Search found 30 matches
- Sat Aug 28, 2021 4:10 pm
- Forum: Craft
- Topic: Forward facing rowing
- Replies: 0
- Views: 28774
Forward facing rowing
For those who want to know how/if forward facing rowing systems work, a friend of mine has fitted one to his new boat. There is a Youtube video here: https://www.youtube.com/watch?v=NywPV4lVaw4
- Sat Jul 10, 2021 8:45 pm
- Forum: Hulls & Keels
- Topic: Historical examples of one-way outrigger boats
- Replies: 1
- Views: 58271
Re: Historical examples of one-way outrigger boats
Attached picture is from Hornell "Water Transport", pub: Cambridge, 1946, reprinted David & Charles, Newton Abbot, 1970.
The text in the body is almost identical to that you quoted and offers no new insight.
Simon
The text in the body is almost identical to that you quoted and offers no new insight.
Simon
- Fri Oct 23, 2020 3:48 pm
- Forum: Welcome to the AYRS Forums
- Topic: Attachments
- Replies: 2
- Views: 18862
Re: Attachments
I don't allow upload of files containing macros, so .xlsm is not allowable. .xlsx should be allowable if I have the board settings correct. I think the Administrators can override that setting, as a special case, if you have something with macros in that you really must have uploaded. In which case ...
- Wed Apr 29, 2020 5:32 pm
- Forum: Craft
- Topic: Halyard locks and reefing hooks
- Replies: 8
- Views: 23127
Re: Halyard locks and reefing hooks
That's a nice system - and presumably it works with reefed sails by adding another (or more) fixed pin at the appropriate position on the mast.
Did you devise it, or is it a commercial system?
Cheers
Simon
Did you devise it, or is it a commercial system?
Cheers
Simon
- Fri Dec 06, 2019 2:31 pm
- Forum: Craft
- Topic: Hydrofoiling Europe-Dinghy
- Replies: 0
- Views: 22228
Hydrofoiling Europe-Dinghy
Hydrofoiling Europe-Dinghy by Urde, Jesper and Karlsson, Simon An interesting paper by two students at Lund University, Sweden. Includes details of the foils used. Simon Hydrofoiling_Europe_Dinghy.jpg Abstract The aim of this master thesis was to develop and build a prototype of separate hydrofoils ...
- Fri Jun 14, 2019 8:26 pm
- Forum: Craft
- Topic: Chapman Sands SC threatened with closure
- Replies: 0
- Views: 22755
Chapman Sands SC threatened with closure
Chapman Sands SC, which probably did more than most in the UK to promote the development of modern multihulls, is threatened with closure as the local council have apparently decided to tax it as a profit-making business instead of a not-for-profit club. Please consider signing the petition to get t...
- Sat Mar 09, 2019 8:09 pm
- Forum: Events & other announcements
- Topic: Commercial Sail Type approval
- Replies: 2
- Views: 13498
- Mon Jan 21, 2019 11:41 am
- Forum: Craft
- Topic: Foiling Sailboards "porpoising"
- Replies: 0
- Views: 22632
Foiling Sailboards "porpoising"
At the AYRS meeting yesterday, Mark Tingley raised the topic of foiling sailboards "porpoising" that he'd observed at Speedweek. Essentially they build up a pitch oscillation that usually ends with the front of the board hitting the water, and the board crashing. He suggested that this may be due to...
- Mon Dec 03, 2018 5:45 pm
- Forum: Craft
- Topic: Ngalwa Sailing in Tanzania
- Replies: 1
- Views: 10934
Re: Ngalawa Sailing in Tanzania
Things may have changed since I was down on the coast (well, it was 50 years ago!), but memory says they were double outriggers, and memory also says there was no organisation as such that allowed you to book one, you had to negotiate with a fisherman to take you out (and there were a number of them...
- Fri Nov 30, 2018 4:17 pm
- Forum: Sails & Aerodynamics
- Topic: UK Sailmakers J109 Class 'Fluid Structure Interaction' Test Report
- Replies: 0
- Views: 22760
UK Sailmakers J109 Class 'Fluid Structure Interaction' Test Report
I found this to be a fascinating bit of reading Simon QUOTE In Grand Prix classes throughout the sport of sailing, it is well known that sheeting angles are becoming tighter and tighter – modern TP52s have jib sheeting angles as close as 4 degrees off the centreline. The J109 class in Ireland is a g...
- Tue Nov 27, 2018 7:06 pm
- Forum: Events & other announcements
- Topic: Call for papers: Power and Propulsion Alternatives for Ships
- Replies: 0
- Views: 22484
Call for papers: Power and Propulsion Alternatives for Ships
Royal Institution of Naval Architects Power and Propulsion Alternatives for Ships 23 January 2019, London, UK Call for Papers Shipping is vital to the world economy. It is a critical part of international import and export markets and supports the global distribution of goods. As for all industries...
- Sat Nov 24, 2018 8:36 am
- Forum: Events & other announcements
- Topic: New RINA eNewsletter App launched
- Replies: 0
- Views: 23223
New RINA eNewsletter App launched
http://news.rina-mail.org.uk/Yogip/RINA_V5/2/Images/HTMLEditor/EHID-1249/eed2f7f878b749c19abe03d4445d6f39.gif New eNewsletter App launched The Naval Architect eNews Shiprepair & Maintenance eNews Ship & Boat International eNews Warship Technology eNews Offshore Marine Technology eNews The Instituti...
- Mon Aug 20, 2018 9:54 am
- Forum: Sails & Aerodynamics
- Topic: WIND TUNNEL MEASUREMENTS OF THE PERFORMANCE OF CANOE SAILS FROM OCEANIA
- Replies: 0
- Views: 22820
WIND TUNNEL MEASUREMENTS OF THE PERFORMANCE OF CANOE SAILS FROM OCEANIA
I've been sent a copy of this paper http://www.jps.auckland.ac.nz/docs/Volume123/JPS_123_1_01.pdf by ANNE DI PIAZZA (Aix-Marseille Université, Centre National de la Recherche Scientifique), ERIK PEARTHREE and FRANÇOIS PAILLÉ (Ecole Nationale Supérieure de Mécanique et d’Aérotechnique) published orig...
- Sun May 06, 2018 7:26 pm
- Forum: Hulls & Keels
- Topic: Component Waveform Theory
- Replies: 1
- Views: 12229
Re: Component Waveform Theory
I found that article very interesting. The full paper, by Australian Alan Skinner, is at http://www.mcgowanmarinedesign.com/Home_files/Hull%20Speed_%202017.pdf It's quite a long paper (160pp), and doesn't print well. The first part is a review of the history of "rule of thumb" hull design methods, b...
- Fri Mar 16, 2018 9:34 pm
- Forum: Events & other announcements
- Topic: Jan/Feb Newsletter 2018
- Replies: 2
- Views: 13164
Re: Jan/Feb Newsletter 2018
Ask, and in your case it shall be given as you are a paid-up member.
(One of these days I shall make it automatic, but at present validating you as a paid-up member is a manual process)
(One of these days I shall make it automatic, but at present validating you as a paid-up member is a manual process)
- Fri Nov 10, 2017 3:50 pm
- Forum: Craft
- Topic: Flettner rotor ship
- Replies: 5
- Views: 22190
Re: Flettner rotor ship
As far as I can tell from the press release, they're for propulsion, and, although nothing says so, they could be useful for close quarter manoeuvring given that there is one at each corner of the ship. I'm not quite sure how you generate electricity from a rotor - they are not self-spinning, but ha...
- Fri Sep 22, 2017 12:15 pm
- Forum: Events & other announcements
- Topic: Composites Optimization of a Foiling C-Class Catamaran
- Replies: 0
- Views: 24051
Composites Optimization of a Foiling C-Class Catamaran
Some of you might be interested in this webinar. Composites World is one of those free industry magazines they send to anyone who says they are in the industry (since advertising revenue depends on circulation numbers). The information is technically oriented, but usually pretty accessible to the am...
- Tue Sep 19, 2017 12:34 pm
- Forum: Craft
- Topic: MicroTransat
- Replies: 21
- Views: 65659
Re: MicroTransat
See also announcement of RIN meeting on autonomous boats here http://www.ayrs.org/phpbb/viewtopic.php ... 2496#p2666
- Tue Sep 19, 2017 12:31 pm
- Forum: Events & other announcements
- Topic: Royal Institute of Navigation Meetings
- Replies: 1
- Views: 12455
Royal Institute of Navigation Meetings
http://www.rin.org.uk/images/logo_shadow.jpg The following RIN SCG events, taking place in October and November, may be of interest: 4 OCTOBER WEDNESDAY1800 The Cruising Association, CA House, 1 Northey St, London E14 8BT AUTONOMOUS VESSELS – A REAL REVOLUTION Prof. Andy Norris FRIN The second in a...
- Sat Jul 08, 2017 11:13 am
- Forum: Events & other announcements
- Topic: Eyemouth International Sailing Craft Association is selling its collection
- Replies: 0
- Views: 24558
Eyemouth International Sailing Craft Association is selling its collection
ONLINE AUCTION (Eyemouth, Cardiff & Lowestoft) Closing 12 Noon Wed 26th July 2017 * Being sold under the instructions of the liquidators of Eyemouth International Sailing Craft Association Limited (Eisca), a Scottish registered Charity MARITIME MUSEUM’S BOAT COLLECTION – Comprising: 270 Boats of Int...
- Sun Apr 23, 2017 11:33 am
- Forum: Sails & Aerodynamics
- Topic: Flow round a wing
- Replies: 1
- Views: 12203
Flow round a wing
Nice video from Cambridge Univ.
https://youtu.be/UqBmdZ-BNig
https://youtu.be/UqBmdZ-BNig
- Wed Mar 22, 2017 9:55 pm
- Forum: Members Sales and Wants
- Topic: C-class Emma Hamilton for sale on EBay
- Replies: 1
- Views: 12206
Re: C-class Emma Hamilton for sale on EBay
Memory says once-upon-a-time she belonged to AYRS? or was that merely mooted but not carried through?
- Mon Feb 06, 2017 9:00 pm
- Forum: Craft
- Topic: Offshore-capable foiler
- Replies: 0
- Views: 24112
- Sat Jan 28, 2017 6:59 pm
- Forum: Hulls & Keels
- Topic: Transonic hull
- Replies: 7
- Views: 23241
Re: Transonic hull
See also Catalyst No 11 page 9 http://www.ayrs.org/catalyst/Catalyst_N ... pdf#page=9 et seqCan, to some extent and for a limited range of speed, also be done with a single hull: http://www.duckworksmagazine.com/04/s/e ... /index.cfm
- Thu Jan 26, 2017 9:04 pm
- Forum: Hulls & Keels
- Topic: Transonic hull
- Replies: 7
- Views: 23241
Re: Transonic hull
Caveat - I've never seen one of these hulls in action ... BUT I have doubts that any single hull will operate without making waves*. I suspect that if you work out the curve of cross-sectional areas, and built another hull with the same curve it would have the same wave making characteristics -- or ...
- Sun Jan 15, 2017 9:54 pm
- Forum: Members Sales and Wants
- Topic: Wanted Drawings of Manners Trifoil
- Replies: 1
- Views: 12344
Re: Wanted Drawings of Manners Trifoil
Eric Manners did indeed die some years ago, and most of his archives were destroyed after his death. I'll see if I can dig out a contact, but don't hold out much hope.
Simon
Simon
- Sun Dec 25, 2016 10:41 pm
- Forum: Craft
- Topic: Trailers, a warning
- Replies: 2
- Views: 15484
Re: Trailers, a warning
For those who cannot (or don't want to) handle MSWord documents: Fredthecharlie wrote: A WARNING When checking your boat trailer don’t forget to look under the suspension units especially if they are mounted in a channel section; you might miss seeing something like this! It had been unused for seve...
- Mon Nov 14, 2016 11:09 pm
- Forum: Craft
- Topic: Kite surfing
- Replies: 1
- Views: 13318
Re: Kite surfing
There seems to be a difference between that part of the kite surfing world which is part of World Sailing and that part which is not (International Kite Sports Federation). IKSF don't want anything to do with World Sailing (formerly ISAF). The other problem is that if Kite Sailing becomes an Olympic...
- Wed Nov 09, 2016 10:43 am
- Forum: Welcome to the AYRS Forums
- Topic: Fishwics Brief Bio
- Replies: 2
- Views: 19396
Fishwics Brief Bio
1. Been sailing for a long time (50+ years) - mainly dinghies and other small boats 2. Helped develop RIBs before they became commercial 3. Have messed around with sailng canoes and proas, mainly of my own design 4. Professionally I am a retired electronic engineer, and now help run a sailing school...
- Thu Oct 06, 2016 10:50 am
- Forum: Craft
- Topic: Flettner rotor ship
- Replies: 5
- Views: 22190