Re: Fast Motorsailer mods
Not trying to put you off, Ryan, but here is another consideration:
without increasing scantlings (thicker ply on the bottom?), will the
boat be strong enough with the extra section added? Five ft. is a lot
in a boat this size. Think of the forces at work when the hull is
supported in the middle by a wave, particularly if that wave is
moving at 20Kt or so. The trouble with flat sheets of plywood is that
they are not as rigid as sheets that are curved. There might not be a
problem unless you are using a large engine. PCB would have the
answers.
without increasing scantlings (thicker ply on the bottom?), will the
boat be strong enough with the extra section added? Five ft. is a lot
in a boat this size. Think of the forces at work when the hull is
supported in the middle by a wave, particularly if that wave is
moving at 20Kt or so. The trouble with flat sheets of plywood is that
they are not as rigid as sheets that are curved. There might not be a
problem unless you are using a large engine. PCB would have the
answers.
--- Inbolger@yahoogroups.com, "Ryan Cermak" <RCermak@t...> wrote:
> Find the center of gravity, split the hull there, move the two
> halves three to five feet apart, add in an extra frame (or two),
> cover with plywood, tape and epoxy the seams.
You need to think about (and possibly calculate) whether the hull
will trim correctly, at rest and while planing. You will be changing
the weight, the buoyancy and the dimensions of the planing surface.
With aircraft, I don't suppose you need to worry too much about
hydrostatics, or the hydrodynamics of planing surfaces either, except
with seaplanes or flying-boats.
Howard
--- Inbolger@yahoogroups.com, "Nels" <arvent@h...> wrote:
at the time he said that they didn't have the time to do them due to
other ongoing projects. At that time he didn't say anything about
better ideas but did send me 2 pages about sail plan mods that
someone over in Germany had done. Since we aren't too interested in
the sail part of motorsailer we are not getting the extra plan pages
for those.
Based on the fact that the hull is fairly straight sided and doesn't
curve too much, I don't think it will be too hard to add in the
extra length right in the middle to keep the center of gravity
moment near the same.
Part of my job when I was in the Air Force as a Boom Operator was
computing the CG of the KC-135's that I was flying on. In those
planes we had about 39" from forward to aft center of gravity limits
that we had to stay within.
Find the center of gravity, split the hull there, move the two
halves three to five feet apart, add in an extra frame (or two),
cover with plywood, tape and epoxy the seams.
I know it will be more complicated than that, but that should be the
basic process.
Ryan
> Good for you two. I will be following your progress with a greatdeal
> of interest. Take lots of photos for the visual folks, and makenotes
> for us cerebral types;-) Maybe do an article or two for Duckworksmag?
>the
> Have you run all your proposed changes past the Boss? NO I mean
> OTHER BOSS - Susanne:-)is
>
> I am sure they would have no objections, to any of the changes, it
> just that they may have some even better ideas.Yes, I did tell Phil (in a fax) about the mods we wanted to make but
>
> All the best, Nels
at the time he said that they didn't have the time to do them due to
other ongoing projects. At that time he didn't say anything about
better ideas but did send me 2 pages about sail plan mods that
someone over in Germany had done. Since we aren't too interested in
the sail part of motorsailer we are not getting the extra plan pages
for those.
Based on the fact that the hull is fairly straight sided and doesn't
curve too much, I don't think it will be too hard to add in the
extra length right in the middle to keep the center of gravity
moment near the same.
Part of my job when I was in the Air Force as a Boom Operator was
computing the CG of the KC-135's that I was flying on. In those
planes we had about 39" from forward to aft center of gravity limits
that we had to stay within.
Find the center of gravity, split the hull there, move the two
halves three to five feet apart, add in an extra frame (or two),
cover with plywood, tape and epoxy the seams.
I know it will be more complicated than that, but that should be the
basic process.
Ryan
--- Inbolger@yahoogroups.com, "Ryan Cermak" <RCermak@t...> wrote:
Good for you two. I will be following your progress with a great deal
of interest. Take lots of photos for the visual folks, and make notes
for us cerebral types;-) Maybe do an article or two for Duckworks mag?
Have you run all your proposed changes past the Boss? NO I mean the
OTHER BOSS - Susanne:-)
I am sure they would have no objections, to any of the changes, it is
just that they may have some even better ideas.
All the best, Nels
> Well, we finally did it. The check went out in the mail yesterdaysame
> for the plans for the Fast Motorsailer.
>
> My wife and I have been looking at it and other boats about the
> size for the past year. We finally decided to get off the fenceHi Ryan,
> about which one we wanted and just order the plans.
>
Good for you two. I will be following your progress with a great deal
of interest. Take lots of photos for the visual folks, and make notes
for us cerebral types;-) Maybe do an article or two for Duckworks mag?
Have you run all your proposed changes past the Boss? NO I mean the
OTHER BOSS - Susanne:-)
I am sure they would have no objections, to any of the changes, it is
just that they may have some even better ideas.
All the best, Nels
Well, we finally did it. The check went out in the mail yesterday
for the plans for the Fast Motorsailer.
My wife and I have been looking at it and other boats about the same
size for the past year. We finally decided to get off the fence
about which one we wanted and just order the plans.
No, I don't have any experience with boat building but I do have
carpentry, electrical, mechanical, plumbing, and some design
experience.
We are figuring on 6 months to build which will be just in time for
next spring and summer down here in Tampa.
We'll be building it in our yard and will try to keep a photo record
of the building and post the pictures on one of the Bolger groups.
We will be using it primarily as a motorboat and maybe some sailing.
Now, this is what I want to do, whether it will be feasible is
another thing.....
The design length is 22' 7", I want to extend it by 3 - 5 feet and
put in a shower/head.
We are planning on using it as a weekend coastal cruiser/camper in
and around the state and as a vacation boat for 1 - 2 week.
Like the one built by J. Stephen Crim, we will have a V-berth in the
bow. I plan on off-setting the helm to one side to allow for a
small convertable dinette, small gally with 2 burner propane stove,
ice box, sink, and storage shelves for bins. As mentioned above we
want a shower/head with hand/foot pumps for the water.
Water storage will be several 2 1/2 gallon water jugs, and a small
(5 gal ?) holding tank. We will plan on using a chemical port-a-
potty.
We're not sure about what size motor to use. It will probably
depend on what we can afford when the time comes to buy it. Using
the boat at displacement speeds would be okay with us right now, but
who knows about later on.....
Other mods will probably include the 12" extention of the house over
the foredeck for extra shelf space, eliminating the step up on the
sides to make the windows slightly taller, keeping the 4" higher
sheer line in the cockpit, and sliding hatch in the house roof.
Ryan Cermak
for the plans for the Fast Motorsailer.
My wife and I have been looking at it and other boats about the same
size for the past year. We finally decided to get off the fence
about which one we wanted and just order the plans.
No, I don't have any experience with boat building but I do have
carpentry, electrical, mechanical, plumbing, and some design
experience.
We are figuring on 6 months to build which will be just in time for
next spring and summer down here in Tampa.
We'll be building it in our yard and will try to keep a photo record
of the building and post the pictures on one of the Bolger groups.
We will be using it primarily as a motorboat and maybe some sailing.
Now, this is what I want to do, whether it will be feasible is
another thing.....
The design length is 22' 7", I want to extend it by 3 - 5 feet and
put in a shower/head.
We are planning on using it as a weekend coastal cruiser/camper in
and around the state and as a vacation boat for 1 - 2 week.
Like the one built by J. Stephen Crim, we will have a V-berth in the
bow. I plan on off-setting the helm to one side to allow for a
small convertable dinette, small gally with 2 burner propane stove,
ice box, sink, and storage shelves for bins. As mentioned above we
want a shower/head with hand/foot pumps for the water.
Water storage will be several 2 1/2 gallon water jugs, and a small
(5 gal ?) holding tank. We will plan on using a chemical port-a-
potty.
We're not sure about what size motor to use. It will probably
depend on what we can afford when the time comes to buy it. Using
the boat at displacement speeds would be okay with us right now, but
who knows about later on.....
Other mods will probably include the 12" extention of the house over
the foredeck for extra shelf space, eliminating the step up on the
sides to make the windows slightly taller, keeping the 4" higher
sheer line in the cockpit, and sliding hatch in the house roof.
Ryan Cermak