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SAAB J-35D Draken

13.6k brians1209  10 months ago

SAAB J-35D Draken

This build is from 2021 that I forgot to finish.
It's finally out, but the reason it took 2.5 years to finish it doesn't mean I was constantly improving it, I just forgot.

Disclaimer: The Draken by nature is unstable, I do not recommend controlling this aircraft with a keyboard.

(The Draken in reality is even more unstable, mine is a bit too stable especially in terms of how it is pretty much immune to flat spins )

Different Versions (Bicolour Scheme / Low part versions)

Bicolour skin build 1352 parts

Bicolour skin build 1097 parts

Chrome skin build 1297 parts

Chrome skin build 952 parts

WiP

I kinda gave up on this thing

There's a lot stuff that are missing

Flight Model

Please note that the Draken pulls a lot of AoA, and is very sensitive, especially at low speeds (around 600km/h and lower)

High speed maneuvers are at around 11~12Gs (The aircraft may exceed 12Gs for a split second in a high speed turn)

Do not exceed IAS 1420km/h as the control surfaces will lock up.
(Should've added wing rips but...lazy)

Cobra

As there are no such thing as a AoA limiter in this aircraft, to perform a cobra in this aircraft, decrease the throttle down to 30%~50% or lower, and simply adjust your IAS to around 350~400km/h, and pull as hard as you can.

Increase thrust after the maneuver as soon as possible Do not maintain the pitch for too long, as it will lead to unrecoverable stalls, sometimes a flat spin.

Flatspin recovery:
Apply maximum thrust
Apply Roll, Yaw to the direction of spin, Pitch down.
(Do not try to counter roll/yaw)

Engine

Replication of the Volvo RM6C in terms of thrust, fuel consumption etc

No fancy start up procedures, but IAS and altitude will affect thrust, fuel consumption

Thrust will gradually increase until it hits around IAS 1200km/h at deck.

Thrust, Fuel consumption will decrease by around 3% every 1000 meters, until around 15000+meters, it will not ignite.

Controls

AG1 - Low sensitivity controls
AG2 -
AG3-
AG4- Jettison RB-24Js
AG5- Ram Air Turbine (Does nothing but popping a mini fan behind the front gear)
AG6- AirBrakes
AG7- Drogue Chute
AG8- Open / Close Canopy

Ejection Seat

Activated by Eject in weapons tab

Cockpit sucks lol most stuff aren't functional (Radar, AoA indicator, Landing Gear warning light etc)

Versions

Bicolour skin build

Bicolour skin build 1352 parts

Bicolour skin build 1097 parts

Chrome skin build 1297 parts

Chrome skin build 952 parts

HEJ DÅ !

Spotlights

General Characteristics

  • Successors 2 airplane(s) +14 bonus
  • Created On Windows
  • Wingspan 30.4ft (9.3m)
  • Length 50.3ft (15.3m)
  • Height 14.7ft (4.5m)
  • Empty Weight 19,054lbs (8,642kg)
  • Loaded Weight 22,599lbs (10,250kg)

Performance

  • Power/Weight Ratio 477322.944
  • Wing Loading 53.5lbs/ft2 (261.4kg/m2)
  • Wing Area 422.1ft2 (39.2m2)
  • Drag Points 240

Parts

  • Number of Parts 1582
  • Control Surfaces 1
  • Performance Cost 5,524
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  • Profile image
    13.6k brians1209

    @Zal777

    About the instabilities:
    .
    Let me explain again. Similar complaints have been received before. Also, the SAAB J-35 Draken does not have flaps, just as most other double delta/delta wing aircrafts.
    .
    The J-35D Draken is unstable by its very nature.
    .
    The CoM of the Draken is shifted to the rear of the aircraft (not to exclude most of the body being a massive LERX), making it unstable, and prone to unrecoverable flat spins (Some Drakens were equipped with chutes to deploy at air when caught in a flat spin)
    The cobra maneuver of the Draken wasn't on purpose, it was rather considered as a flaw. But with these intentional instabilities and 'flaws' the Draken came with excellent maneuverability.
    .
    The Draken in reality is even more unstable, much easier to stall and fall into a flatspin. Most modern fighters are intentionally built to be unstable (relaxed instability), but controlled by a flight computer to be stable in flight. The Draken does not have such technology. (At least the Draken's CoL is behind the CoM, the F-16 for example has the CoM behind the CoL).
    .
    To put it another way, Draken pilots had to 'trim' the aircraft to do the same maneuvers in which other aircraft required the whole flight stick to be involved.
    .
    TL;DR I would go as far to say that my Draken isn't unstable enough, and I wouldn't try controlling this with a keyboard.
    .
    Even aircrafts that are more stable than the Draken in real life does not control like you would imagine in real life.
    .
    It took some effort to make it purposefully unstable whilst flyable in SP.
    I hope you understood.

    Pinned 10 months ago
  • Profile image
    1,904 florky

    i love this d r a k e n

    5 months ago
  • Profile image

    @brians1209 Yes, if you want i can help you at any moment for building one

    9 months ago
  • Profile image
    13.6k brians1209

    @Angelo135YouTube
    Yeah, especially the cockpit. It's basically a WiP build.

    9 months ago
  • Profile image

    Very cool plane but it's missing some parts...

    9 months ago
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    13.6k brians1209

    @MTakach
    It is crucial that you remove all collision responses in xml when building a landing gear (remove collision on both the landing gear parts and the landing gear bay), and parts like shock/rotator/pistons are recommended to have multiplied mass for strength.
    If the problem persists, tweak the traction of the wheel by xml (foward/sideway traction etc), and this takes some trial and error.

    10 months ago
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    7,875 MTakach

    Hello, I am building custom landing gear, but I am having issues with the struts clipping through eachother whilst on the ground, what have you done on the draken in order to prevent this?

    10 months ago
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    13.6k brians1209

    @Zal777
    Limiting the Gs of an aircraft is quite common in SimplePlanes, in order to achieve realistic performance.
    .
    You are a relatively new player, so I understand, but many people put great effort to limit the Gs of their aircraft with funky tree codes or other many methods.
    .
    But of course, it is a preference whether you want a realistic performance or not.
    .
    Some may enjoy having realistic flight models, some may prefer to not. Totally understandable, have a great day.

    10 months ago
  • Profile image
    629 Zal777

    @brians1209 Really, if you take this "G's force" thing, the game becomes more boring than it already is.

    I liked you,... because you're diplomatic. you will give your person a positive vote.

    10 months ago
  • Profile image
    629 Zal777

    @brians1209 I understand, thank you for your humility.

    10 months ago
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    13.6k brians1209

    @Zal777
    Your plane that you sent me exceeds 20Gs of pull in a barrel roll.
    I don't think that is realistic.
    .
    Also, it seems that you are here to judge my build and advertise your own stuff. Please don't.

    10 months ago
  • Profile image
    13.6k brians1209

    @Zal777
    .
    Arcade styled flight simulators represent flight characteristics in a comfortable and simple way. I would say this is more of the 'correct' representation.
    .
    But sure, you might not like it.
    .
    But I hope you understood that this is a fully intentional feature that I put in with quite some effort.

    10 months ago
  • Profile image
    629 Zal777

    @brians1209 My main focus on my aircraft, is firstly!! Maneuverability and Stability, so much so that I focus primarily on these characteristics, which is why their shape and design is for performance more than aesthetics.

    10 months ago
  • Profile image
    629 Zal777

    @brians1209 In short, it's a terrible aircraft. It's just pretty, but horrible to ride, I get it.

    10 months ago
  • Profile image
    13.6k brians1209

    @Zal777
    It seems you have a misunderstanding of the unstable nature of the Draken.
    .
    Please read the pinned comment, and also, it does have trim.

    10 months ago
  • Profile image
    629 Zal777

    Your plane is bad, it's unstable, it doesn't fly well... it doesn't have "TRIM" it doesn't even have flaps...

    10 months ago
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    Good job 👍

    +1 10 months ago
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    13.6k brians1209

    @BagelPlane

    The fuel consumption is based on the Volvo RM6C / RollsRoyce Avon 300 series, which burns about ~30Ls of fuel per minute.
    It will decrease by ~3% together with the amount of thrust every 1000 meters.

    And yes I was lazy about the landing gears lol (I didn't even add anything in the landing gear bay too, not to mention missing details in the cockpit), and as I mentioned, please consider it a WiP build.

    As a double delta wing aircraft, landing should be done at very low speeds, and the overall landing experience is bollocks as it was in real life, actually, a bit more shittier since I was also lazy with balancing the landing gear shocks. Best solution would be to release the drogue shoot as soon as possible. Sorry about that, too much laziness.

    Thanks for the detailed review!

    10 months ago
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    24.1k BagelPlane

    Just spend a good while flying this thing and it is a blast!
    >
    Took off from Wright Airport and headed towards Maywar. I was a tad bit shaky at first, but once above 15,000 feet the Draken handled amazingly. Great flight model, I don't know if this was an intended feature, but I like how the camera shakes a bit in the cockpit, especially when then parts are moving on the aircraft. I feel it captures that early jet age feeling. Coming in for a landing at Yeager wasn't too difficult, but I think I came in too fast, leading to the jet bouncing up a few times before finally settling into a roll down the runway. The landing gear is nice!
    >
    Currently my only gripes are fuel consumption and the rear landing gear lights. For fuel, I may have just been running the jet at too high a power setting. With the landing gear lights, they look like they're just floating in front of the gear.
    >
    In terms of aesthetics this plane is beautiful. The mixing of silver on the fuselage to look like different panels, roundels, and numbers all look so clean and crisp. The cockpit is amazing, and I really like how the canopy can be opened and features an ejection seat.
    >
    TL:DR Great plane, deserves every upvote. Go fly!

    +1 10 months ago
  • Profile image

    Excellent work

    +1 10 months ago
  • Profile image
    13.6k brians1209

    @Baoligao

    It is supposed to be that way, the CoM of the Draken is shifted to the rear of the aircraft (not to exclude most of the body being a massive LERX), making it unstable, and prone to unrecoverable flat spins (Some Drakens were equipped with chutes to deploy at air when caught in a flat spin)
    The cobra maneuver of the Draken wasn't on purpose, it was rather considered as a flaw. But with these intentional instabilities and 'flaws' the Draken came with excellent maneuverability.
    .
    The Draken in reality is even more unstable, much easier to stall and fall into a flatspin. Most modern fighters are intentionally built to be unstable (relaxed instability), but controlled by a flight computer to be stable in flight. The Draken does not have such technology. (At least the Draken's CoL is behind the CoM, the F-16 for example has the CoM behind the CoL).
    .
    To put it another way, Draken pilots had to 'trim' the aircraft to do the same maneuvers in which other aircraft required the whole flight stick to be involved.
    .
    TL;DR I would go as far to say that my Draken isn't unstable enough, and I wouldn't try controlling this with a keyboard.

    10 months ago
  • Profile image
    4,371 Baoligao

    The appearance is excellent, but the handling is really terrible

    10 months ago
  • Profile image

    @brians1209 yes I love cobraing when I’m bored

    +1 10 months ago
  • Profile image
    13.6k brians1209

    @SourDoughBread
    Thanks, I've actually thought of abandoning this build many times. Glad I finished it to hear you enjoy it.

    10 months ago
  • Profile image
    1,904 florky

    THE DORITO PLANE BACK AT IT AGAIN DOMINATING THE SITE!!!

    +1 10 months ago
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