I was most intrigued with the 3 cyclinder Curtiss, looked like a cut off aero engine from way back.
Did some internet searching and found this within https://curtissmotorcycles.com/history/
It was in 1909 that one of the most remarkable Curtiss motorcycles was introduced: the W-3 triple. Created by adding a third cylinder to a V-Twin, retaining the 50 degree angle between cylinders, the W-3 was unlike anything created before (or since). If a V-Twin is a pie-slice of a radial engine, the W-3 is 3/5ths of a radial. Rated at 10 horsepower, weighing 175 pounds, and claimed to be capable of 90 miles per hour, the $350 W-3 looked like a winner. Unfortunately, it was plagued with running issues and real-world performance wasn’t significantly better than the twin given the steep premium it commanded. It turned out that trying to feed three cylinders with two carburetors (one split between the two front cylinders, the second for the rear cylinder) wasn’t the best idea, and rather than refine the machine it was discontinued after only a year.