RE: Prop choices for .020, .049 and .061
meowy,
A good place to start is the Cox 5x2 for the .020. I understand the APC 5.2x2 is alos overy good. For the Cox .049 it depends on the plane and engine set up. Anything from 5x3 to 7x3! The Norvels like to sing but again anything from 5x3 black Cox to 6x3. Being you have the .061 the 6x3 should work for you. also since you are talking "slow flight" maybe add a couple of head gaskets to the Norvel and go up in prop size alittle.
Later,
Tim