Zoom Mtg. 25 April 2020 – Designing a Sliding Seat Rowing Boat – John Perry

27th April 202017th June 2020 John Perry 0 Comments rowing, rowing boat, sliding seat

John Perry gave a presentation about the design process for a 4.57m (15 foot) sliding seat rowing boat, this presentation being followed by video demonstrating the design features. The construction and use of the boat will be the subject of a following meeting.

Meeting Reports

Zoom Mtg. 11 April 2020 – A ‘Rescue Float’ for Beach Lifeguards – Kim Fisher

17th April 202017th June 2020 John Perry 0 Comments lifeguard, rescue craft

Kim Fisher presented the Rescue Float project which he is carrying out in collaboration with another AYRS member Chris Watson.

Meeting Reports

AYRS meeting at Thorpe (Surrey UK) – 3rd Nov 2019

22nd November 201922nd November 2019 John Perry 0 Comments Meeting, Surf Rescue

Report by John Perry – Another busy meeting with a constant flow of presentations from about 09:30 through to 16:30,

Meeting Reports News

Report of AYRS meeting at Thorpe 17-11-05

24th November 201715th November 2019 John Perry 0 Comments

Several hours of presentations of members’ projects were interspersed with chat over tea/coffee breaks together with a mid-day break for our packed lunches.

Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
[...]2.The batteries: there are for sure a lot of different batteries, all suitable to your project. Some are cheaper than other... I just want to mentioned that Caterpillar make a really good hybrid battery available worldwide and at an affordable price. It’s a regular 12V hybrid lead battery of 100 AH, group 31, maintenance free. […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Thank you Alex,I know about the comparatively large losses of the props. For this reason I try to go in the long term with a large and slow turning prop. I developed a software tool to calculate the shape of props - along the parameters given in the Dictionary of the International Towing Tank Conference […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Other few remarks...-I thing that knowing the real thrust out an electric motor is most important than anything else. This value has to be comparing to the residuary resistance of yours hull(s). Keep in mind, that the last link of the kinematic chain is the propeller. And let’s say that the maximum propeller efficiency you […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Thank you John,"... much depends on what kind of boating you want to do"I'll go slow and driving silently, That's the point for us to go electric and (partly) solar. 2014 and 2015 we were sailing a few days with roughly comparable electric boats we hired (but monohulls, 2 kW torqeedo outboard and the other […]
Power craft & engines • Re: solar electric propulsion of a power kat, 6.3 m
Curiosity lead me to look up the specification for the Haswing 3.0 electric outboard motor that you mention. (https://www.boxmarine.co.uk/products/ha ... controller). One thing I noticed is that this is advertised as a 5hp motor, and the specification actually says that the shaft power is 5hp, but when you read the details it says that the […]