Re: Transom is 16 1/2" :Long or short shaft?
Transoms are measured vertical, not following the slope. Following the slope adds a bit. Furthermore, the standards were set way back many moons ago when boats were made of wood, with keels. Back then, the motor had to run deeper. The motors were also made longer to get them deep enough in the water. Boats are now built with higher transoms, and 16" + is not unusual. Long story made short (pun), is you are fine for a short shaft motor.