Howard Johnson Replication Tube Claim

[slapper]

The following image is a HS811N or very close.
From what I can tell it's about 0.14" longer than MyLow's iron stator magnet.
The compass doesn't really show the pole coming off the edge in this magnet as opposed to what MyLow showed with his.
The pole seems to be coming off some where in between the tangent line of the radius and the edge.
If I get a rig built I'll do some field strength measurements with my gauss meter.

Take care.

nap

[wattsup]

Here is a good resource on magnets, choose catalog7 here;
http://www.magnetsales.com/Info_R2.htm

@steve_chow

I am not ready yet to answer that "sticky" question.

I have asked Mylow on his last Utube video to try and do a test to lift as much iron as he can with his rotor magnet to at least get an idea on pull strength. May not be the best scientific way but could not figure out anything simpler or more precise.

If you look on page 49 of the above catalog, you will notice their channel magnets have pull going from 10 to 85 pounds. I want to wait and see if Mylow can give us an idea on his pull number.

There are so many types and sizes. One has something but lacks something else. One main criteria that I am looking at is the distance between the protrusions or the length of the cavity. The cavity has to be pronounced and in many offerings, the cavity is way to short to emulate Mylows. So I am still out on the rotor magnet question.

So there is the question of rotor magnet dimensions, cavity length and pull force and maybe once these have been decided then and only then can all these determine the actual wheel diameter and magnet spacings. If there are any math guys here that can work out Mylows'  rotor magnet and wheel relationships to come up with some magical formula, then this could be used to make any sized wheel. Hmmmm.

But I could not resist and just found a nice aluminum pizza pan 15.5" in diameter ($13cdn) that I will use as a first start build. I know it is smaller then Mylows by 2" but I will compensate with less rotor sets. I am plotting the positioning for that. I will probably use the lower part of a swivel office chair legs and shaft as the base. Like I said I want to approach this with baby steps and learn all the way through.

As for the stators you made, if they are magnetized through the length, they look really great and as Hans has said, like the HJ. I have tried to find stator magnets and have not found them yet. I am inclined to think that the most realistic ready made stator magnet will be a good size horseshoe magnet that I will have to cut the stems down to size to have a more wider field spread and still have that north/south through the width.

So I am still out on final choices. If Mylow can give us an idea on pull force of the rotor, this will give me a final direction.

wattups

[TheNOP]

http://www.keelynet.com/ohsako/ohsako.htm
I find all of it rather interesting, maybe it can help someone.

now i have the answares to my questions.
thanks.

good studies replicaters.

[robbie47]

A suggestion to Mylow to 'repair' his stator magnet in a simple way:

Just stick a small magnet at the back of the iron, in the center, north facing one end of the horseshoe, south facing the other end of the horseshoe iron.
I think this will extend the north and south pole to the end of the demagnetized iron

See attached pdf to explain my suggestion by a drawing of this principle

[corona]

It's not particularily interesting, but here's the first step of my replication.
http://www.youtube.com/watch?v=FBlruIyReRQ

Andrew