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X-159V2

75 mordant  29 days ago

High wing loading supersonic “fighter”. FLCS testbed with spaghetti code.

In all honesty I don’t think anyone should look too far into the funky trees aspect of this airplane. It’s a bit messy, convoluted, and probably has a few variables that could be entirely removed.

I’ve been steadily working on this for a while (all the way up to V, lot of variants) and this was the first one I felt super comfortable posting. As opposed to previous versions, this one has flaperons, roll and yaw dampeners, and a few other items.

A few quirks/points with this aircraft:

  • With gear down, the canards aim for about 10 degrees AoA
  • The flap mode with gear down (LG/AF) is the same as alt flaps (Activate 2)
  • LG/AF Flaps have plus/minus 10 degrees of flaps based on pitch commands
  • Norm flaps are controlled via AoA
  • Tailstrike is around 11-12 degrees
  • PSt (Post Stall / Super-maneuverability, Activate 5) adds throw for elevons and canards as well as increases their response to AoA
  • Canards only command roll in PSt mode
  • S-FLCS (Simple FLCS, Activate 1) reverts to a very basic control system. Canards are disabled, flaps are disabled, no dampeners, slightly less control throw, and reduced AoA compensation. I don’t recommend this mode but I didn’t want to remove it either
  • You shouldn’t need a drag chute (Activate 4) for landing, the aircraft is fairly easy to aerobrake.
  • The refueling probe is incredibly far forward in the nose, I haven’t really worried about it as I don’t refuel often. My apologies
  • The engine has a faster response at higher power settings. In other words, it increases from 95-100% faster than it increases from 0-5%. This is (in my opinion) more realistic to real life aircraft.
  • Approach power is close to 10-12% Throttle

Instructions

Action Groups:

1 -> Backup(simple) flcs
2 -> Alt Flaps
3 -> Refuel Probe
4 -> Drag Chute
5 -> Supermaneuverability / Post Stall (Only reccommended under 400 kias)
8 -> Engine (8 is automatically on, turning off will stop the engine)

Vapp ~ 130-140 kias
Vr ~ 105 kias
Vflaps / Vgear (gear extended / alt flaps speed) ~ 250 kias

Max pitch on ground (ie: max pitch without tailstrike) ~ 11-12 degrees


I just think the plane is neat because of the FLCS, it’s nice to think I created something sorta complex (and that it works!). The aircraft isn’t too special, curious what the community thinks.

Cheers!

  • Mordant

Spotlights

General Characteristics

  • Created On iOS
  • Wingspan 23.0ft (7.0m)
  • Length 85.1ft (25.9m)
  • Height 13.7ft (4.2m)
  • Empty Weight 9,756lbs (4,425kg)
  • Loaded Weight 17,726lbs (8,040kg)

Performance

  • Power/Weight Ratio 1.521
  • Wing Loading 51.7lbs/ft2 (252.6kg/m2)
  • Wing Area 342.6ft2 (31.8m2)
  • Drag Points 2826

Parts

  • Number of Parts 66
  • Control Surfaces 4
  • Performance Cost 428