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Mark wrote:And even more fun, where is thrust generated in a tornado or hurricane, there's no solid duct whatsoever, a really real valveless? ha
Mark

The surface of the Earth. Net thrust tangentially to a vortex is zero but the axial velocity in the core is vertical.

even though I was wearing good ear muffs, I noticed my ears might have picked up some other frequency even though the muffs seemed to cancel out any loud noises. Bone vibrating sound :!: It's conducted to you ears by your jaw. Your ears can't translate it into nerve impulses but it is shaking the h...

Sorry about the misunderstanding Mike. I searched through past posts by Mark and found the link you mentioned. it's in the "Big Fat Chinese Shoots Super Sonic Shockwaves!!!!!!!!!!!!!!!" thread, in the valvless forum. There are several links in a few messages, faaaascinating! I really like the one th...

BTW Bruno, the link that Hank gave is to the delta page the 'Vortices for Dummies' page is called "Anatomy of a vortex". I see that the back arrow on that page has a broken link so here's the link to the index page: http://users.acsol.net/~nmasters/vortex-lift/index.html As I'm sure you'll notice it...

Mark posted the link of colliding vortex rings a few days ago. i've got to run or I'd look it up... sorry. It is not colliding vortex rings it's a toroidal vortex created by a puff of smoke ejected from a tube i.e. a smoke ring. The cross section of the smoke ring is made visible by a light sheet. ...

Since you seem determined to glue it to the desk why not mount it upside down and fly small paper models in the airstream? Viola, electrically powered vertical low Re wind tunnel :-)

Glad somebody liked it. I usually get shouted down and/or called names by the faithful when I point out that there is a simple physical explanation for their miracles. Not too long ago one of them even called me "Mr. zero tolerance". Never mind that I'd tolerated his nonsense for 7 years before I fi...

Do you know of a reputable source on those things? The ones I have found are all run by 'believers'. I'd really like to learn about the effect from someone who is not into wishful thinking. Yeah the "antigravity" angle gets a bit irritating. People like Jean-Louis Naudin are taking advantage of the...

Mike Everman wrote: 4. We are not intellegent, just good input randomizers.

Ah... But the fact that we can recognize our own ineptitude indicates some small ability to select good outputs from the randomized inputs

Sounds good, but how come I have never used Wikipedia in my life? ... Mind you, I have nothing agains; I'm not being obstinate; just curious. A wiki as a collaborative system that allows users to create and update pages on the site with a minimum of supervision. Users can even update pages that wer...

Don't overlook the fact that gasses experience centrifugal force the same as solids except that compression and expansion move heat around. You've got the outer track labeled "low pressure" and the exhaust "high pressure". That's just not the way vortices work. The centrifugal force compresses the o...

Well, isn't suction just a form of blowing? Actually, no. Blowing adds material and energy to the boundary layer. Suction removes the boundary layer and the free stream material that moves in to form a new BL brings energy with it. Blowing is used to increase lift while suction is used to reduce dr...

This interesting paper concerns flow in an incompressible fluid. Any obstruction in the stream will shed vortices but a deltoid shape is an excellent vortex generator for compressible and incompressible flow. The problem will be keeping a sharp leading edge in an environment where you have thermal,...

To me, this sounds like the Coanda effect being utilised. - ville It sounds like suction boundary layer control to me. But I'm often wrong. Care to enlighten me? The relevant patent numbers are: US Patent No. 5,417,391 Russian patent, date 14.10.1991, No. 2015941 And for your convenience the USPTO ...

The people actually involved with the project haven't published very much so most of what you can read about EKIP is uninformed speculation. There are several suction slots in the aft upper surface as shown in the attached drawing. As I understand it the idea is to get a vortex stabilized in each on...