I’m trying to track down a series I read as a kid (in the eighties). It’s main character was a boy genius, who made occasional inventions (like a contraption to launch newspapers from his bicycle to speed up his delivery route) or ideas for inventions (like extending the “chimney” on a train locomotive horizontally down the length of the train, so that cinders would not hit passengers leaning out a window. [idea shot down by engineer in book, as I recall]). I believe he may have used his intellect to solve minor mysteries within the books.
The books were sparcely illustrated, like the Judy Bloom novels: Fudge and Super Fudge, and the illustrations were similiar in quality and style. I believe the illustrations may have shown him as being freckled, as well.
I have no recollection as to the author’s name, character’s name, or any of the titles. Any ideas on what series it could have been?