Hi Dave
I am looking at using a YS1.10FZ in a 19% SU26 which i am currently building, prop choice will either 16x8 2 blade or 15x8 3 blade and i am looking at using Magnum 30% Heli fuel with 22% oil content. I am trying to figure out the tank size which i will need to acheive at least 10 minutes flight and a couple reserve, any ideas?
Cheers

16oz.

Both props you mention are too big. Try 15x10 two blade or 16x6 two blade. Try for peak ground rpm of 9000 to 9500 for best results.

OK, thanks for that Dave, is the Magnum 30% fuel ok for this kind of engine?

It will work fine.