Reel its short shaft vs long shaft. Blu - long shaft aka 20" for sure. The extra 5" is needed when there its not dead calm. When the boat rocks, or if you shift weight around in the boat I'm betting a 15" shaft will allow the lower unit breach the surface of the water. You want that puppy to stay down no matter what.
Now if its always gonna be dead calm 1" chop the you would be fine with 15" short shaft.
Blue's .02 JMO
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1994 Wellcraft V21
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