Cdallas2,

many years ago DeHavilland Canada made available a free set of plans for the Twin Otter.

It's 86 2/3" (yes, you read right 2/3") wing span, running 2 OS 35 R/Cs.

As I recall, a chap working at DeHavilland did the design (R. Scott, drawn by Scale Flight Inc.). They may still be available direct.

Those were the days. You just sent a note to the manufacturer and they returned all the plans, drawings, photos and what not you could imagine - and then some. All free, too.

Just remember, it was only the short nose version that they certified on floats, although most people think the longer nose version would look better on floats.