Topic: Howard Johnason linear track accelerator video (Read 3990 times)

hartiberlin · « **on:** March 29, 2009, 11:15:29 AM »

Hi all,
I got a link from a friend, where you can download the Howard Johnson
Linear track accelerator video.

It is from 1994 showing Howard Johnson
with a waggon with 2 or more ? Banana magnets going through a magnetic gate
with no repelling force and 12 pound thrusting force ( Measured via a scale)
and then being accelerated out off the gate and crusing along for a few meters.

This is a very interesting video and in the recent success of Mylow´s setup it is
very desirable that everybody should see this.

Here is the download URL:

http://rapidshare.de/files/46408889/hj01.avi.html

You must first click on FREE
and then wait about a minute for the download counter and then can click the download
button.

Then a question comes up for the 3 digit code, that you must look at and enter into the form,
where it says:

Kein Premium-User. Bitte XXX hier eingeben: and you enter this 3 digit code.

Then it will download.

It is about 15 Mbytes big and uses the DIVX Codec and MP3 audio in it.

Enoy !
Regards, Stefan.

« **on:** March 29, 2009, 11:15:29 AM »

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hartiberlin · « **Reply #6 on:** March 29, 2009, 12:40:20 PM »

Quote from: corona on March 29, 2009, 12:26:12 PM

, ie it looked to me like a typical smot gate, where you get it past the sticky point by hand and then it thrusts out happily.

Andrew, a SMOT does not have a sticky point at the entrance, cause you use a steel ball which is
always attracted into the SMOT gate.

Build yourself a SMOT then you will see it.

With Howard Johnson´s design this might be a bit different, as he uses magnets
on the runner waggon.
So it is a bit repelled,but not much, as you can see in this video but has a
pretty good velocity out of the gate.

So if he would put put a few gates after each other, the runner waggon could go on an on.

Although it would be much easier and cheaper to just use a few iron plates onto the track rail
and use only a few magnets inside the waggon to get crusing along as I have
an idea how to do this...

Regards, Stefan.

« **Reply #6 on:** March 29, 2009, 12:40:20 PM »

corona · « **Reply #7 on:** March 30, 2009, 12:54:55 AM »

Ah yeah of course, my bad, it's been years since I built a smot and I was mixing it up with the other magnet motors I've built. But I still stand by my earlier opinions, with regard to most magnet motor designs having a sticky spot being their only undoing. That video never shows to me the lack of sticky spot, it looks rather deceptive.
I'll continue with my myloo motor replication rather than look too closely at these older HJ videos, I don't really think he got very far with his linear designs.

Andrew

« **Reply #7 on:** March 30, 2009, 12:54:55 AM »

hansvonlieven · « **Reply #8 on:** March 30, 2009, 01:17:25 AM »

In Johnson's book The secret world of magnets he shows the construction of his gate. The drawings below are from his book.

1 shows the arrangement of the 4 ceramic bar magnets magnetised through the thickness.

2 shows a circular rubber magnet also magnetised through the thickness.

3 shows the completed assembly.

Howard claims that this arrangement accounts for its asymmetric behaviour. In the video he shows three such assemblies in line.

Hope this helps

Hans von Lieven

« **Reply #8 on:** March 30, 2009, 01:17:25 AM »

broli · « **Reply #9 on:** March 30, 2009, 01:54:29 AM »

Quote from: hansvonlieven on March 30, 2009, 01:17:25 AM

In Johnson's book The secret world of magnets he shows the construction of his gate. The drawings below are from his book.

1 shows the arrangement of the 4 ceramic bar magnets magnetised through the thickness.

2 shows a circular rubber magnet also magnetised through the thickness.

3 shows the completed assembly.

Howard claims that this arrangement accounts for its asymmetric behaviour. In the video he shows three such assemblies in line.

Hope this helps

Hans von Lieven

I made a 3d rendition of this setup to make things a bit more clear. I also believe that two opposing ring magnets can replace that pretty rare radially magnetized ring magnet.

« **Reply #9 on:** March 30, 2009, 01:54:29 AM »

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hansvonlieven · « **Reply #10 on:** March 30, 2009, 01:57:27 AM »

Broli,

As far as I know the corner pieces are NOT magnets as in your drawing.

Hans von Lieven

« **Reply #10 on:** March 30, 2009, 01:57:27 AM »

broli · « **Reply #11 on:** March 30, 2009, 01:59:18 AM »

Yeah I wasn't too sure about those. But then I saw that the outside of the ring was colored blue as well so I thought the blue indicated the south pole. Why else would he put them there. Either they are needed for the principle or they are just used to hold the 4 bar magnets together.

« **Reply #11 on:** March 30, 2009, 01:59:18 AM »

hansvonlieven · « **Reply #12 on:** March 30, 2009, 02:06:07 AM »

@ broli,

maybe there is nothing there at all in the built version or simple blocks of wood, which Howard uses a lot in some designs.

The rubber magnet is crucial, so he says elsewhere. He says that there is an interaction between magnets that changes character depending on what the magnets are made of. In some gates of his he used rubber and neo magnet sandwiches.

Hans von Lieven

broli · « **Reply #13 on:** March 30, 2009, 02:13:31 AM »

I thought rubber magnet as in it being able to bend. That's the only way I can think of for Johnson making such a radially magnetized magnet. But I have a lot of knowledge in these thing and below is an attached version that uses regular axial magnetized magnets to get the same field. You have to watch out though. If you truely want the same setup as him without magnet one should use two conducting hoops with opposing currents going through them. Then you will have the same setup but that relies on current again

. Also do you have an illustration of the magnets on the cart? I believe I can figure out how it works if I analyze it.

« **Reply #13 on:** March 30, 2009, 02:13:31 AM »

hansvonlieven · « **Reply #14 on:** March 30, 2009, 02:20:36 AM »

Just download the book broli and you can see for yourself what he says. I'll just quote the post of mine with the link here.

Quote from: hansvonlieven on March 29, 2009, 11:47:47 PM

G'day all,

Howard Johnson published a book in 2006 entitled The secret world of magnets. It is still in print as far as I know.

However, there is a copy of it on the net in pdf form. I don't know if this breaches copyright laws, I should think so, but never mind. It is fascinating and amongst other things explains the construction and workings of his gate.

You will find it here: http://www.scribd.com/doc/34317/Spintronics-The-Secret-World-of-Magnets-2006-by-Howard-Johnson?autodown=pdf Well worth the read.

Hans von Lieven

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Author Topic: Howard Johnason linear track accelerator video (Read 3990 times)

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