Originally Posted by Spots and Dots
If a Kort Nozzle will give you about 30% more thrust, why isn't everyone running them? That sounds like a great thing.
What's the downside?
On a Planing hull, the added drag offsets the the thrust gainesd so no real benefit and few if any run them. On a displacement hull where there are no high speeds to creat the high drag, and where thrust needs to be maximized, you'll be hard pressed to find a tug or towboat without one. On an outboard powered planing hull, the benefit would likely be better directional control, and maybe a bit more thrust. But, I think you will also loose a couple of MPH on top from drag on a planing hull and worse performance in reverse,