Presenter:John_Perry – Amateur Yacht Research Society

It seems we can’t find what you’re looking for. Perhaps searching can help.

AYRS Meetings • AYRS Eastern Local Group Meeting - Sunday 2nd October
Many thanks to Kim for setting up the meeting as below. I have also added these detail to the 'Events' page at ayrs.org and to the AYRS Facebook page.Please note that if in doubt the Events page at ayrs.org is generally the first place to look for details of forthcoming AYRS events and any updates […]
Members Sales and Wants • Hapas free to a good home
Roger Glencross has a collection of Hapas or "Chiens de mer", made by Didier Coste and/or Stéphane Rousson (see http://www.seaglider.fr/Seaglider/Seagl ... story.html, http://www.seaglider.fr/Seaglider/Bienvenue.html, https://fr.wikipedia.org/wiki/Voilier_des_airs, https://www.bateaux.com/article/19065/ ... dirigeable, https://www.youtube.com/watch?v=0KKnb0vQyzI.Roger has used these at almost every Speedweek for many years in order to try to aeroglide using a hang-glider or a parachute but now has to stop […]
Miscellaneous Craft • Pedal boat
This is genius:https://www.youtube.com/watch?v=HFS1ZJ2x41s&tHow come I never heard of this? The patent is from 1985, which should have been enough time for it to succeed. US patent 4496325 Collapsible paddle boat.pdf US patent 4496325 Collapsible paddle boat.pdfStatistics: Posted by Robert Biegler — Mon Jun 20, 2022 6:50 pm
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 […]