E-flite EFL02050 Blackbird Twin Instruction Manual

June 1, 2024
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SR-71 Blackbird 40mm Twin EDF
Manual Addendum

Read Before Setup and Flying

Smart Technology Telemetry

(In reference to page 9 of the manual)
Set low voltage alarm to 3.45v/cell minimum.
Nose Skid
A nose skid is included which can be installed in place of the nose gear to help protect the aircraft during belly landings on hard surfaces.

Trim

  1. The elevator and elevon neutral points shown on page 7 of the instruction manual are for flying WITHOUT the landing gear installed.
    Flight performance is noticably better without the landing gear installed (due to less weight and drag).

  2. Always trim for neutral in AS3X mode without applying power to the motors, so AS3X is not active.

  3. Neutral and flight trim will change when flying with the landing gear installed.
    Trim without landing gear: The elevator halves should be aligned with the edge of the fuselage.
    Use a straight edge to align the elevons with the elevators.
    Trim with landing gear: Lengthen the control linkages to raise the elevator halves and elevon neutral point 0.5mm, measured from the trailing edge of the elevator to the edge of the fuselage.
    Use a straight edge to align the elevons with the elevators.

  4. Ensure both sides of the aircraft are at the same trim position before flight.

E-flite EFL02050 Blackbird Twin - Fig 1

Trim Without Landing Gear

E-flite EFL02050 Blackbird Twin - Fig 2

Trim With Landing Gear

E-flite EFL02050 Blackbird Twin - Fig 3

©2023 Horizon Hobby, LLC. E-flite and, AS3X, are registered trademarks of Horizon Hobby, LLC.
EFL02050

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