I read a junior fiction trilogy in middle school in the early 70s.
It was about two brothers who build a flying machine (NOT the Wright brothers – as virtually all my searches return).
I think it was set in either England or New England, possibly on a farm; likely at the turn of the 20th century. I think their mother is one of the characters. I remember specifically a description of cool linen sheets – of all things!
I think both brothers may have liked the same woman. (They might have been cousins but I don’t think so…)
One of the brothers was injured at some point – either in a crash, or maybe in war? Walked with a limp and a cane after that.
I remember rich detail in the writing.
Any thoughts or ideas would be welcomed. I’ve been hunting for years!