Recent content by leviterande

Hi, I have done some more extensive experimentation on the subject with various flying models. I am going to present the results once I am finished soon. Data on such configurations are pretty much non existent on google. Let me just say I am a little surprised by my contradicting results...

Hi! I have had this question for ages, nearly impossible to find anything on the web. My experiments confused me even further! Its concerning the blockage effects of surfaces ahead of a propeller. For example let's consider the usual dual vectoring propellers on the sides of airshipcars like...

Dear boneh3ad, admittedly yes I know that this last example may look very different, but I wanted originally to consider this last example to show the same point I have in mind, namely the wake drag portion behind the plate. I understand that the air coming from the front and around the...

Indeed, in accelerating frames things get different. However I am luckily only talking about constant speeds:)(at least I think I am thus far hehe) I feel that my exact point was probably not clear so I am going to use an extreme example (possibly inappropriate but should show the point )...

I feel that what I wanted to know, the issue in question, seems -despite what I wrote- to not have came out clear. I understand that the situations should be the same but I want to understand how, how the air directly behind is the same for the 2 situations. To illustrate my point even...

I appreciate your replies. I understand that the 2 situations should be the same, -a fact you have made clear- I just don't grasp yet the how; how the two wakes are identical. it seems my exact question wasnt clear. My current understanding of negative...

Your words are clear. Obviously though, the subject is more clear to you than it is to me, a fact which may make you bypass some things that may be regarded as straightforward to you but not to me:). Happy shopping btw, (hope its not too heavy on the wallet hehe). In both cases then there...

(Of course I realize that the two wakes of the two situations ought to be identical somehow, but how? ) I have considered and imagined several frames of reference. But still I don't understand how the air in the wakes would be similar. I outlined my thinking in the earlier posts.

Sorry, perhaps the word rarefied was not adequate, what I mainly meant was that the air flow directly behind the moving plate seemed different than behind the stationary plate. Ok, let's see, I am moving with the moving plate, let's say I am at the center of the plate area and looking now...

Hi All! See the picture. A-Consider a flat plate physically moving perpendicularly through the air. B-Consider this same flat plate sitting perpendicularly and stationary now in a wind tunnel where air is made to flow. Accordingly if airspeeds, areas etc are similar, the 2 situations...

With all due respect I am not sure how much you are aware about the vast and various research and results concerning CCW, active Upper surface blowing and-or trailing edge blowing/circulating, basically active circulation. (Pardon me if in any case got you wrong). CCW research indicates...

Yep,a blunt trailing edge alone w/o blowing allows more lift at cost of drag. I was headed towards the various options to get that even extra lift with the various active circulation methods. I am currently trying to finding out information about lift calculations of rotating...

I am reading as usual as much as I can to learn more about this specific subject. I have found lots of papers but not specifically related to the problem. However, recently among my research I have discovered,-- if I am not wrong-- that upper + lower blowing wouldn´t affect lift, in...

Hello everyone! I am interested in roughly calculating the lift from an airfoil that has air circulating around its full circumference, (can be done by a treadmill skin but probably best done in practice by blowing air from slots around the entire circumference as seen in Fig.1) As...

Excellent! Understood and makes sense as I originally thought. Now however, it seems (unless I hopefully misinterpreted boneh3ad) in post #9, that his conclusions to be opposite to yours? ha? I interpreted from post 9 that lift would occur on a manhole plate just because there is a parallel...