yeah I know, thanks for the info, I like the rule of thumb. But like everyone else I've got to ignore all the good advice I get and be greedy I might try for just the single tank up front yet, it depends on how well the test runs go. I've got quite a bit of work to do on the Senior, and some work to do at work so I've got a while to decide what I'm going to do. With the gouge you gave, a couple 12 oz tanks would be 40 minutes of flying.

This airplane is sort of a continual project. It was probably a little outside my build skill so its kinda beastly and getting more beastly, but its a lot of fun to fly.

Thanks again