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Surfeurseb
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by Surfeurseb » 29/11/08, 13:02

Thank you Olivier for the demonstration!

Congratulations to you for your comprehensive attitude to this experiment!

Looping in: you practice an aviation activity?
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esgege
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by esgege » 29/11/08, 13:48

So why not something like that?

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Remundo
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by Remundo » 29/11/08, 19:26

bpval wrote:But BORDEL ... Where are the experts

Marcel
Pascal
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Must stop the carnage
These videos are to be taken into account ... of course

But from there to say .... I'm going faster than you push me

Ah ... I understood that it is quantitic indeterminism

Good MARCEL if you're listening ... REPONDS !!!! (thanks ...)

Hello


Hello everyone,

This little subject may have a connection with the RobiMov'It ... who is facing the wind.
http://video.google.fr/videosearch?q=RO ... mb=0&aq=f#

Y'en others who carried out the experiment in mini-boat, for example:
http://www.youtube.com/watch?v=NNbNNSDljGI

Pascal HA PHAM asked me for a study on this phenomenon during October 2008.

The study is over and I just got the green light for the publication.

Here's the link:
https://www.econologie.info/share/partag ... kBI6d5.pdf

To summarize ... It is quite possible to advance against the wind with a wind turbine, especially for a land vehicle, but also for a well profiled boat, without disavowing any law of classical physics : Idea:

Soon online on the SYCOMOREEN website, in English :D

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bpval
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by bpval » 29/11/08, 21:04

Oh oh strength of love ῷӁϠ 佼 厳 戒

Yeah, move forward facing the wind, with my little head I can imagine it,
but Remondo is going faster than him, downwind

And I dry

The original video shows a vehicle (not food low
-côtés ... because it is remote : Shock: )
and that goes faster than the wind

Sorry ... but I'm a bit dropped :x Ouu
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Olivier22
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by Olivier22 » 29/11/08, 21:09

He takes advantage of the relative wind he creates to achieve a faster wind, which he uses wisely.
That's what I wanted to explain in my demonstration but not clearly enough :?

Energy level there is nothing aberrant, it is the principle of a multiplier of speed.

Or, we can say that the propeller advances in the air at the same speed as the carriage advances on the ground (with the output near), and the difference is the wind, this is where the energy which allows to compensate the "to the nearest output".
Last edited by Olivier22 the 29 / 11 / 08, 21: 18, 1 edited once.
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by bpval » 29/11/08, 21:18

Olivier

I conceive your rhetoric
I'm not saying that it can not work
Wind back ... faster than the wind
A video does not convince me
Name me THOMAS

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by Olivier22 » 29/11/08, 21:21

(I edited my previous message)

I suggest you make a model in this case, if you can afford it, it will be very fun and impressive.
Me I would be a real car wind turbine, one day! With a steerable propeller and a pitch adjustment to be able to roll in any direction relative to the wind ... A dream among others ...
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by bpval » 29/11/08, 21:25

Pascal

I know that you are on many projects ... (and wholeheartedly with you)
But what do you think about it? Image

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by loop » 29/11/08, 21:32

Hello

Looping in: you practice an aviation activity?


Right, I'm glider pilot and glider and also Autoconstructeur a small wind turbine.

In spite of everything, I recognize that the aerodynamic phenomenon that applies to these propeller carts is difficult to assimilate intuitively.
I believe that wind should not be taken into account as an external driving element, and in the first case, it serves only to reduce the friction of advancement.
It's more visual with the treadmill.
Just a note about the design, I will have placed the propeller at the front of the cart so that the traction realigns it in the axis of advance and not at the back because the thrust creates a directional instability.

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by Olivier22 » 29/11/08, 21:45

loop wrote:thrust creates directional instability
Did you see it on a flying machine?
This is a question I have always asked myself about propellant propeller planes (duck or not); it seems intuitive enough except that the thrust remains in the longitudinal axis of the machine whatever happens. Can we then speak of instability since no moment of yaw is created when it is removed from its path?
Whether the propeller is tractive or propulsive, the yaw balance would be the same: indifferent.
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