The Betz Law applied to early Dutch type windmills close to ground. It does not apply to Rotary Sails or aircraft airscrews which easily approach...
Rotary Sail on bicycle. Hello Michael, Thanks for summary of effects on your land machine. You have described very well the rapid increase in Cd...
God boy Rick! Further to this: An aircraft variable pitch propellor only needs to be spinning at half speed or less to make an acceptable Rotary...
The original "America" had much more going for it that subsequent designs. Thoroughly sea-worthy. Sail to the competition and thrash them! I...
Hello People. Re: An Invention Titled " A Propulsion Unit." Olen Holdings Pty, Ltd., Australia. Date of filing: 15th March, 1974. This...
Hello Good People! Most comments are constructive and to the point. I sailed on Oriana's last trip out of Brisbane hoping to promote a trial of a...
Hello Richard. I like ducts, but they are difficult to make. A simple narrow shroud encircling the blades works well. There is a patented ships...
I'm sorry Rick, but many of your facts reflect old technology. Try to listen and learn, unless you try to do this your pedal craft will not...
Hi Chaps! In total isolation my own experiments with what I liked to call Interface Machines began with sails and keels, then progressed through...
Hell Rick, I thought you were after performance as shown in your video of a sreamlined yellow crocodile. The craft show is a slow boat. Good...
Hello Duma Tau My sentiments exactly, that why I go for Rotary Sails! Cheers, Lin
Rotary Sails and Man Powered Vehicles (I use the word "man" as the short form of human. It has nothing to do with gender: male, female and etc.)...
Hello Rick, I wanted to give you some of the results of my early experiments with propellers. The prop shown on your site is not the best way to...
My early papers stressed the importance of Rotary Sail blade tip being designed for transonic conditions. I was delighted to discover years later,...
Hello Windmaster, Exactly my point. Cheers, Lin
Not true. My low speed model sailing yacht was stabilized by its Rotating Sail-flexible-drive- marine screw combination. Broaching 3 inch waves...
My National Service with 86 wing WT section of the RAAF. I may be a know-it-all rat-bag, but I never have to lie and a witness is still kicking...
"Got no money, Got no friends... ??? "
Good morning folks. 1 The term "prop/s" is short for propeller/s. 2 Counter rotating props neutralize yaw from torque. 3 Surface...
I do not mind valid criticism, but if you have a look at the Rotary Sail Trailer-Tri "Thrippence" you will see two obvious design details: 1. The...
