Apples - pick your power.
Oranges - pick your pitch.


A heavier airplane (with all other variables remaining the same) needs to EITHER increase the AOA or increase the speed to maintain level flight. Just because the plane is heavier, doesn't mean it will automatically "fly slower" as stated earlier. WE get to decide this with one of our primary flight controls - either change the pitch or change the power. And yes, sometimes both are needed. Full scale pilots learn this early on. Pitch and power, pitch and power, pitch and power!

To say that a heavier model flies slower than a lighter one because it has to fly at a higher AOA and thus has more induced drag is too simplistic and one dimensional, to say the least! Where to begin!

Kurt