27 July – site down for server maintenance (completed)

15th July 202029th July 2020 AYRS Webmaster 0 Comments

Our ISP have upgraded our server; you now need to use TLS1.2 if you have it. NOTE: Windows7 computers do

Meeting Reports

2020 AGM

12th July 202012th July 2020 AYRS Secretary 0 Comments

The draft Minutes of the 2020 AGM are now in the Members-only area of the Forum. These have not yet

Meeting Reports

Zoom Mtgs. 6th and13th June – From the UK to New Zealand – Bernard Rhodes

15th June 202011th July 2020 John Perry 0 Comments Bernard Rhodes, Klis trimaran

Bernard Rhodes tells us about the design and construction of the trimaran Kliss back in the 1960’s and his voyage

Meeting Reports

Zoom Mtg. 30 May – Antifouling Treatments – Open discussion

30th May 202017th June 2020 John Perry 0 Comments antifouling

For this meeting we invited members to share their experiences with antifouling treatments. A recording is at this link: Recording

Meeting Reports

Zoom Mtg. 23 May – Ideas for Generating Power from Natural Fluid Flow – Tom Potts

23rd May 202017th June 2020 John Perry 0 Comments power generation

Tom Potts described his ideas for generating power from the wind and from river or tidal currents and a general

Meeting Reports

Zoom Mtg. 16 May – A Reefable Soft Wingsail – Charles Magnan

16th May 202017th June 2020 John Perry 0 Comments wingsails

Charles Magnan presented his project to develop a reefable and furlable soft wingsail. The America’s Cup has shown that multi-element

Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
In http://web.archive.org/web/202007100100 ... ropsim.pdf I describe my own propeller simulation program and the large propeller I designed with it, using a Clark-Y flat-bottomed foil profile. The slip is very small at the best operating point. I'll try to compare the results with your program, Heimfried.Statistics: Posted by TheoSchmidt — Sat May 14, 2022 7:27 am
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
[...]Another remark concerning the pitch of 117 mm of your actual screw: with btrolling motors, due to the fact that the propeller is behind the motor and is working at various speed this could not be a pitch constant propeller. So it will be a good idea to check it by your self all along […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
This is an interresting topic that I want to fully understand. So let's say that you want to achieve 6kn. at full speed with your catamaran. You are using two trolling motors that rotate the propeller shaft at around 1450 RPM at full speed. Am I correct? [...]As I understand it, the full speed RPM […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Theo, did you design your prop yourself? You will certainly know about the free to use online tool "CAESES" basred on the work of the well known propeller experts from the Netherlands. But I had always the impression this will not be very appropriate to props for small boats, because the research is done regarding […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
This is an interresting topic that I want to fully understand. So let's say that you want to achieve 6kn. at full speed with your catamaran. You are using two trolling motors that rotate the propeller shaft at around 1450 RPM at full speed. Am I correct? If we want to figure what kind of […]

Zoom Meetings

27 July – site down for server maintenance (completed)

2020 AGM

Zoom Mtgs. 6th and13th June – From the UK to New Zealand – Bernard Rhodes

Zoom Mtg. 30 May – Antifouling Treatments – Open discussion

Zoom Mtg. 23 May – Ideas for Generating Power from Natural Fluid Flow – Tom Potts

Zoom Mtg. 16 May – A Reefable Soft Wingsail – Charles Magnan

Upcoming Events

‘All-day’ discussion meeting – (with AGM included during the afternoon)