Info on the de Havilland Canada DHC-3 Otter:
http://www.bush-planes.com/DeHavilland-DHC-3-Otter.html
They are serious workhorse airplanes, reliable to a fault. Some have had their old radial piston engines replaced with modern, more efficient turboprops.
}:-)4
I’ve flown on both the Otter and and it’s smaller cousin the beaver and they all still had the old radial engines. A good pilot could get either of those things in the air off a lake the size of a large mud puddle and they told me they preferred them over the newer turbo props even now.
I always felt safe flying in those, even if they were built back in the 50’s. The scariest ride I ever flew was in a Cessna off a smaller lake, it took about a mile to get the floats to break free from the water, way underpowered for the job IMHO.