ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

To help other builders, please list the boat you are building in the Thread Subject -- and to conserve space, please limit your posting to one thread per boat.

Please feel free to use the gallery to display multiple images of your progress.
TomW1
Very Active Poster
Very Active Poster
Posts: 2708
Joined: Sun Apr 19, 2015 10:57 pm
Location: Bryson City, NC

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by TomW1 » Wed Sep 26, 2018 2:18 pm

I bet your glad your provisioned and GS is on the moveable crane heading for water. Have a great cruise and as always will look forward to pics of your cruise.

Tom


Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

Fuzz
* Bateau Builder - Expert *
* Bateau Builder - Expert *
Posts: 4329
Joined: Tue Aug 02, 2011 4:23 am
Location: Kasilof, Alaska

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Fuzz » Wed Sep 26, 2018 11:37 pm

"Three months of cruising" Now that is how to take a break from boat building trials :D
so your centerboard drops straight down? I was thinking it would be hinged but what do I know.

User avatar
glossieblack
* Bateau Builder *
* Bateau Builder *
Posts: 2407
Joined: Wed Jan 02, 2013 1:28 pm
Location: Australia

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Thu Sep 27, 2018 4:31 am

Thanks for the well wishes Tom. :D

Yes Fuzz, the board drops vertically through a slot in the lead keel. It is raised and lowered by hand, using a sheet with a 2:1 purchase.

Image
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

Jaysen
* Bateau Builder *
* Bateau Builder *
Posts: 3308
Joined: Wed Aug 05, 2015 7:59 am
Location: St Helena Island, SC

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by Jaysen » Thu Sep 27, 2018 7:09 am

Lifting keel has ballast bulb which explains why it’s not called lifting keel. Leeboards are on the side but are vertical drop/lift. I thought center board was defined as pivoting. that leaves dagger board but then it’s too big.

Have you ever grounded with the CB down? How difficult was it to lift (assuming you’ve been there)?

TomW1
Very Active Poster
Very Active Poster
Posts: 2708
Joined: Sun Apr 19, 2015 10:57 pm
Location: Bryson City, NC

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by TomW1 » Thu Sep 27, 2018 4:23 pm

Jaysen wrote:
Thu Sep 27, 2018 7:09 am
Lifting keel has ballast bulb which explains why it’s not called lifting keel. Leeboards are on the side but are vertical drop/lift. I thought center board was defined as pivoting. that leaves dagger board but then it’s too big.

Have you ever grounded with the CB down? How difficult was it to lift (assuming you’ve been there)?
They are still called lifting keels or dagger boards. They do not necesarily have to have a weighted bulb on them, but can. It just means a keel that is vertically risen by hand or electrical motor. They are of various shapes and NACA fin designs, depending on there use and the use of the sailboat. A racing boat may have a highly developed NACA foil of fiberglass with SS rods in it for strength. A cruising boat may just be a peice of steel that can be lowered for improved upwind performance.

Tom
Restored Mirror Dinghy, Bought OD18 built by CL, Westlawn School of Yacht Design courses. LT US Navy 1970-1978

User avatar
glossieblack
* Bateau Builder *
* Bateau Builder *
Posts: 2407
Joined: Wed Jan 02, 2013 1:28 pm
Location: Australia

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Fri Sep 28, 2018 5:15 am

TomW1 wrote:
Thu Sep 27, 2018 4:23 pm
They are still called lifting keels or dagger boards. They do not necesarily have to have a weighted bulb on them, but can. It just means a keel that is vertically risen by hand or electrical motor. They are of various shapes and NACA fin designs, depending on there use and the use of the sailboat. A racing boat may have a highly developed NACA foil of fiberglass with SS rods in it for strength. A cruising boat may just be a peice of steel that can be lowered for improved upwind performance.

Tom
Correct. And Great Sandy's board is a sacrificial foil.
Jaysen wrote:
Thu Sep 27, 2018 7:09 am
Have you ever grounded with the CB down? How difficult was it to lift (assuming you’ve been there)?
Jaysen, your question cuts to the quick.

Yes, I've grounded a number of times with the board down. And given GS's setup, the result is not pretty, but it's as safe as, because the board is designed to be sacrificial, rather than the centreboard case.

Picture GS moving at say seven knots with the sails powered up, the board down, even only a foot down, and suddenly she strikes the bottom. Seven tonnes of momentum suddenly grinds to a halt. What gives? Please not the centreboard case, because the prospect of sinking is not an attractive option. Far better that the centre board is destroyed because it has been designed to be sacrificial.

How difficult is it to lift a destroyed board? You' can't lift a destroyed centre board. What remains of it swells to the point it can't be raised back through its slot.

Next time you haul out, you use an angle grinder or chain saw to cut off the swollen mess protruding below the lead keel, wait for swelling in the remaining board to dry out enough to enable it to be winched out up through the boat using the mainsail halyard, repair the board, and re-install it.

Having as shoal draft centre-boarder like Great Sandy , every now and then you pay this price. But the reward is that you can cruise shoal waters that few others can. And in today's increasingly congested world, that's approaching priceless. :D
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

User avatar
cape man
* Bateau Builder - Expert *
* Bateau Builder - Expert *
Posts: 5258
Joined: Sun Jan 20, 2008 12:02 pm

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by cape man » Fri Sep 28, 2018 6:12 am

Are we sailing?
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

User avatar
glossieblack
* Bateau Builder *
* Bateau Builder *
Posts: 2407
Joined: Wed Jan 02, 2013 1:28 pm
Location: Australia

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Fri Sep 28, 2018 7:22 am

cape man wrote:
Fri Sep 28, 2018 6:12 am
Are we sailing?
https://www.youtube.com/watch?v=0jdQk7CNB0s[url][/url]
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

User avatar
cape man
* Bateau Builder - Expert *
* Bateau Builder - Expert *
Posts: 5258
Joined: Sun Jan 20, 2008 12:02 pm

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by cape man » Fri Sep 28, 2018 7:26 am

Man you are looking good for an old Cloof!
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

User avatar
glossieblack
* Bateau Builder *
* Bateau Builder *
Posts: 2407
Joined: Wed Jan 02, 2013 1:28 pm
Location: Australia

Re: ST21 Hybrid Powered "SKINNYDIP" Noosa Australia

Post by glossieblack » Fri Sep 28, 2018 7:29 am

:lol: :wink:
Completed R13 two part nesting rowboat. ST 21 under construction .... where seeking perfection is recognized as the enemy of the good.

Post Reply

Who is online

Users browsing this forum: Arm&Hammer and 5 guests