Powerful magnetic force from an electromagnet,

[Hol]

Is it possible to produce over 1000 lb of magnetic force over a distance of 4 inches, using an electromagnet?
How difficult would it be? Explaining the general spec's of such an electromagnet?
And most importantly, the most expensive part of all the power input... How much power would this electromagnet need? A few kWatts?

 

[EdStainless]

It is possible, but probably not practical.
4" is a very long distance.

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Plymouth Tube

 

[IRstuff]

Do a websearch for junkyard electromagnet

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

 

[Hol]

@EdStainless, could you explain why it would be in detail?
@IRstuff most of those electromagnet's forces are rated at 3000 lb + at direct contact, and 90% of that force is dropped with a gap that is 0.1"... Yet they don't consume a lot of power, I assume by increase P from 200W to 2000W the results would easily show.

 

[Hol]

@EdStainless, why is it not practical?
Please do explain.

 

[Hol]

Could this calculator be reliable?

 

[Hol]

There is more explanation from this link that makes me consider this to be reliable but not sure...
Source.