Longest is 87" and it'll fit my 23'er I dont think he'll want a shaft that long on a 16?
Yea, always better to have enough so it doesn’t pop out of the water, but too much simply makes things more difficult. Especially deploy and stow. The guy has a 16’ boat. Only needs a 60” shaft. My Lund 1650 had a 60” shaft and I fished in 3-4’s a few times and don’t ever remember the prop popping out of the water.
I had a 72” shaft on my 21’ Trophy and it rarely popped out. A buddy of mine had an 18.5’ aluminum with a 60” shaft and if we fished in anything more than 2’s it would occasionally pop out. A 72 would have been better on this boat.