[DKjens]

I would say that it all depends on how well run in and adjusted your DA50-R is, for how long you like to fly, how much of a fuel buffer you like at the end of a flight, your flying style, your smoke set up, etc. etc.

The DA50-R can consume anywhere from 8 - 24 oz of fuel in a 10 min flight period, depending on settings and flying style. It's my experience that people use a smoke tank about 70-100% the size of the fuel tank. On my 40% planes, I try to fit a 50 oz fuel and a 50 oz smoke tank if possible. In my MX2 i have a 50 oz fuel and two 24 oz smoke tanks.