Howard Johnson linear track accelerator video

[corona]

That to me is a very non-convincing video. We never actually see the gate pull the cart in, it's always being held by HJ. When he's showing the scale that's apparently of it being pulled in, you never see that it's the cart on it's own pulling, he could be just pushing it.
And the rest of the video, he's always got his hand on the the cart until it's inside the gate, it never pulls itself in, 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.
It actually looks in a few points that he slips as it moves towards gate and it jumps back towards him, like it takes quite a bit of force to get it in.

Andrew

[hartiberlin]

, 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.

[corona]

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

[hansvonlieven]

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

[broli]

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.