1

General Science / Re: How to calculate fan power - formula?

« on: 05/05/2018 21:18:10 »

Hi @alancalverd
Thank you for your reply. This is a high science for me.
I do not know enough about all the relevant values or elements to know how to calculate the power.
Can you tell me, which option in the image above (upper or lower) has stronger power rotation.
Thanks in advance

2

General Science / How to calculate fan power - formula?

« on: 05/05/2018 08:30:56 »

How can I calculate fan power in these two cases?

The first case is direct wind speed of 10 m/sec.
The fan diameter is 40 cm. The fan housing is shown in the figure.
How to calculate a number 'rpm per second'.

The other case is when the housing is a cone and the fan is 20 cm in diameter.

How to calculate the rotational strength?
In which case is the power of rotate higher?
Is there any formula in the calculation?

I found some formula P=1/2*p*a*V3
 [ Invalid Attachment ]

3

Physics, Astronomy & Cosmology / Which magnet has the strongest magnetic field at its North pole?

« on: 27/10/2017 10:27:21 »

Which of the magnets in the image below has the strongest magnetic attraction on the North pole (in order).
I think the order follows (B, C, D, A)
With magnet 'A' the thickness exceeds the diameter dimension (thickness may weaken its magnetic force on the poles)?

Am I right?


magnets-power.png (18.23 kB . 1092x733 - viewed 2252 times)

4

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 18/10/2017 19:32:47 »

Could you please repeat the iron filing experiment, but first show us the magnet, then put the paper over the top, and then show the iron filings pattern?

I was expecting your comment

5

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 14/10/2017 18:34:14 »

Do you mean this video?

That's that video. I asked the question (in comment) but I did not get the response from the video author.

He also shows how you can shield a neodymium magnet.

How much do I know about this video by using the author "Ferrite magnet"?

Ryan Walsh - 7 months ago
Hello Sir. Nice presentation
Would you be able to tell me the type of magnet that was used. Was it a N-52.. or something less.
I bought and Received the material today from your company.

Author: LessEMF - 4 months ago
Ferrite

I think in a single comment (Ryan Walsh) read the question and answer, am I right

Could you please repeat the iron filing experiment, but first show us the magnet, then put the paper over the top, and then show the iron filings pattern?

On this URL link I've set up a video on your request.
www.youtube.com/watch?v=UoGLhb7lLm8&feature=youtu.be

6

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 12/10/2017 20:38:44 »

The diagrams are incomplete.

It's just an experiment.

Nobody  did not answer on my question in post #17. Is there anyone in this forum have of real experience with "lessEMF"?

7

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 07/10/2017 16:05:35 »

How large is the magnet in your final project

Neodymium disc magnets 6 pieces connected to the stack.

Sprinkle iron filings on the paper, and tap it until they form into lines

As I promised, you can see everything in this video
https:// www.youtube.com/watch?v=myqCHp22nGU&feature=youtu.be

I'm interested in the following:
Can a 'lessEMF' magnetic shield (on youtube there is video), prevent magnetic field strength from neodymium magnets?
Does anyone have any experience?

8

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 04/10/2017 13:58:43 »

That's not a monopole.

I do not claim to be a monopoly magnet. It's just an object that prevents the other pole magnet from acting outside the magnetic shield. Thus, the object behaves like a monopoly magnet.

Please do this experiment:....

I will do it in the next few days

9

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 03/10/2017 17:43:11 »

I am admittedly curious as to what would happen if you constructed a shielded magnet like the type shown in post number 6. Would the magnetic field stop working altogether?

Hi Kryptid
I want to inform you. I made a magnetic shield around the magnet, in fact I made a single-pole magnet.
You can see the video on a link (if I do not violate the forum rules by placing a link and if the moderator does not delete the link).
https:// www.youtube.com/watch?v=TDqz3eqjI5g&feature=youtu.be

10

Physics, Astronomy & Cosmology / Re: How is magnet size and shape calculated to provide a given magnetic field?

« on: 28/09/2017 11:25:53 »

I think you will need to leave an air gap between the poles otherwise the field extent will be minimal.

I have taken into consideration the air gap. At the moment I have purchased a metal sheet of stainless steel, also known as INOX steel.
I'll try to make several layers separated by plastic material.

11

Physics, Astronomy & Cosmology / Re: How is magnet size and shape calculated to provide a given magnetic field?

« on: 27/09/2017 07:51:33 »

My inventions over the last 5 years:

Very impressive and captivating. Your knowledge is astounding. (I hope I have written well English)
Can you answer, to my questions on this forum.

I designed when I was a child. I know now that it would not have worked.

All is OK, but probably this was many years ago.
Today is: new time, new materials, new knowledge, new technology, etc.
This is the key to possible solutions that I want.
link: https://www.thenakedscientists.com/forum/index.php?topic=71465.0

12

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 25/09/2017 09:26:41 »

If you are trying to make a "magnet" with just one pole then you are wasting your time.

No, I do not want to make a single-pole magnet. I just want to prevent the magnetic field out of the shield.

Would the magnetic field stop working altogether?

And I'm interested in that

13

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 24/09/2017 19:41:37 »

No, I do not want to send a magnet anywhere.
I want to block the magnetic field.
I want to construct two separate magnets as shown below


bms.png (40.77 kB . 500x444 - viewed 10018 times)

14

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 24/09/2017 09:11:27 »

I've found on YouTube some video presentations with materials like Giron and Mumetal. (I do not want set link to here, I do not violate the forum rules, but if the moredator permits me I will include a link to youtube)
Since there are a lot of false (fake) presentations there, what do you think about these materials?
Is it worthwhile to buy these materials (especially Giron that advertises on youtube)

15

Physics, Astronomy & Cosmology / Re: Is it possible to make a shield to block a magnetic field?

« on: 24/09/2017 08:05:20 »

You have to make sure that the metal does not saturate, so it will work as long as you aren't using extremely powerful magnets

Thanks for the advice.
Do you mean a neodymium magnet grade N52 or N50M.
Will it the steel sheet or iron plate, successfully have effect on the said magnets?
btw: I have a galvanized sheet metal.

16

Physics, Astronomy & Cosmology / Is it possible to make a shield to block a magnetic field?

« on: 23/09/2017 13:40:43 »

Can anybody tell me, is there a chance to make a shield from a magnetic field?
If there is a possibility, what materials should I use?


sh.png (81.75 kB . 472x539 - viewed 13282 times)

17

Physics, Astronomy & Cosmology / Re: How is magnet size and shape calculated to provide a given magnetic field?

« on: 23/09/2017 13:38:05 »

You could use a datasheet like this one to calculate some of these factors.

Thanks for the link. I'll try to calculate.

18

Physics, Astronomy & Cosmology / Re: How is magnet size and shape calculated to provide a given magnetic field?

« on: 23/09/2017 07:01:14 »

Everything is OK. But, I'm a total ignorant of the science of magnetism.
I need a concrete answer.
(I did not buy magnets yet. I want to first calculate the dimensions, and then buy the magnets.)
What size should be (dimensional, volume and weight) of magnets of the same characteristics to raise up the weight of the 'C' magnet.

Can the magnet of these characteristics lift up its weight (see the construction in the first post)

Example 1
Neodymium magnet grade = N52 (or N35 or N48 or N50M)
L = 21mm
W = 21mm
T = 30mm
Weight = ?

Example 2
Neodymium magnet grade = N52 (or N35 or N48 or N50M)
L = 26.93mm
W = 12.53mm
T = 30mm
Weight = ?

Does anyone know the answer to this question?
My respect to all the scientists.

19

Physics, Astronomy & Cosmology / Re: How is magnet size and shape calculated to provide a given magnetic field?

« on: 22/09/2017 14:29:34 »

I want to find out what kind of magnet 'A' and 'B' I have to use to raise the magnet 'C'.
I want to calculate dimensions, strength, 'A' magnets to raise the weight of the 'C' magnets.
I want to find the strongest option if all the magnets have the same characteristics.

20

Physics, Astronomy & Cosmology / Re: How is magnet size and shape calculated to provide a given magnetic field?

« on: 21/09/2017 20:35:38 »

Hi Kryptid
Thank you for the link.
Helps, but not completely.