30' plywood sharpie

Angel, the lakes I go to are all reservoirs, behind dams on the Colorado River.

In order going up the river, here are the names and approximate sizes: Lake Havasu (80 square kilometers); Lake Mojave (100 square kilometers); Lake Mead (650 square kilometers), and Lake Powell (650 square kilometers).

Sailboats are relatively rare on the lakes, although they're well suited for it (except up into the canyons); most people have speedboats of one sort or another for fishing and water skiing. There are also charter houseboats available, for those who want to vacation on the water without investing in a boat.

All the personal pictures I have are on my other laptop, which crashed last year; I haven't wanted to spend the money to retrieve them. But I'll post some generic images off the internet, to give you a rough idea what the area is like.

edit: here's a pleasant little blog by someone who took his family sailing on Lake Mead for four days:

http://blog.unsinkable2.com/2008/06/sailing-lake-mead.html

 

Thanks for the info and the pics Troy . .

Cheers!
Angel

 

Thanks, just saw all three of them 1 - 2 - 3. The model has the booms nice in line which lacks on this real one*.

(* the sculling oar alongside the cabin also distort the hull and cabin lines in that image)

HAIKU - Booms in line looks much better . . . . .




LOA: 9.15 m - 30' 0"
Beam: 2.36 m - 7' 8"
Draft: 0.40 m - 1' 3"
Sail Area: 31.32 sq m - 337.00 sqf
Weight: 1590.90 kg - 3500 lbs
Displacement: 772.73 kg - 1700 lbs

Source of these drawings & specs.

Good Luck!
Angel

 

Lady B

Commodore Monroe’s Egret » Howard I. Chapelle's Dandy » J.R. Watson's Lady B

With two Egret style sharpies being designed on the thread (David* & Michel) here some news from that front . .

* How are you doing David . . . ? ?

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Lady B was launched on August 20, 2009.

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‘‘ Lady B is a Howard I. Chapelle-designed sharpie he called Dandy, based on Commodore Monroe’s Egret. I first saw this design when Boats magazine featured a series of articles titled The American Sharpie Yacht 1958. I kept those magazine articles and eventually built the boat with WEST SYSTEM® Epoxy. Dandy is a modification of Monroe’s design, so I thought it fair enough to make few modifications myself.’’ (see * below for the source of the quote)

Here are a few links about Lady B . . .

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1) Building a wood/epoxy Sharpie, a article (pdf) from Epoxyworks #15, Spring 2000.

Same article but with more pictures, for example this ones . . . .

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2) Designing & building the rudder and motor bracket, a article (pdf) from Epoxyworks #18, Fall 2001.

Same article but not PDF and smaller pictures.

The daggerboard style rudder in a well was discussed earlier in this thread from post #93 till #97 as it is also in the Dutch 29½' Egret style sharpie from post #85.

- - - -

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3) Now the launch of Lady B is the Cover story of Epoxyworks #30, Spring 2010.

* Here the Lady B article (pdf) from that issue.

Here the Lady B launch at the WEST SYSTEM Epoxy Blog.

Rounded composite chines.
NACA foil-shaped rudder and ballasted dagger board, both .0012 sections.

LOA 28
LWL 26
Beam 7'6"
Draft <1'
SA 290
Disp 2500
Aux 9.9 four-stroke outboard in well

Built in about 1100 hours.

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Good Luck!
Angel

 

As usual, Angel, you're posting some good links.

There's a lot of interesting stuff in those articles, and some of it's also useful. But I get the heebie-jeebies just looking at that daggerboard and daggerboard-style rudder. It defeats one of my major reasons for wanting a sharpie: very shallow draft.

 

I don't like the daggerboard either and certainly don't like the daggerboard-style rudder in a well, it's far to complex and expensive and therefore not sharpie like.

But you could consider a rudder and single centreboard with as much swing as HAIKU and give them a NACA profile.



Centreboard ~ NACA 0010 / 0012

Rudder ~ NACA 0012 / 0015

Example (click for specs -->) NACA 0012

(180° turn please to match the above HAIKU)

See post #2 in the 'Profiling a timber centre board' thread.

See also the 'Rudder Centre of pressure with PMB Foil ??' thread.

English wikipedia NACA airfoil.

German wikipedia NACA-Profile (more info).

Good Luck!
Angel

 

hey,
what do you guys think of the seway-fisher sharpies. the 24' mayfly and the 30' dragonfly.
there seems to be a lot of knowledge and opinion accumulated on this thread, and was considering building one of them. all opinions and info would be greatly appreciated, hope this still flows with the original thread
thanks
wayne

 

I don't know anything about them, and it's past my bedtime. But give me until sometime tomorrow, and with the aid of Google I'll magically become an internet expert....

 

Rudderdetails

I agree, it's a very interesting solution and has the advatages of being very hydrodramatical D ) and the daggerboard saves a lot of space inside, beside the fact that you save a lot of ballast due to the long leverarm if the ballasted dagger board is lowered.

But it has serious drawbacks too:
if you sail in shallow waters you will lose your steering ability, because the rudder reduces its area when it is beeing lifted up. If you run aground you have a good chance to break the rudder, because it cannot swing aft. The Rudder is expendable to build.

Alternatives: The traditional ruder of a sharpie ist a hydrodynamic catastrophe, generating some funny steering abilities. The transom-hung rudder is practical, easy to build and a matter of taste. An interesting alternative could be the rudder of the "Sonate Ovnis" aluminium yachts, which are under the bottom and have a shaft through the hull, but can swing back to reduce draft.

Grrreetings from the North Sea Coast, Michel

 

I wouldn't say the traditional rudder is exactly a catastrophe. It can give very positive steering at very low speeds, and in very shallow water. And transom-hung rudders aren't really that practical on a boat with a transom above the water.

Of course, if you were tonging for oysters you wouldn't have wanted the transom-hung rudder anyway; it would have gotten in the way when you swung the tongs up and around to drop oysters into the boat. That's the same reason the rounded stern was preferred: no corners to catch the tongs.

add: according to Chapelle, 6 foot rudders were common on working sharpies. That's a lot of rudder. But he also said that they usually got cut down at least a couple of feet on workboats that were converted to cruisers.

I'm almost certainly going to go with a traditional rudder and centerboard on my sharpie. If I'm not happy (or if I just get bored or curious), it won't be that much trouble to change them

 

From an hydrodynamic point of view the traditional sharpie rudders must be ineffective, because the waterflow around the long edges (pressure equation) must be massive. Bolger has some good practical results in fitting endplates on his shallow draft rudders.

But perhaps it's like with the bumblebee. Following aerodynamic rules a bumblebee is not able to fly. But her luck is that she does' nt know anything about aerodynamics. And so she is flying merrily from flower to flower.

In opposite to your opinion I think that a transom hung rudder is a good solution. They work very well on the NIS Sharpies. The transoms of our modern Sharpies will not be that high over the waterline to suffer ventilation. I will not dregde oysters. I just collect them for a good dinner

In my sharpie the decision of ruddertype is not made yet.

Michel

 

Aliens im Wattenmeer

Well, enough Pacific oysters in the Wadden Sea for that nowadays..!!

Bon appetit!
Angel

 

On the subject of "hydrodynamic" appendages in general: I'm not taking ownership of his views, but I was reading some interesting excerpts from one of Pete Culler's books today. He said that thick, slab-sided rudders and centerboards, rounded on the ends or even just squared off, seem to work better on traditional boats than the foil shapes. And he specifically said that when thick wooden centerboards were replaced with thinner metal plates, performance suffered noticeably--even if the trunk was thinned to match them. He concluded that apparently, for whatever reason, "thickness counts."

As I say, I'm not necessarily promoting or defending his opinion. But it's an interesting subject; I'll have to look into it a little more. Of course, the centerboards and rudders I've built have always been thick, slab-sided and flat, with the corners rounded off a little. Until I ran into Culler, I thought I was just being primitive and lazy. Had I read his book years ago, I would have started claiming I was just following in the footsteps of an acknowledged master....

 

Look at the bright side: I like raw oysters on the half shell better than mussels anyway...

 

I was mentioning the bright side, ‘‘Bon appetit’’ wasn't there for nothing . . :idea:

But mussels are nice too . .



Bon appetit!
Angel