Black Widow V8 difficulty?

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And some more information that was posted in a model engine newsleter (attached):
 

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As I understand it, nobody has asked any questions about the Challenger engine, who designed it, or who owns the copyright to it.

The claim was made by a member here that he owns the copyrights to the Black Widow V8, or something to that effect.
Here are his exact words, so I don't misquote.

I don't advise this I am,the rights owner for the challenger all rights for the black widow are from this engine and were violated.
Gary martian does not have the rights or the designer that goes back to 1966

Don't. This is to all Dwight Giles and ken Hurst did this.
Posted by Member "casted".

Gary Martin said that he purchased the patterns and drawings for the Black Widow V8 from Dwight Giles, who was in partnership with Ken Hurst.

Gary Martin and our unknown member can't both own the copyrights to the Black Widow V8, so that is what we need to clarify.

If someone is the copyright holder for the Challenger engine, how does that also confer copyright ownership of the Black Widow?
Just trying to get clarification of exactly what we are dealing with here.
Please explain the situation.
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The Blackwidow was an improved Challenger so it has it's roots in that first design.

A bit like your 4HP hopper being an improved version of the PMD, you have used the PMD drawings for some details.
 
A bit like your 4HP hopper being an improved version of the PMD, you have used the PMD drawings for some details.
I have seen the PMD drawings, but all the details/3D models of my Ball Hopper Monitor come directly from photos either by Barney Kedrowski, or photos from Facebook, or from the Baker brochure, so your assumption is false.

My design has nothing to do with the PMD design; it is not an improved version of the PMD, it is an accurate representation of a full sized 4hp engine.
The PMD drawings are inaccurate in many ways to the original 4hp engine; even the sparkplug location, which is easily seen in photos of a 4hp engine, is shown in the wrong location on the PMD drawings.

My drawings are accurate to an original full sized 4hp Monitor engine, and derived from original photographs and factory brochures of a full sized 4hp engine.

I can print out my drawings and lay them next to the PMD drawings, and you can see that there is nothing in my drawings that has been taken from the PMD drawings.
My drawings are original, created entirely by me from photos and factory information, are unique to the world, and are visually accurate to the original engine (with the exception of perhaps the connecting rod end cap, which I modified to my design).
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