From Esther’s slides https://docs.google.com/presentation/d/1C1Vp5LCQR6KghQLGRMtFNW8NMnJ3azGcoZFELV4_-O4/edit?usp=sharing:

• place center of aileron at max rolling moment (Wait but doesn’t the max rolling moment depend on the placement of the aileron? Do we just move the aileron around until the locations converge?)
• follow raymer chart for proportions

From Airplane Design Part 2:

• we just got historical data

This PDF https://www.conachenuavs.com/downloads/ProAdvice 3 - AILERON SIZING.pdf has a bit more analytical stuff:

https://www.kitplanes.com/design-process-roll-control/

target roll rate: 30 degree bank one way to 30 degree bank other way in 4 secs at landing; 15 degrees/sec

https://aero.us.es/adesign/Slides/Extra/Stability/Design_Control_Surface/Chapter 12. Desig of Control Surfaces (Aileron).pdf

use this