Flapping inverting foil (patent pending)

That might be the point that has been missed...and is the same point I was trying to make earlier.

 

I tryed it in open waters with big swells, a bit slow but amazing power.

 

Sculling with two oars in Vietnam. Similar concept but articulated blades?
http://cdn.c.photoshelter.com/img-g...karnaphuli-river-chittagong-bangladesh-22.jpg BANGLADESH

 

You're 100% ....Wait, what's this? 790 patents owned by Ebay..!! and more by GoPro !!
http://patft.uspto.gov/netacgi/nph-...bay&FIELD1=ASNM&co1=AND&TERM2=&FIELD2=&d=PTXT
http://patft.uspto.gov/netacgi/nph-...ne Search&Refine=Refine Search&Query=AN/gopro
If you want to protect, patent!!

 

Hand paddles ready for delivery! Choose your color scheme from yellow, orange, red, green, blue or purple...and even rainbow!

Need to go backwards, just grab a paddle and you're off!
http://youtu.be/bFGS5NKfo00

 

Wow. I think you just convinced me.

 

Are you pulling my leg and taking the piss out of me.
Its so funny.
Your post is the best I have read on boat design that makes me laugh, with no offensive to you, also admire your guts and determination.

 

Last name is Barrett. Just remember to Grin 'n Barrett !!
First person to like this comment gets a free paddle

....OOPS. No like function on this forum
If you still want one, I'll try to get you one. Inbox me.

This vid is for those with fall chores needing to be done just so you know....
http://youtu.be/czSLuONDq0A

 

This is a fine example about rip-off "Sears"

http://www.youtube.com/watch?v=sHIktR-3Ci4

 

Thank you for the great example of data driven discussion. If I plot the 180 watts(power out) on fig 4 of the referenced paper, and assuming first class athletes and the marathon is 5 hours, I suggest that the methodology employed is about 60% efficient based on capacity(power in) line. Is this a good assumption?

 

That's why you need a patent. When I patent the blade, the ship becomes mine.

As for tools, even Leatherman(r) gets patents...
https://www.leatherman.com/patents.html

and a trademark...
http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4804:k82v4o.2.4

 

So with that in mind, a fresh rower may want to go fast for the first say half hour and the take it easy for the next 2 and finish off with a 10 minute sprint....? Seems like a propeller is not a good fit for this speed profile if efficiency is the name of the game. Top speed on propellers kills low speed efficiency as previously mentioned.

 

Probably you don't understod how the sculling paddles work in the example of Bangladesh or Vietnam (they come just in wood lastly, not in rainbow colours sadly), but works as hydrofoils. As other sculling devices, are more efficient than normal oars but have limitations cause the proper vortexes at higher speeds. And the double sculling in southwest Asia have big simmilarityes with your technological improvement in xxi century, the big difference is what you do with elaborated geometry and flexibility of materials, they do with their wrists.
Normally a sculling oar still limitated in speed when used horizontally, but if turned vertically the speed have less limitations but the torque diminish. http://www.vortexosc.com/images/pdf/HydrofoilEng.pdf
http://www.vortexosc.com/modules.php?name=Content&pa=showpage&pid=11
http://www.vortexosc.com/modules.php?name=Content&pa=showpage&pid=91
http://www.vortexosc.com/images/pdf/HydrofoilEng.pdf
I don't know if 5 or 8 years ago I was studying this matter, and as you see in this few links what works in theory not ever is practical in real life. All depends if you design your -fins?-to work in a pond or in open waters, with wind and waves, for racing, cruising or whatever.
I find nice your work and some of your inputs very interesting, but -not me necessarily- some of the members of this forum have a great experience sailing, designing, researching and more, also with publication. So, please, be a bit more humble in your answers and some will enjoy more your advances and privilegiated intelligence.

 

https://www.youtube.com/watch?v=fr8-ILp4DMI
https://www.youtube.com/watch?v=p1p1z7UZi9s
https://www.youtube.com/watch?v=7_SMqVt5my4
[/url]https://www.youtube.com/watch?v=6hcmzrrfp6E

This are improvements over the japanese sculling oar "ro beso", more efficient than the Yuloh. You can see down below how it works to compare with the first videos, may be will serve to support your job too.

https://www.youtube.com/watch?v=VLb5A-5AyAc
https://www.youtube.com/watch?v=BX8MFCfGPnM

This AD SCULL have a patent too, and another one with the addition of a small piece of wood to eliminate negative vortexes. The wood must be flexible. But, the only problem becomes with the lose of torque, so wind and sea condition will affect it badly.

Your design can have a commercial place I suppose, but dont underestimate a heavy piece of wood that can beat any modern engine under certain circumstances.

 

To clear up any misunderstanding I have caused....

Under U.S. patent law, any person who "invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent." In general, this means you must satisfy the following four requirements to qualify for a patent:
The subject matter must be patentable.
The invention must be novel.
The invention must have some utility or usefulness.
The invention must not be obvious.
http://www.legalzoom.com/patents-guide/what-is-patentable.html

!/2 conduit rated at ~1500 in-lb
http://www.alliedeg.us/DB/PDF1/ATCE-L-1702-0806.pdf
...or 50 lbs at 30" on the paddle which is about 80 lb at 18" on rowing arm which is what I estimate happened when I bent it IMO