Fully 3D Printed VTOL QuadPlane– Suggestions for Pusher Motor Selection

Hello everyone,

I’m working on a fully 3D-printed Twin Boom VTOL QuadPlane for a college project and need some advice on selecting the right pusher motor and prop combination for maximum endurance. Here are the specs of my current design:

  • Wingspan: 2000 mm
  • Wing Area: 52 dm²
  • Stall Speed: 52 km/h
  • Drag Coefficient: 0.06
  • Lift Coefficient (Cl): 1.04
  • Battery: 6S 22,000 mAh
  • Weight: 6500g / MTOW: 7000g

I’m considering T-Motor options and looking for something efficient at low throttle that can keep the plane in steady cruise with minimal power draw. I haven’t finalized a prop size yet, so I’m open to recommendations on motor/prop combinations that balance endurance and thrust efficiency.

  1. What T-Motor pusher motor and prop combination would you recommend to consider for this setup to maximize endurance?
  2. Ideally, the pitch speed should be at least twice the stall speed (~104 km/h), but I’m having trouble meeting this while keeping the VTOL max takeoff weight reasonable. Would it be okay to go with a lower pitch speed?

I think for that size and weight a good starting point would be a 15*10 propeller with a 400-600kv motor.

Should get you about two hours of cruise at roughly 20 m/s.

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Actually looks like 16*8 pairs better with this 500kv motor.

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