Solved -PJ672- J.S. Eastham's Light Car, 1929

[Paul Jaray]

Can you identify it?
Full details please...I know it seems easy. 
(no points for partial answers)

[oko94]

Is it supposed to be a flying car, shown here with its wings folded ?

[Paul Jaray]

Not at all...that is a sort of 'stabilizer'!

[oko94]

Made in Europe ?

[Paul Jaray]

Nope...

[oko94]

Made in USA ?

[Paul Jaray]

Yes!

[oko94]

Built before 1920 ?

[Paul Jaray]

Nope, but before 1930.

[Paul Jaray]

This picture can be found in a very known (and very very interesting) website about old motor cars

[4popoid]

Thanks to your excellent clue PJ, I was able to locate the photograph.  Unfortunately the information accompanying it is very sparse.  All it tells me is that this is a photograph taken in Portland, Oregon in the summer of 1929, of a reverse tricycle with moveable vertical stabilizer which was attached to the steering system.  It is referred to as the "freakmachine" weighing less than 200 pounds, and powered by a Harley-Davidson F head twin cylinder engine mounted amidships, providing enough power to reach a speed of 90 mph.  Apparently the builder's name is unknown, but he must have been very brave (or very foolish) if he was willing to drive this vehicle at 90 mph.

[Paul Jaray]

Yes, that was the website I was referring to...but as you can see the answer was not there...but now you have more clues.
Not enough for a lock or a point since this was the starting point I was waiting for you to reach
Now, who built it?

[4popoid]

Do you know the name of the builder, or must a name be provided along with proof that the person named was the builder of this vehicle?

[Paul Jaray]

I have another picture with an article about it and there is the identity of its builder.

[4popoid]

Do you know if the required builder's name is available from the internet, or only from printed media (book/magazine)?

[Paul Jaray]

Both

[pnegyesi]

Carlton Groat?

[Paul Jaray]

Not the builder of a dirt hopper or a canvas top  but you are few months away.
(I still don't think my clues are that easy, that's a good detective's work!)

EDIT: I believe Carlton Groat was a correspondant for that magazine for the Oregon area.

[oko94]

Was this vehicle featured in Popular Mechanics ?

[Paul Jaray]

Was this vehicle featured in Popular Mechanics ?

Yes

[pnegyesi]

1929 issue?

[Paul Jaray]

Yes!
Locked for pnegyesi & oko94.

[pnegyesi]

over to you oko94

[Paul Jaray]

Open for all!

[Oguerrerob]

Lightweight Racing Car by JS Eastham of Cottage Grove Oregon 1929 USA