Re: [bolger] Yellow Leaf wet
Justin Meddock wrote:
My goal is a very light weight cartoppable two
person boat, so I am reluctant to add any
unnecessary weight. Though, I am thinking
of adding a small inwale for the middle half
of the boat, and pinted canvas fairings
over the bow and stern 'triangles'. The former
to give a place for a 'handhold', and to strengthen
the sides a bit, and the latter to keep some of
the surf from washing into the boat. I might also
put a tiny skeg to help with the tracking.
Yes, that is 1/4" AC fir plywood.
> Did you put any inwales (or outies) on it?It flexes a lot, but so what, it is still very strong.
> If you didn't use them, does it flex too much?
> Is that Fir ply, or?
My goal is a very light weight cartoppable two
person boat, so I am reluctant to add any
unnecessary weight. Though, I am thinking
of adding a small inwale for the middle half
of the boat, and pinted canvas fairings
over the bow and stern 'triangles'. The former
to give a place for a 'handhold', and to strengthen
the sides a bit, and the latter to keep some of
the surf from washing into the boat. I might also
put a tiny skeg to help with the tracking.
Yes, that is 1/4" AC fir plywood.
I was on a 24 footer a year or so ago that had the board down and hit
some rocks. It felt like something was hitting the boat from below and
pushing it violently UP, with no backward component! So I'm thinking
that you might want the pivot to be able to support a substantial
fraction of the boat's weight.
Perhaps the 1" pin was specified to spread the load in whatever material
it sets into. Or perhaps to reduce wear.
I wouldn't trust plastic very far in this application. Compared to
metal, plastic pipe is very weak.
some rocks. It felt like something was hitting the boat from below and
pushing it violently UP, with no backward component! So I'm thinking
that you might want the pivot to be able to support a substantial
fraction of the boat's weight.
Perhaps the 1" pin was specified to spread the load in whatever material
it sets into. Or perhaps to reduce wear.
I wouldn't trust plastic very far in this application. Compared to
metal, plastic pipe is very weak.
>Roger Derby wrote:
>I like that idea. My next trip to Home Depot I'll scrounge thru the plastic
>pipe fittings section.
>
>Any idea how to figure the loads on the pivot? The lateral thrust of the
>board is taken by the bottom of the slot and the top of the case. Running
>aground, the loads are unpredictable -- if you went straight in, the board
>would just pivot up, but that seems unlikely. (Why did PCB specify a 1"
>steel pivot pin? Why not 1/2"? )
>
>Roger
>derbyrm@...
>derbyrm.mystarband.net/default.htm
>
OK. As I said, I couldn't figure a way to anticipate the sort of loading
the pin might see. Plain sailing wasn't it.
The 1" solid SS rod should support several Chebaccos. It's set into two
1/4" thick SS plates on the case and two on the CB itself. Now if the rest
of the boat were as strong. Maybe I'll put an extra layer of glass tape in
way of the CB case to hull connection in that area.
Roger
derbyrm@...
derbyrm.mystarband.net/default.htm
the pin might see. Plain sailing wasn't it.
The 1" solid SS rod should support several Chebaccos. It's set into two
1/4" thick SS plates on the case and two on the CB itself. Now if the rest
of the boat were as strong. Maybe I'll put an extra layer of glass tape in
way of the CB case to hull connection in that area.
Roger
derbyrm@...
derbyrm.mystarband.net/default.htm
----- Original Message -----
From: "Lincoln Ross" <lincolnr@...>
> I was on a 24 footer a year or so ago that had the board down and hit
> some rocks. It felt like something was hitting the boat from below and
> pushing it violently UP, with no backward component! So I'm thinking
> that you might want the pivot to be able to support a substantial
> fraction of the boat's weight.
>
> Perhaps the 1" pin was specified to spread the load in whatever material
> it sets into. Or perhaps to reduce wear.
>
> I wouldn't trust plastic very far in this application. Compared to
> metal, plastic pipe is very weak.
>
> >Roger Derby wrote:
> >I like that idea. My next trip to Home Depot I'll scrounge thru the
plastic
> >pipe fittings section.
> >
> >Any idea how to figure the loads on the pivot? The lateral thrust of the
> >board is taken by the bottom of the slot and the top of the case.
Running
> >aground, the loads are unpredictable -- if you went straight in, the
board
> >would just pivot up, but that seems unlikely. (Why did PCB specify a 1"
> >steel pivot pin? Why not 1/2"? )
> >
> >Roger
> >derbyrm@...
> >derbyrm.mystarband.net/default.htm
> >
>
>
>
>
>
> Bolger rules!!!
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> - Pls add your comments at the TOP, SIGN your posts, and snip away
> - Plans: Mr. Philip C. Bolger, P.O. Box 1209, Gloucester, MA, 01930, Fax:
(978) 282-1349
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> - Open discussion:bolger_coffee_lounge-subscribe@yahoogroups.com
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>
>
>
>
>
>
Never mind.
I just took the time to sketch out the area and with eight tee-nuts on the
inside of the CB case holding two 1" x 5" x 6" blocks, the pin is
constrained and the water kept out.
Sometimes one makes mountains out of ...
Roger
derbyrm@...
derbyrm.mystarband.net/default.htm
I just took the time to sketch out the area and with eight tee-nuts on the
inside of the CB case holding two 1" x 5" x 6" blocks, the pin is
constrained and the water kept out.
Sometimes one makes mountains out of ...
Roger
derbyrm@...
derbyrm.mystarband.net/default.htm
I like that idea. My next trip to Home Depot I'll scrounge thru the plastic
pipe fittings section.
Any idea how to figure the loads on the pivot? The lateral thrust of the
board is taken by the bottom of the slot and the top of the case. Running
aground, the loads are unpredictable -- if you went straight in, the board
would just pivot up, but that seems unlikely. (Why did PCB specify a 1"
steel pivot pin? Why not 1/2"? )
Roger
derbyrm@...
derbyrm.mystarband.net/default.htm
pipe fittings section.
Any idea how to figure the loads on the pivot? The lateral thrust of the
board is taken by the bottom of the slot and the top of the case. Running
aground, the loads are unpredictable -- if you went straight in, the board
would just pivot up, but that seems unlikely. (Why did PCB specify a 1"
steel pivot pin? Why not 1/2"? )
Roger
derbyrm@...
derbyrm.mystarband.net/default.htm
----- Original Message -----
From: "Kurt Herzog" <kpherzog@...>
> The late Joe Dobler designed a centerboard pivot made from two
> thru-hull fittings. The 2 fittings are installed, one on each
> side of the case with the "outside" part of the fitting inside
> the case, set in flush. The threaded ends of the fittings are on
> the outside of the case. Pipe caps are screwed on, with the pin
> "floating" freely inside. This scheme has always appealed to me
> as being easy and water-tight. I believe Joes specified bronze
> fittings for large boats, but it occurs to me that for small
> boats one might be able to fabricate a similar scheme from
> plastic pipe (a floor flange and threaded adapter, cemented
> together).
The first launch of a Bolger boat,
(finally), the surf conditions at my local beach
were smooth enough for me to launch my
Bolger Yellow Leaf, which I build last winter
as some of you will recall.
http://hallman.org/bolger/YellowLeaf/
The boat weights about 35 lbs dry, and
40 lbs wet. I padled it with my kayak
double ended padle from my Kotick
experiment. I tried it as a surf board
once, and it surfed OK until the bow
dug in, and she broached. Turning
upside down, full of water, it took two
people to right her due to the weight.
Later I learned to time it to return
through the surf between waves,
taking turn giving the kids rides
and padleing out to talk with the
salmon fisherman.
(finally), the surf conditions at my local beach
were smooth enough for me to launch my
Bolger Yellow Leaf, which I build last winter
as some of you will recall.
http://hallman.org/bolger/YellowLeaf/
The boat weights about 35 lbs dry, and
40 lbs wet. I padled it with my kayak
double ended padle from my Kotick
experiment. I tried it as a surf board
once, and it surfed OK until the bow
dug in, and she broached. Turning
upside down, full of water, it took two
people to right her due to the weight.
Later I learned to time it to return
through the surf between waves,
taking turn giving the kids rides
and padleing out to talk with the
salmon fisherman.
The late Joe Dobler designed a centerboard pivot made from two
thru-hull fittings. The 2 fittings are installed, one on each
side of the case with the "outside" part of the fitting inside
the case, set in flush. The threaded ends of the fittings are on
the outside of the case. Pipe caps are screwed on, with the pin
"floating" freely inside. This scheme has always appealed to me
as being easy and water-tight. I believe Joes specified bronze
fittings for large boats, but it occurs to me that for small
boats one might be able to fabricate a similar scheme from
plastic pipe (a floor flange and threaded adapter, cemented
together).
Kurt P. Herzog
Grants Pass, Oregon
thru-hull fittings. The 2 fittings are installed, one on each
side of the case with the "outside" part of the fitting inside
the case, set in flush. The threaded ends of the fittings are on
the outside of the case. Pipe caps are screwed on, with the pin
"floating" freely inside. This scheme has always appealed to me
as being easy and water-tight. I believe Joes specified bronze
fittings for large boats, but it occurs to me that for small
boats one might be able to fabricate a similar scheme from
plastic pipe (a floor flange and threaded adapter, cemented
together).
Kurt P. Herzog
Grants Pass, Oregon
> The boat weights about 35 lbs dry, andDid you put any inwales (or outies) on it?
> 40 lbs wet.
If you didn't use them, does it flex too much?
Is that Fir ply, or?
Justin