Black Tern

90 cm tern, iterative tail and in-wash tuning.

Description

90 cm tern, iterative tail and in-wash tuning.

Development Log

  • 2021-06-18 — blacktern (chlidonias niger) maidenflight 18.06.21 — it showed that the tail is not effective enough to allow sustained flight, it needs either be enlarged, either have more dihedral and either use a smaller flap amplitude. wingspan: 90cm motor: 1811 brushless outrunner ESC: VGOOD 6A servos: 2x 2.5g K-Power P0025 receiver: Flysky 4Ch AFHDS2 gears: 56t0.5Mmaingear/7t0.5mPinionwire–52t0.5M/9t0.9mPinion battery: 180mah 2s lipo weight: 93g (without battery)
  • 2021-06-25 — black tern (Chlidonias niger) testflights 24.06.21 — fuselage was build and model painted. also tail got enlargement. by this, controllability and flap efficiency has improved but tail may also need more anhedral. the test flights were short because batteries were lacking. wingspan: 90cm motor: 1811 brushless outrunner ESC: VGOOD 6A servos: 2x 2.5g K-Power P0025 receiver: Flysky 4Ch AFHDS2 gears: 56t0.5Mmaingear/7t0.5mPinionwire–52t0.5M/9t0.9mPinion battery: 180mah 2s lipo weight: 120g (without battery)
  • 2021-07-19 — Black Tern TestFlight 17.07.21 — wingspan: 90cm motor: 1811 brushless outrunner ESC: VGOOD 6A servos: 2x 2.5g K-Power P0025 receiver: Flysky 4Ch AFHDS2 gears: 56t0.5Mmaingear/7t0.5mPinionwire–52t0.5M/9t0.9mPinion battery: 180mah 2s lipo weight: 120g (without battery)
  • 2022-05-21 — Black tern (Chlidonias niger) test flight 22.05.22 — improved the model by adjusting wings and use more downwards angle of flapping. by less wing stiffness the model bounces less, but it needs to be reduced further. wings were also modified for more airfoil and to fold downwards, hence by an inwards angle of articulation the mid part of wing folds more easy during upstroke wingspan: 90cm motor: 1811 brushless outrunner ESC: VGOOD 6A servos: 2x 2.5g K-Power P0025 stabilizer: byme-d receiver: FLYSKY pro micro ppm receiver gears: 56t0.5Mmaingear/7t0.5mPinionwire–52t0.5M/9t0.9mPinion battery: 180mah 2s lipo
  • 2022-05-24 — Black tern (chlidonias Niger) test flight 23.05.22 — Wings were made softer at outer wing tips by using some lighter spars. The flight has become more stable and efficient but by less dyhedral it shows that models turning capability is low, probably this can be fixed by more anhedral of inverted tail.. in the end a wing spar got loose by weak joint wingspan: 90cm motor: 1811 brushless outrunner ESC: VGOOD 6A servos: 2x 2.5g K-Power P0025 stabilizer: byme-d receiver: FLYSKY pro micro ppm receiver gears: 56t0.5Mmaingear/7t0.5mPinionwire–52t0.5M/9t0.9mPinion battery: 180mah 2s lipo
  • 2022-06-20 — Black tern test flights 19.06.22 — Wing was improved by adding more flex to inwards flow wingspan: 90cm battery: 300mah 2s lipo weight: 120g motor: 1811 brushless outrunner gears: 56t0.5Mmaingear/7t0.5mPinionwire–52t0.5M/9t0.9mPinion ESC: VGOOD 6A servos: 2x 2.5g K-Power P0025 stabilizer: byme-d receiver: FLYSKY pro micro ppm receiver
  • 2023-06-26 — Black tern TestFlight 25.06.23

Tagged as #ornithopter, #tern, #bird, #animatronic, #flying-machine.