Profile image

Grumman X-29

5,653 GRANDAYE  6 days ago
Auto Credit Based on MAHADI's COLD WAR Challenge

Description (According to Wikipedia)

The Grumman X-29 was an American experimental aircraft that tested a forward-swept wing, canard control surfaces, and other novel aircraft technologies. The X-29 was developed by Grumman, and the two built were flown by NASA and the United States Air Force. The aerodynamic instability of the X-29's airframe required the use of computerized fly-by-wire control. Composite materials were used to control the aeroelastic divergent twisting experienced by forward-swept wings, and to reduce weight. The aircraft first flew in 1984, and two X-29s were flight tested through 1991.

The X-29 design made use of the forward fuselage and nose landing gear from two existing F-5A Freedom Fighter airframes (63-8372 became 82-0003 and 65-10573 became 82-0049).[1] The control surface actuators and main landing gear were from the F-16. The technological advancement that made the X-29 a plausible design was the use of carbon-fiber composites. The wings of the X-29, made partially of graphite epoxy, were swept forward at more than 33 degrees; forward-swept wings were first trialed 40 years earlier on the experimental Junkers Ju 287 and OKB-1 EF 131. The Grumman internal designation for the X-29 was "Grumman Model 712" or "G-712".

Controls

Now I wanted some few realistic things on the aircraft like fly-by-wire, so I intentionally put the CoM behind the CoL, basically making this aircraft pitch unstable. And using a FT equation I found online, the aircraft is flyable though still plagued with instabilities

Before you Take Off

Please, please, please, set Trim halfway down, the aircraft will be pitching down with neutral trim
Also don't try to pitch the plane too hard, there is a high risk that it spirals out of control, if it happens, use the chutes

AG1 : Activates the Afterburners
AG2 : The aircraft is equipped with Anti-spin chutes, activate this when the aircraft goes out of control

Credits
- GuyFolk's FBW equation on HomeMade1's EF-18D Viper
- Keml's Jet engine
- Thealban's USAF logo

Gallery

Happy Unstable Flying hAHa

Spotlights

General Characteristics

  • Predecessor COLD WAR Challenge
  • Created On Android
  • Wingspan 22.1ft (6.7m)
  • Length 47.7ft (14.6m)
  • Height 11.9ft (3.6m)
  • Empty Weight 17,149lbs (7,778kg)
  • Loaded Weight 18,878lbs (8,562kg)

Performance

  • Power/Weight Ratio 4.642
  • Wing Loading 34.9lbs/ft2 (170.2kg/m2)
  • Wing Area 541.6ft2 (50.3m2)
  • Drag Points 4322

Parts

  • Number of Parts 607
  • Control Surfaces 4
  • Log in to leave a comment
  • Profile image
    5,653 GRANDAYE

    @Spaceflower 😂😂😂

    2 days ago
  • Profile image
    1,720 Spaceflower

    h a p p y u n s t a b l e f l i g h t

    +2 2 days ago
  • Profile image
    5,653 GRANDAYE

    Thanks @HorizonWZL

    2 days ago
  • Profile image
    4,238 HorizonWZL

    So expert indeed!

    2 days ago
  • Profile image
    10.8k GuyFolk

    @GRANDAYE
    Thanks lol.
    I'm happy to help.

    +1 5 days ago
  • Profile image
    5,653 GRANDAYE

    OMG I give my biggest thanks to you sir @GuyFolk , here have these please 👑

    5 days ago
  • Profile image
    10.8k GuyFolk

    @GRANDAYE
    Quick fix:
    Increase aggressiveness of the canards by increase range of motion to 60 and speed to 60%, it works for me but fine tuning is still needed.
    The nose down tendency is due to misalignment of the cockpit and main wings, this cause the FT to take the "misaligned" angle of attack into calculation.
    The real one does have that misalignment only in the wing root to counteract the wingtips that will bend backward inflight.
    To fix this problem I recommend you to make the cockpit block "look down" a bit to align with the main wing angle.
    Sorry for the long lecture lol, here's some potato.
    🥔🥔🥔

    +2 5 days ago
  • Profile image

    @DJ2keroni well irl it was pretty unstable to fly

    5 days ago
  • Profile image
    5,653 GRANDAYE

    internally cries with deep regret

    5 days ago
  • Profile image
    120k MAHADI

    @GRANDAYE lol. that's actually a poor one if you ask me.

    5 days ago
  • Profile image
    5,653 GRANDAYE

    Awww, an eye for an eye, a paint for a landing gear, I think I'm cool with the trade off @MAHADI

    5 days ago
  • Profile image
    120k MAHADI

    your paint is very cool but those LGs will cost you some negative points.

    5 days ago
  • Profile image
    120k MAHADI

    finally!

    5 days ago
  • Profile image
    5,653 GRANDAYE

    Uhmmm hahahha okay, I definitely skipped that one @DieDieTheLoaf

    5 days ago
  • Profile image

    I like.

    +1 5 days ago
  • Profile image

    Awesome build, but why make LG doors, and not the black well?

    +2 5 days ago
  • Profile image
    1,304 TOMJeb117

    Yes that why it had fly by wire

    +1 5 days ago
  • Profile image
    435 tucan

    i mean the real one was super unstable.

    +3 6 days ago
  • Profile image
    3,044 DJ2keroni

    I‘m sorry for saying this but it flies like sh🅱️t, but it Loks pretty neat

    +1 6 days ago