I thought this design let the front blades spin one direction (turning the rotor) and the back set of blades spin the opposite direction (turning the stator).....
No... Doug's is a little different dual rotor set up. For conventional contra rotating rotors you are right... but the downstream rotor only has about 1/3 the...
Harold, The arrangement you describe [contra rotation] was first put forward by Honnef in Germany, in "Windkraftwerke" published in 1932, researched by the 3rd...
... Go to a big public library or the library at an engineering school. Ask for a research librarian and ask for the librarian's recommendation. You would be...
David G. LeVine
dlevine144@...
Mar 3, 2008 10:54 pm
1115
... A ferrous core will improve efficiency at the expense of cogging effects. If the particles are small enough, are insulated from each other, and do not...
David G. LeVine
dlevine144@...
Mar 3, 2008 10:54 pm
1116
... Where did you find them for that price? The best price I found was above $50.00 when I got one. -- David G. LeVine Nashua, NH 03060...
David G. LeVine
dlevine144@...
Mar 4, 2008 12:07 am
1117
WARNING, engineer speak. ... Nope. As you get above 3 phases, the costs and weights of components starts to rise. A three phase system generally uses three...
David G. LeVine
dlevine144@...
Mar 4, 2008 12:07 am
1118
... Not really, look up a stepping motor (stepper). What they generally do is first slowly put steps into the motor, then ramp up to speed. The first step is...
David G. LeVine
dlevine144@...
Mar 4, 2008 12:08 am
1119
... Glass, aramid (like Kevlar) or carbon fiber are generally good strength members to prevent forces on a rotating structure from pulling the assembly apart....
David G. LeVine
dlevine144@...
Mar 4, 2008 12:08 am
1120
The Trimblemill [see Group files] uses three blades on the front rotor for speed, and five on the back rotor for maximum power collection - following the...
Mark All Tower Cranes have a small slip ring assembly at the top to transfer power from the ground supply to the crane drive motors. Used on the Trimblemill...
... rotor for speed, and five on the back rotor for maximum power collection - following the establishment of this number by John Smeaton in his modal...
Are you asking about the electrical connection or the mechanical connection? Huh Piggot style systems use a pipe in a pipe (each capped) as a bearing. Both...
And it works so well. Because the turbine moves back and forth, you might be surprised at how little twisting actually occurs. We pivot on a set of motorcycle...
Hi Ferrand and All, ... While counter rotating windgens are more eff if designed right, they are always more expensive and require more maintainance per unit...
I live in north west Ohio, ice storm today and i thought how would this generator do in this type of weather. so if anyone has any feed back i would like to...
We run ours in northern NY, above Watertown. They work great in ice and snow. If painted black, the sun will melt off any icing up. ... From: "hiburd28"...
Video of a commercial wind turbine being destroyed by high winds Very cool. Brian http://www.filecabi.net/video/84815-f9b1.html -- Brian Rodgers All Internet...
Jerry, For smaller WT's where a gearbox is not required clearly contra rotation will probably not compete. However for higher power ratings where gearboxes...
I checked out his page briefly... its a very small unit... engaging a very small amount of wind area... small intercept area=small or tiny E available to start...
memo to me.... Do NOT stand near wind turbines in a storm........ BTW, I heard the thing wind up and then a click as it fell apart. Did a rotor blade fail...
Hi All, A couple months ago I saw an article in the Tampa Tribune on a guy building windgens. I though probably another off the wall nut but since it mentioned...
Over on Fieldlines forum they slowed the video down and noticed that one blade came apart first and hit the tower ... -- Brian Rodgers All Internet traffic...
It's kinda like tug-of-war - if one side lets go, the other side immediately falls down. All it takes is the loss of one blade to cause the whole thing to fly...
From previous posts on another thread about this failure, its my understanding it was being, or getting ready to be, serviced... for a faulty over speed...
I live in north west Ohio, ice storm today and i thought how would this generator do in this type of weather. so if anyone has any feed back i would like to...
In Colorado we rarely have ice storms. But - if the machine stops turning and you do get an ice storm (or snow that melts/freezes in the alternator) it's not...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
