Amateur Yacht Research Society

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

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

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 ...

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

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 ...

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...

https://www.maritimejournal.com/news101 ... rcial-sail is still working

(it needed the https)
Simon

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...

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...

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...

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...

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...

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...

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...

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)

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...

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...

See also announcement of RIN meeting on autonomous boats here http://www.ayrs.org/phpbb/viewtopic.php ... 2496#p2666

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...

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...

Nice video from Cambridge Univ.
https://youtu.be/UqBmdZ-BNig

Memory says once-upon-a-time she belonged to AYRS? or was that merely mooted but not carried through?

Can, 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

See also Catalyst No 11 page 9 http://www.ayrs.org/catalyst/Catalyst_N ... pdf#page=9 et seq

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 ...

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

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...

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...

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...

http://interestingengineering.com/world ... out-sails/


SF