[bolger] Re: Micro bulkhead B

Pippo,
I haven't built my Micro yet, but I think I can answer your questions.
1) The vertical side timbers on bulkhead B are tapered to reduce their incursion into the berth flats. The purpose is comfort and safety, not aesthetics.
2) and 3) The bottom of these timbers is slanted to allow water to drain from behind the frame, preventing rot and simplifying cleaning. For this reason the timber should probably end a little above the chine log, say ~0.5 cm. (imho)
4) The notched timber is indeed on the after face, and forms a ledge to support the forward edge of the cockpit deck, and well as the fore and aft running deck timbers. The notches are intended to form half lap joints with similar notches on the lower forward ends of the cockpit deck timbers. It is done this way to give maximum height through the bulkhead in the cabin below, for access to the space under the cockpit from the cabin for your portable toilet and your tootsies. Without this detail, you would have to make the timber deeper, like the one on bulkheads C and D. You can also cut beveled notches in the athwartship timber and cut matching bevels in the deck timbers, which may be stronger. Such joints are illustrated in _The Gougeon Brothers on Boat Construction_ and I have used it successfully on over a dozen boats. Alternately, you could simply butt the deck timbers to this piece, but that would certainly be a weaker structure. As to cutting the bevels, a hand saw and chisel, table saw with dado cutter, or a  router with a straight bit can be used to cut the notches. Of course, the notches must be cut before the timber is fastened to the bulkhead. If you have trouble visualizing all this from my words, rest assured, so do I. Let me know if you want me to sketch and scan what I'm talking about,
david

Giuseppe 'Pippo' Bianco wrote:

Dear Micro builders, I'm tackling now bulkhead B and I've a few
questions on it because I'm not absolutely sure that I'm correctly
reading the plans:

1) is there any reason why the two vertical side timbers are V-shaped?
Is it just for the sake of aestethics (as I think), in order not to show
a step at the chine log?
2) should they touch the chine log or not?
3) why is their lower extremity not horizontal, showing a slightly
slanted cut over the chine log?
4) My interpretation of the framing is that all framing timbers are on
the forward face, except the horizontal square timber which is on the
aft face. It looks like a 4x4 cm^2 square section (1.5x1.5 in^2).  How
did you notch it? The "sketchy" drawings show 2 cm (3/4") deep notches,
but the deck stringers should be 2x4 cm^2 (3/4"x1.5")...

Thanks all in advance. Best, Pippo

--
****************************************
Dr. Giuseppe Bianco
Centro di Geodesia Spaziale "G. Colombo"
Agenzia Spaziale Italiana
75100 Matera (MT), Italy
phone:  +39-0835-377209
fax:    +39-0835-339005
e-mail: giuseppe.bianco@...
****************************************

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Hi David, and thanks for your extremely clear and helpful message.

david <galvin-@...> wrote:

> 1) The vertical side timbers on bulkhead B are tapered to reduce their
> incursion into the berth flats. The purpose is comfort and safety, not
> aesthetics.

You're right, I hadn't thought to that aspect!

> 2) and 3) The bottom of these timbers is slanted to allow water to

drain

> from behind the frame, preventing rot and simplifying cleaning. For

this

> reason the timber should probably end a little above the chine log,

say ~0.5

> cm. (imho)

This sounds like the recurrent suggestion in George Buehler's book not
to leave dead air spaces, doesn't it?

> You can also cut beveled notches in the athwartship timber and cut

matching

> bevels in the deck timbers, which may be stronger.

OK, this is what I intented to do, since it seems also easier that the
half lap joints.

Thanks again! Best: Pippo

Dear Micro builders, I'm tackling now bulkhead B and I've a few
questions on it because I'm not absolutely sure that I'm correctly
reading the plans:

1) is there any reason why the two vertical side timbers are V-shaped?
Is it just for the sake of aestethics (as I think), in order not to show
a step at the chine log?
2) should they touch the chine log or not?
3) why is their lower extremity not horizontal, showing a slightly
slanted cut over the chine log?
4) My interpretation of the framing is that all framing timbers are on
the forward face, except the horizontal square timber which is on the
aft face. It looks like a 4x4 cm^2 square section (1.5x1.5 in^2). How
did you notch it? The "sketchy" drawings show 2 cm (3/4") deep notches,
but the deck stringers should be 2x4 cm^2 (3/4"x1.5")...

Thanks all in advance. Best, Pippo



--
****************************************
Dr. Giuseppe Bianco
Centro di Geodesia Spaziale "G. Colombo"
Agenzia Spaziale Italiana
75100 Matera (MT), Italy
phone: +39-0835-377209
fax: +39-0835-339005
e-mail:giuseppe.bianco@...
****************************************