Re: Yuloh's and salient keels [was]
Thank you Peter; that was the place. As to be expected with Bolger,
'salient' used meaningfully.
cheers
Derek
'salient' used meaningfully.
cheers
Derek
> 1.. A military position that projects into the position of theenemy.
e.g. The Battle of the Bulge.
Peter
sa·li·ent (sa'le-?nt, sal'y?nt)
adj.
1.. Projecting or jutting beyond a line or surface; protruding.
2.. Strikingly conspicuous; prominent. See synonyms at noticeable.
3.. Springing; jumping: salient tree toads.
n.
1.. A military position that projects into the position of the enemy.
2.. A projecting angle or part.
[Latin saliens, salient-, present participle of salire, to leap.]
sa'li·ent·ly adv.
I doubt he was referring to jumping tree toads or military positions.
Roger
adj.
1.. Projecting or jutting beyond a line or surface; protruding.
2.. Strikingly conspicuous; prominent. See synonyms at noticeable.
3.. Springing; jumping: salient tree toads.
n.
1.. A military position that projects into the position of the enemy.
2.. A projecting angle or part.
[Latin saliens, salient-, present participle of salire, to leap.]
sa'li·ent·ly adv.
I doubt he was referring to jumping tree toads or military positions.
Roger
----- Original Message -----
From: "pvanderwaart" <pvanderwaart@...>
To: <bolger@yahoogroups.com>
Sent: Wednesday, March 10, 2004 6:29 PM
Subject: [bolger] Yuloh's and salient keels [was]
> > And where is that writing found?
>
> "Brad added the inch and a half to her draft while lofting her...
> (He) argued that dropping the rabbet a little would make her easier
> to plank... He correctly added the same amount to the depth of the
> keel to retain the designed amount of sailent, flat-sided keel."
>
> 30-Odd Boats, pp 225
>
>
> Peter
>
>
>
>
> Bolger rules!!!
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> - stay on topic, stay on thread, punctuate, no 'Ed, thanks, Fred' posts
> - Pls add your comments at the TOP, SIGN your posts, and snip away
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[Non-text portions of this message have been removed]
> And where is that writing found?"Brad added the inch and a half to her draft while lofting her...
(He) argued that dropping the rabbet a little would make her easier
to plank... He correctly added the same amount to the depth of the
keel to retain the designed amount of sailent, flat-sided keel."
30-Odd Boats, pp 225
Peter
I thought the connotation of "Salient Keel" referred to to any part
of the hull that added lateral resistance but was not really a keel.
Like an immersed chine on a sharpie, all of the hull
of a asymetrical cat, like a Hobie 14.
The denotation may be way different.
Justin
of the hull that added lateral resistance but was not really a keel.
Like an immersed chine on a sharpie, all of the hull
of a asymetrical cat, like a Hobie 14.
The denotation may be way different.
Justin
--- pvanderwaart wrote:
Which Bolger boats have salient keels?
Micro, Old Shoe, Sea Bird '86, Swallow
[and others I don't recall.]
In the write up for Swallow, Bolger goes
on about how suitable the large fin is for
propelling a boat with a yuloh oar. The
oar needs the lateral resistance or you
get a 'tail wags the dog' effect.
Last week I sent Bolger copies of the
Micro Navigator construction photos
I shared here, and a letter describing
how I wanted to try a yuloh ,which included
my comments on what I had changed in his
design. He was neutral or positive on my
changes, :
Liking the offset bow transom steps,
Neutral on the increased roof hatch size,
Liking the reduced motor well opening size,
Enthusiastic about the use of a Yuloh,
Liking the ceiling mounted cleats,
Neutral about the changes in the windows,
Neutral about the ballast changes.
In his letter he explained how a yuloh
works "the action of a yuloh is on the
same principle as a propeller,
reciprocating instead of rotating".
This explanation makes much more sense
to me over the 'falling leaf' explanation
offered in the old Small Boat Journal
article, reprinted now on the internet.
I posted my yuloh sketches, Bolger's
letter, and my letter which is necessary
because he makes references to it...
http://hallman.org/bolger/micro/yuloh/
...and the photos are here.
http://community.webshots.com/album/121069753OCENAu
> In the discussion of the Story "Africa" design,And where is that writing found?
> perhaps among other places.
Which Bolger boats have salient keels?
Micro, Old Shoe, Sea Bird '86, Swallow
[and others I don't recall.]
In the write up for Swallow, Bolger goes
on about how suitable the large fin is for
propelling a boat with a yuloh oar. The
oar needs the lateral resistance or you
get a 'tail wags the dog' effect.
Last week I sent Bolger copies of the
Micro Navigator construction photos
I shared here, and a letter describing
how I wanted to try a yuloh ,which included
my comments on what I had changed in his
design. He was neutral or positive on my
changes, :
Liking the offset bow transom steps,
Neutral on the increased roof hatch size,
Liking the reduced motor well opening size,
Enthusiastic about the use of a Yuloh,
Liking the ceiling mounted cleats,
Neutral about the changes in the windows,
Neutral about the ballast changes.
In his letter he explained how a yuloh
works "the action of a yuloh is on the
same principle as a propeller,
reciprocating instead of rotating".
This explanation makes much more sense
to me over the 'falling leaf' explanation
offered in the old Small Boat Journal
article, reprinted now on the internet.
I posted my yuloh sketches, Bolger's
letter, and my letter which is necessary
because he makes references to it...
http://hallman.org/bolger/micro/yuloh/
...and the photos are here.
http://community.webshots.com/album/121069753OCENAu
> While I vaguely recall reading theIn the discussion of the Story "Africa" design, perhaps among other
> expression 'salient keel' in something written by PCB
> I cannot recall where. Do you perchance have the reference?
places.
The keel of the SeaBird '86 is mostly filled with lead ingots, not a
single casting, as illustrated in the drawing. Offhand, I can't
remember if there are some free-flooding spaces. My feeling is that,
in Bolger's mind, the alternative to the free-flooding volume is to
have it be solid wood. The greater weight of larger-dimensioned wood
would cost more, and the solid keel would have more buoyancy (not
wanted!) than the flooded hollow keel. The drain holes allow the boat
to weigh less on a trailer. The size of the flooding ports is
relatively immaterial.
Peter
--- Derek Waters wrote:
Another boat with this type of fin
keel is the Sea Bird '86, which has
1000 lbs of lead ballast. I can't
tell from the diagram if it is free
flooding, but I bet that it is.
Bolger wrote:
The keel shown
for Sea Bird �86 is like the one Day wanted
in the first place, with a minimum depth
that ensures reliable handling in had
conditions. A short, deep fin would make
her faster close-hauled with a skilled and
alert helmsman; however, the long, shal-
low keel is stronger, calls for less concen-
tration at the helm, is probably faster
reaching and running, and hangs on bet-
ter hove-to.
> While I vaguely recall reading theI forget, sorry.
> expression 'salient keel' in something
> written by PCB I cannot recall where.
> Do you perchance have the reference?
Another boat with this type of fin
keel is the Sea Bird '86, which has
1000 lbs of lead ballast. I can't
tell from the diagram if it is free
flooding, but I bet that it is.
Bolger wrote:
The keel shown
for Sea Bird �86 is like the one Day wanted
in the first place, with a minimum depth
that ensures reliable handling in had
conditions. A short, deep fin would make
her faster close-hauled with a skilled and
alert helmsman; however, the long, shal-
low keel is stronger, calls for less concen-
tration at the helm, is probably faster
reaching and running, and hangs on bet-
ter hove-to.
Hi Bruce
Salient just means "sticking out". In reference to keels it is sometimes
used as a synonym for 'effective' but the great man usually says exactly
what he means; no more, no less. While I vaguely recall reading the
expression 'salient keel' in something written by PCB I cannot recall where.
Do you perchance have the reference?
FWIW, there's a description of PCB's reasoning on the freeflooding fins to
be found in BWAOM, in the chapter on the plywood 12 1/2.
cheers
Derek
Salient just means "sticking out". In reference to keels it is sometimes
used as a synonym for 'effective' but the great man usually says exactly
what he means; no more, no less. While I vaguely recall reading the
expression 'salient keel' in something written by PCB I cannot recall where.
Do you perchance have the reference?
FWIW, there's a description of PCB's reasoning on the freeflooding fins to
be found in BWAOM, in the chapter on the plywood 12 1/2.
cheers
Derek