... We are not arguing abstract pros and cons here - if you calculate the optimum blade angle, you will simply find that it goes negative in the extreme case....
... doubt ... Thanks for the time and effort you spent again to educate me and others like me. You are a patient man Hugh. Best regards. Kerem Toral...
Wow, this negative pitch question has generated a lot of good explanations. Thanks to Hugh, and everyone else for helping to explain it. Also enjoyed Bob...
hi all: i really enjoy this discussion as it really makes the brain work. many people are working to understand this thing called negative pitch angle, and...
Hello from NE Wisconsin: I found a model zoning code on a site long ago. That zoning was there for one's use, so I make it available for all to read: ...
This is really to Jim Barr-I am another sailor. I think if your sail were really shaped like an airfoil section with a convex leward surface and a falttish...
Hi Jim and All, ... Not true for 1 sailboat at least. They took a 30' sailboat and mounted a 20'dia 3 blade wind rotor driving a shaft down to an angle gear,...
hello all: i have been thinking a lot these last few days re: the discussion on negative pitch angles etc.. i really have to tell you that this discussion has...
9535
garciah
garciah@...
Jan 4, 2003 1:36 pm
Australia Plans 1-Km High Structure, Taller Than CN Tower Thu Jan 2, 9:11 PM ET By Michelle Nichols MELBOURNE (Reuters) - The world's tallest man-made...
Hello all: I, like many others, have been "lurking" on this list for some time now having posted in the past quite infrequently. I have been fascinated by this...
Greetings and Happy New Year. Thank you Kirk for this very interesting discussion. I confess I remain confused about the water mist in the fence and how the...
... From: Daniel Day ... McDonnell Douglas published a numerical study in a VAWT conference in the late 70s that showed that the best ratio of blade length to...
9539
jim barr
wandana@...
Jan 4, 2003 4:56 pm
Hi Jerry, Point taken, but I was referring to conventional sails ( Bermudan rig in particular) The turbine driven boat raised interesting ideas about the boat...
The 15 watts per square foot is based on the ionized water being part of a 25 mph stream. If I put 1 square foot of fence in a wind tunnel and measure the...
Would you eat dinner in a restaurant on the top? ... A wonder of the modern world. Kirk ... From: garciah [mailto:garciah@...] Sent: Friday, January 03,...
I am trying to give it a rest, but here's one more..... (3 more?) ... I am talking about conventional airfoils. Anything with best lift/drag at about 5 degree...
9543
RVD
RVDstudio@...
Jan 4, 2003 8:46 pm
I'm sorry folks, but Hugh's vector drawing actually confused me. I thought I understood the principle behind the negative pitch before I saw it. Please look at...
... different animals, not only by physical design, but by intended purpose as well. Aircraft take the chemical energy stored in various fuels and turn it into...
Slotted wings were known to the Wright bros. The slot is also the principle upon which overlapping sails depend. Ships have had these for hundreds of years,...
... In my drawing the wind is from the left, and the blade is moving downward. The blunt leading edge leads the blade. It travels many times faster than the...
9547
RVD
RVDstudio@...
Jan 5, 2003 4:23 am
... YES! I got it now. I didn't even see you did state wind direction in the drawing. Thanks! Only one question left then, what is drag? Ross...
Hi all, Finally taking some time to put my 2+ cents in. It’s been a long time. I have a special interest in this subject as I think there has been quite a...
9549
RVD
RVDstudio@...
Jan 5, 2003 4:23 am
... Sure as long as no one opened the window... I wonder how close planes would be affected by the huge wind blast gushing out the top. How much desert dust...
Kirk, The only major problem I have with your statement below is that putting a "fence" like that in a wind tunnel will give you different performance than...
Don't know. Wish I knew more about electrostatics. Most people have seen the friction generators in school and the cat fur rubbed on a fluorescent bulb and...
9553
garciah
garciah@...
Jan 5, 2003 3:19 pm
Michael: One of the problems not even hinted here is the power needed to start the system into operation and the running power to keep it working. The power...
Hello R I am sure I sense a touch of sarcasim in the tone of your comment. I am sure that someone would have thought not to place this tower in a major air...
