Mr Lester J Hendershot's magnetic generator.

[s e t h]

circular coils with caps in the middle remind me of this pdf http://www.vixra.org/pdf/1005.0078v1.pdf

[john_g]

Flux Valve

Hi

Thought this may be of interest of how an aircraft flux valve works.

Heading Indicators (Part Three) The Flux Gate Compass System

Note that ac is used to 'reset' the cores.

Regards

John

[GSM]

nice

http://www.hyiq.org/Library/Download...Hendershot.pdf

Thanks - much clearer than many pics/texts I have here.

[wings]

nice

http://www.hyiq.org/Library/Download...Hendershot.pdf

[ChrisW]

My "bad"

Graham,

My apologies -- it wasn't my intent to mock or otherwise distract from the main point. I wasn't sure if you were familiar with that particular story. From the plane image you posted, it appears that either technique might have been used. I am aware of another, similar design that utilizes coil *pairs* and clever switching to achieve a the same goal.

Chris

[GSM]

Graham, oh dear Graham...

It appears incumbent upon me to lend you a fork.

From the news article dated February 26, 1928, found on the Hendershot page at RexResearch.com:

[emphasis added]

Also, see the motor illustration here:
Lester J Hendershot - The Hendershot Motor/Fuelless Generator - Hyiq.org

Take particular notice of the RING MAGNET, its polarization, and the COILS. Hint: More than one coil is active SIMULTANEOUSLY. Like, pairs, ya know?

I concur that only so much can be gleaned from ANY patent. Getting to the "beef" requires one's intuition and intellect to work together as one.

Re: the parametric stuff, I definitely think it's related... a sudden change of inductance is almost certainly involved.

Now then, let's see how much "tinkering" I can get done between now and Monday morning...

Chris

P.S. Steve220 -- Thanks!

P.P.S. The illustration at HyIQ is NOT Hendershot's -- but Lester admitted it was "damn close" to his design.

Hi Chris,

It is sad to see your mocking attitude when all here are either trying to understand or replicate prior technology; such posts merely distract from sensible factual communication, discussion and continuity.

In your link you make bold emphasis as if I am unaware it is written -"Hendershot said he had succeeded in winding it in such a way that it draws energy directly from electrical currents which exist constantly in the air or in the ground.".
Just because I don't mention something does not mean I don't have prior knowledge of it, and thus I often advise folk that "He who makes assumptions without first checking - can make very big mistakes".

Are you assuming that I had missed reading that,
or are you assuming that this did not relate to his automatic compass related investigations,
or are you assuming there had been a stand alone motor without generator - which is not something I have seen stated anywhere ?

As I wrote - there is NOT enough information written within Hendershot texts for me or anyone else to exactly copy his motor, so if there is some detail about his motor you have understood then I am sure that more than myself here would be pleased for you to communicate it with us.
(This being quite apart from the fact that my stated interest here is in the Mk1 to 3 electromagnetic generators only.)

The notes I have read about Hendershot motors relate only to him having rewound already existing conventional motors in order to make them more efficient, or to his utilisation of the magnetised claw stators with his specially wound rotor to utilise the alternating output from his Mk1 generator. Here Hendershot's drawing clearly states that his special rotor had a *split* metal core, as indeed are the rotors of similarly principled 'modern' alternators used today. It is possible Hendershot got there first, and that the military, as they so often do, commandered his design.

As you say, that HyIQ link is not Hendershot, and most certainly any 'motor' thus based could not have been made so small as to fit into his original toy plane. See link. Hendershot's prowess was in imagineering the synchronous generators capable of driving split rotor motors at fixed speed, including his large Mk1 version constructed at the air base said to have powered a 60HP motor for two days without showing signs of degaussing the magnets.

Notwithstanding, I wish you genuine good luck with your 'tinkering'.
Indeed I am so curious about the Mk3 mutual inductors having 'tin can' cores that I will be winding coils to investigate core energisation and resonance with both shorted turn and longitudinally split options.

Cheers ........... Graham.

[ChrisW]

Beef!!

Graham, oh dear Graham...

It appears incumbent upon me to lend you a fork.

From the news article dated February 26, 1928, found on the Hendershot page at RexResearch.com:

"The demonstration was very impressive", Mr. Stout said. "It was actually uncanny. I would like very much to see how a large model designed to develop power enough to lift an airplane would operate".

Mr. Stout said the model he saw was about the size of the tiny motors used in vacuum cleaners.

"I was told that the revolutionary feature was a hereto unknown manner of winding the armature", Mr. Stout continued. "Hendershot said he had succeeded in winding it in such a way that it draws energy directly from electrical currents which exist constantly in the air or in the ground. Such sources of cheap and inexhaustible power, of course, never have been reached before. The small model appeared to operate exactly as Hendershot explained that it did".

[emphasis added]

Also, see the motor illustration here:
Lester J Hendershot - The Hendershot Motor/Fuelless Generator - Hyiq.org

Take particular notice of the RING MAGNET, its polarization, and the COILS. Hint: More than one coil is active SIMULTANEOUSLY. Like, pairs, ya know?

I concur that only so much can be gleaned from ANY patent. Getting to the "beef" requires one's intuition and intellect to work together as one.

Re: the parametric stuff, I definitely think it's related... a sudden change of inductance is almost certainly involved.

Now then, let's see how much "tinkering" I can get done between now and Monday morning...

Chris

P.S. Steve220 -- Thanks!

P.P.S. The illustration at HyIQ is NOT Hendershot's -- but Lester admitted it was "damn close" to his design.

[GSM]

Greetings Graham,

I think you missed the "beef" about the motor coils -- "magnets with specially wound coils" -- but no worries, the motor is not our target.

Good find on the Naudin site; I'd forgotten about much of that work, and my head wasn't in the right space at the time, anyway. One page I found quite interesting:

PARAMETRIC POWER CONVERSION

Read it carefully and look at the schematic -- eerily reminiscent!

@wings -- thanks for the links -- brain food.

@john_g -- yeah, it's that magnetic "snap back" (realignment to a natural state) that seems to be at the heart of all this.

Chris

Hi Chris,

'Beef' ? There are not enough facts revealed about the motor to stick a fork in.

Besides, the points I had been making were not about the motor, but about the Mk1 generator empowering it; ie. I was reasoning how the Mk1 was most unlikely to have had a 50-60Hz output, and I was also puzzling about the lack of T18 and T27 central cores within the oppositely sensed output windings.

When people write Patents they often leave out some crucial detail, so that replicators cannot succeed. Suppose that with the Mk1 plans, Lester 'forgot' to mention that within the L19 and L25 output windings there needs to be placements of paper gapped 'N-S' magnets, such that transformer cores 18 and 27 become alternating generators as a result of to 'E-W' variation via L22 and core 23.

Regarding that version of Parametric Power Conversion - granted it looks strikingly similar, with series 'C' and where 'R' could be a lamp, but it operates as stated only with a low Z power drive; ie. switched between DC power rails. Will it run the same with magnetic buzzer impulses ?

Cheers ........... Graham.

[GSM]

Mechanical filter repair

R-390A mechanical filter repairs

Good info in those links Wings - especially this in the repair article -

Re the coil winding -
"The coil is wound in two sections using three insulating washers, two as cheeks and one as the central partition. There is no coil former; the coil is self supporting. You may want to count the turns on your coil to see if you get the same answer as me. I think there are 610 turns of 0.071 mm (0.003") enamelled copper wire per section. The real interesting thing is that the phase of the coil reverses at the centre. So you wind 610 turns, cross the centre partition and then wind 610 in the opposite direction."

and then later about the fine vibrating actuator wires -
"The little magnetic wire is not working as a piston; it is being alternately stretched by one coil and compressed by the other. I am only guessing but I suspect that the spacing of the two coils is related to half a wavelength of bulk acoustic wave in the wire. So the phase reversal is the key."

This being what could be happening with a central null region around the stainless steel coil cores of the Hendershot Generator ?

Hi John,

I've still got to get my head around the texts in those links, for they are obviously food for thought in relation to the Mk1 generator.

Cheers .......... Graham.

[Steve220]

Greetings Graham,

I think you missed the "beef" about the motor coils -- "magnets with specially wound coils" -- but no worries, the motor is not our target.

Good find on the Naudin site; I'd forgotten about much of that work, and my head wasn't in the right space at the time, anyway. One page I found quite interesting:

PARAMETRIC POWER CONVERSION

Read it carefully and look at the schematic -- eerily reminiscent!

@wings -- thanks for the links -- brain food.

@john_g -- yeah, it's that magnetic "snap back" (realignment to a natural state) that seems to be at the heart of all this.

Chris

[ChrisW]

Similarities and common threads

Greetings Graham,

I think you missed the "beef" about the motor coils -- "magnets with specially wound coils" -- but no worries, the motor is not our target.

Good find on the Naudin site; I'd forgotten about much of that work, and my head wasn't in the right space at the time, anyway. One page I found quite interesting:

PARAMETRIC POWER CONVERSION

Read it carefully and look at the schematic -- eerily reminiscent!

@wings -- thanks for the links -- brain food.

@john_g -- yeah, it's that magnetic "snap back" (realignment to a natural state) that seems to be at the heart of all this.

Chris

[wings]

Hi Chris,

This was in my Army/ Air-Force R390A operators manual. Circa 1960 these were 'top secret' $2,000 miltary communications receivers. They still remain one of the very best receivers for discriminating weak distant signals through RF noise, and were forerunner to quality commercial 'amateur' gear.

This drawing appears to be from 1953.
For radio purposes many slightly different machined discs having a range of resonant frequencies were positioned in line between the sending and receiving transducers in order to provide a low amplitude ripple 'flat' top reception bandwidth.

*!* Hendershot must have had US forces contact for him to be able to obtain a magnetron magnet, for these must have been a military secret at that time.
He was likely very clever and technically well read, but never disclosed anything for fear of overstepping his oath to secrecy-
that is -
until April 1961 when he said he would explain his generator, and within days was found dead !

Cheers ............ Graham.

Mechanical filter
http://collinsradio.org/archives/ser...-1_SB_2rev.pdf
Mechanical Filters
Collins Radio Service Bulletins and Information Letters | Collinsradio
Rockwell/Collins Mechanical Filters
Mechanical filter - Wikipedia, the free encyclopedia

repair
R-390A mechanical filter repairs

The Hendershot Motor Mystery

[john_g]

Inductor Compass

Hi All

I read that Hendershot's device was inspired by the Inductor compass - just wonder if that may hold some additional clues for the operation of his device?

Some details:


http://s3.ptodirect.com/2370194.pdf

[url=http://www.jstor.org/stable/pdfplus/984431.pdf

http://www.freepatentsonline.com/1047157.pdf

Regards

John

[GSM]

Mechanical Resonator.

Hi Chris,

This was in my Army/ Air-Force R390A operators manual. Circa 1960 these were 'top secret' $2,000 miltary communications receivers. They still remain one of the very best receivers for discriminating weak distant signals through RF noise, and were forerunner to quality commercial 'amateur' gear.

This drawing appears to be from 1953.
For radio purposes many slightly different machined discs having a range of resonant frequencies were positioned in line between the sending and receiving transducers in order to provide a low amplitude ripple 'flat' top reception bandwidth.

*!* Hendershot must have had US forces contact for him to be able to obtain a magnetron magnet, for these must have been a military secret at that time.
He was likely very clever and technically well read, but never disclosed anything for fear of overstepping his oath to secrecy-
that is -
until April 1961 when he said he would explain his generator, and within days was found dead !

Cheers ............ Graham.

[GSM]

Just came across this -
PARAMETRIC POWER CONVERSION - by JL Naudin

I'm still thinking about second resonant HF phonic oscillation of the core about a half length null point (hence L1 being centred over one core half), plus the buzzer alternating oppositely phased LF pulses between both cores, thus with waveforms just like those in this 1997 created page !!!!!

If this is the nature of resonant amplification within the Henderson Mk3 (coincidentally peaked electrical circuit wave plus material domain magnetic wave resonances), then the C1 capacitor could be mounted externally to the tank coil assembies and thus be fixed capacitors parallelled with say a 3 gang 500pF variable tuning adjustment per coil.

Cheers ....... Graham.