queen Mab project is making slow but steady progress. Shear
> Strakes
> go on tonight. Expect to have it turned over for decking by the
> Al in Ann Arbor
Dear Bolger Fans,

My Queen Mab project is making slow but steady progress. Shear
Strakes
go on tonight. Expect to have it turned over for decking by the week
end. Nice thing about turning a 7' hull is that you don't have to buy
more beer and pizza than you can eat by yourself. However, a festive
mood may be a little more difficult to achieve.

Queen Mab's "well rounded" lap strake hull shape presented a real
challenge in maintaining fairness with the 4mm plywood. Wound up
using
temporary battens clamped against the outside of the lap joints to
smooth out the curves.

Another "invention" prompted by "necessity" made use of an 18" length
of 2X4 with a #16 common nail in the end, together with a plastic
milk
jug full of water (~8lbs). The result is a very adequate "spline
weight" or "lofting duck". Alot cheaper than the real thing (if you
can find them).

Al in Ann Arbor