"Flyer I 1903" had a propeller placed underneath that revolved horizontally!!, according to an article signed Wilbur Wright and published in Feb. 1904
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One of the propellers was set to revolve vertically and intended to give a forward motion, while the other underneath the machine and revolving horizontally, was to assist in sustaining it in the air. … After the motor device was completed, two flights were made by my brother and two by myself on December 17th last."
Source, "The Experiments of a Flying Man", author Wilbur Wright, The Independent, Feb. 04, 1904, pag. 246, internet address
The Experiments of a Flying Man [Wilbur Wright, Independent, February 1904] | Library of Congress
Definitely, the flying machine W. Wright talked about in the article is not the one with two pusher propellers, well known from pictures published for the first time in September 1908 in "The Wright Brothers' Aeroplane" that appeared in The Century Magazine (see
The Wright Brothers' Aeroplane [Orville and Wilbur Wright, The Century Magazine, September 1908] | Library of Congress , page 644 ).
In conclusion, two different articles, written by the same Wright brothers and published more than four years and half apart, talk about two distinct airplanes (two different Flyer I) as flying on Dec. 17, 1903. The brothers definitely lied in one of the two texts. There is no way they could have told the truth in both articles.
"Flyer I" with a propeller beneath appeared in numerous publications as late as May 1906 (see:
Scrapbooks: January 1902-December 1908 | Library of Congress ).