Aero → analysis on sizing

Come up with final design from sketches

Pusher vs Puller Prop Config

Pusher

Pros

• Less airframe drag, clear airflow over airframe
  • No propeller wash over fuselage

Cons

• Disturbed airflow at propeller due to airframe
• Less Engine cooling
• Less ease of accessibility for repair
  • Have to work in between booms for engine work
• Consider prop clearance
  • Tricycle landing gear lands on rear main landing first, will need to make sure propellor doesn’t hit ground
• Payload will be loaded in the front, making aircraft very nose heavy
  • Need longer fuselage to compensate
  • Potential stability issue when unloaded/loaded

Puller

Pros

• Best prop efficiency, clean airflow at propellor

Cons

• More airframe drag

Conclusion: Puller tractor preferred

Sketch Designs