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Northrop F-20N Tigershark

26.8k ChiChiWerx  6 months ago

VFC-12 "FIGHTING OMARS" BRIEFING ROOM, 0630L. "Attention! At ease. Good morning, gentlemen! My name is LT CDR Buford "Viper" Bentley and welcome to the Fighter Weapons School, or as we like to call it here...TOP GUN. This morning, you'll be flying your first advanced air combat maneuvering hop against our adversary simulator, the F-20N "Tigershark". The F-20 is an outstanding adversary simulator, fast, small, hard to see and it turns like nothing else. Get in a turning fight with an F-20...or a MiG-21 or a MiG-29 and it's over! Your F-14s, while outstanding interceptors, do not match an F-20's, or the Soviets', turn radius, so attempt to engage using your advantages: SA, speed and BVR missile shots. Questions? Step in 15, dismissed!"

Gun Kill


Imagine if, in the 1980s, the USN and USAF had bought the Northrop F-20 "Tigershark" as their premier adversary fighter, a jet that brought true 4th Gen capabilities into the role? Well, imagine no more. The F-20 was arguably one of the finest fighters never fielded. Northrop upgraded it's F-5E Tiger with a single General Electric F404-GE-100 engine, giving it slightly better than a 1:1 thrust to weight ratio, Mach 2 speed at altitude, SUPERCRUISE, advanced radar and systems, plus a new cockpit with a bigger, easier to see out of canopy. But the F-20, offered for sale to the U.S., Taiwan, South Korea, Oman and many others, and marketed by none other than Brig Gen Charles "Chuck" Yeager, was put aside in favor of the F-16 as those countries wanted to fly what the USAF was flying. A great jet became a footnote in history. But here it is now, just like the RL jet, along with its accurately scheduled afterburner nozzle, AUTO trailing/leading edge flap scheduling, Flight Path Vector (FPV), working G-meter, sequenced landing gear doors, AIM-9Ls, and more....all in a 1:1 scale with accurate weights, fuel, wing loading, performance, turn capability, done up in the livery of VFC-12, the "Fighting Omars", one of the USN's TOP GUN units from the 1980s. I've compromised very little here to bring this one to life. It's my finest work to date, I hope you all enjoy!

WARNING: I WAS AN INSTRUCTOR PILOT IN THE T-38 AND I BROUGHT
ALL MY EXPERIENCE TO ENSURE THIS F-5 DERIVITIVE FLIES LIKE THE REAL THING, AT LEAST AS CLOSE AS SP DYNAMICS ALLOWS. IT WILL DEPART CONTROLLED FLIGHT IF YOU MANHANDLE IT, IT WILL STALL ON FINAL IF YOU GET TOO SLOW, IT WILL THROW ITS DROPTANK OFF IF YOU SEVERELY OVER-G THE JET, BUT ITS A BLAST TO FLY, JUST LIKE THE REAL THING.
READ AND HEED THE FLIGHT MANUAL!

Credits:

BogdanX - This would have been impossible to complete without his help, he completely revamped my flight model and gave all sorts advice and criticism.
SnoWFLakE0s - Funky Tree genius...take a look at the formulas on this one, insanely long statements which accurately capture the F-20's coolest features.
FairFireFight - He built the gorgeous AIM-9Ls, which like the real things, do occassionally miss.
Leehopard - FPV concept brought to life.
EngineerOtaku - Thanks for the MiG!

To all my buds on the SPMC for your advice, criticism and encouragement, thanks!


NAVAIR F-20N FLIGHT MANUAL

SECTION 1. Description.

SP CONTROLS:

Fig. 1
Fig. 1, F-20 Callouts.

AG1 - Position and Landing Lights (landing lights extend with LG)
AG2 - Nose Gear Hike (Activate prior to takeoff to reduce takeoff distance)
AG3 - Droptank Jettison (If not equipped with droptank, activate for increased speedbrake extension)
AG4 - MASTER ARM (Arms AIM-9Ls)
AG5 - Drag Chute
AG6 - Tailhook
AG7 - [Reserved]
AG8 - [Reserved]

Landing Gear - Landing gear and flaps (w/flaps in AUTO).
VTOL - Roll trim (see Section 3-1, Tactics, Techniques and Procedures, below).
Trim - Pitch trim.
Brake - Speedbrakes/wheel brakes.
Throttle >98% RPM - Afterburner.

Fig. 2
Fig. 2, HUD Symbology.

NOTE: TRIM IS YOUR FRIEND AND COMPENSATES FOR CHANGES IN AIRCRAFT SPEED, JUST AS IT DOES IRL...YOU SHOULD BE USING TRIM AS MUCH AS YOU USE STICK INPUT TO ADJUST AIRCRAFT PITCH.

WARNING: THIS IS A SYMMETRIC WING AND FLIES AS IT DOES IRL. FASTEST ROLL RATES ARE ACHIEVED BY UNLOADING BACKSTICK PRESSURE, INPUTTING AILERON ROLL, THEN RELOADING BACKSTICK PRESSURE ONCE AILERONS NEUTRALIZED. USING THE AILERON TO ROLL WHILE HOLDING HIGH AOA/BACKSTICK PRESSURE IS MARGINALLY EFFECTIVE AND MAY RESULT IN AIRCRAFT DEPARTING CONTROLLED FLIGHT. UTILIZING THE RUDDER DURING HIGH AOA FLIGHT IS ALSO AN APPROVED TECHNIQUE FOR ROLLING THE AIRCRAFT
(Sorry, keyboard users, but this is as it is IRL and I wasn't going to decrease the turn rate to accommodate as long as a proper pilot technique could compensate).


SECTION 2. Normal Procedures.

TAKEOFF CHECKLIST:

  1. Set aircraft lighting, as appropriate (AG1).
  2. Hike nose gear (AG2).
  3. Verify (with crewchief) speedbrake store compensation selected (If no droptank or stores on centerline, activate AG3).
  4. Set takeoff trim (front edge of horizontal slab even with index).
  5. Takeoff Power, 98% (MIL Power) or 100% (MAX Power), as appropriate.
  6. Rotate at 145 KIAS to liftoff at 162 KIAS.
  7. Raise gear immediately after airborne, verify flaps follow.
  8. Trim as required.
  9. Dehike nosegear (deactivate AG2).

NOTE: Nosewheel steering limit 65 KIAS. Use small, short rudder inputs during takeoff roll to prevent a pilot induced oscillation and runway excursion.

FENCE IN CHECK (PRE COMBAT CHECKLIST):

  1. Turn off aircraft lighting (AG1).
  2. Select AIR-TO-AIR or AIR-TO-GROUND mode (as appropriate).
  3. Select MASTER ARM to arm weapons (AG4), if equipped.
  4. Verify flaps in AUTO.

NOTE: Best Rate of Turn is a achieved above 450 KIAS, MAX power.

NOTE: Aircraft controls will become less effective when exceeding Mach .98 (approximately 520 KIAS at 10,000' MSL) and entering the transonic zone. For best turn rate in engagements, keep aircraft speed between 450 - 520 KIAS.

NOTE: Monitor leading edge and trailing edge flaps For extension and retraction during maneuvering.

LOAD FACTOR LIMITATIONS
SYMMETRICAL FLIGHT
Load Factor (Gs)
- 3.0 to +9.5
WITH CENTERLINE 150 GAL TANK INSTALLED
Load Factor (Gs)
-3.0 to +6.0

NOTE: When carriage of single AIM-9 is required on a wingtip station, use roll trim, as required, to compensate for aircraft roll.

FENCE OUT CHECK:

  1. Turn On Aircraft Lighting, As Appropriate (AG1).
  2. Deselect MASTER ARM/safe weapons (AG4).
  3. Deselect AIR-TO-AIR or AIR-TO-GROUND Mode.

LANDING CHECKLIST:

  1. Check nosegear dehiked (Deactivate AG2).
  2. Enter final approach approximately 5 NM at 260 KIAS or Less.
  3. Below 260 KIAS, lower landing gear (verify flaps extend FULL).
  4. TRIM AS APPROPRIATE...put Flight Path Vector on or near the NEAR end of the runway.
  5. Minimum of 155 KIAS on Final (Approximately 25% Power).
  6. Over underrun, power to idle and flare to land...put FPV at FAR end of runway in flare.
  7. Drag chute (AG5), if required.
  8. Apply brakes to stop.

Fig. 3
Fig. 3, Pattern Diagram.

Happy Hunting and Fly Safe!

Happy Hunting

Spotlights

General Characteristics

  • Successors 5 airplane(s) +14 bonus
  • This plane has been featured
  • Created On Windows
  • Wingspan 28.4ft (8.6m)
  • Length 47.5ft (14.5m)
  • Height 15.3ft (4.7m)
  • Empty Weight 13,935lbs (6,320kg)
  • Loaded Weight 19,389lbs (8,795kg)

Performance

  • Power/Weight Ratio 1.274
  • Wing Loading 62.7lbs/ft2 (305.9kg/m2)
  • Wing Area 309.5ft2 (28.8m2)
  • Drag Points 2060

Parts

  • Number of Parts 729
  • Control Surfaces 3
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  • Profile image
    62.9k Hedero

    Oh wow. I didn't realize the f-20 was that manueverable. Not sure if the same can be said for the t-38 (which is what I'm making) or not. But so you flew f-5s? What did you serve in the army?@ChiChiWerx

    5 days ago
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    26.8k ChiChiWerx

    @Hedero that’s actually not that surprising, the F-5 and MiG-21 were very similar performers, which is why the U.S. uses the F-5 as an adversary simulator to this day. The F-20 was a better performer, thanks to the much better engine with more thrust, but it wasn’t light years ahead of the MiG in terms of sheer performance numbers. But the weapons systems, cockpit displays and pilot integration was better than the MiG. That aspect is much more difficult to capture in SP, but it does make sense you were able to tweak the flying performance. It’s also gratifying in that I was able to at least land in the same performance ballpark as the RL jet.

    5 days ago
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    62.9k Hedero

    Lol I was messing around with your plane and made it fly like a mig-21

    5 days ago
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    675 Nash11

    Replace fighting omars to Fighting OmarTSVs

    9 days ago
  • Profile image

    waw

    3 months ago
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    2,794 RaendyLeBeau

    awesome work! very scale, thnks

    4 months ago
  • Profile image

    Your builds and understanding of aircraft, physics and realism are insane, im definitely going to try to learn some methods you use in SP thanks for sharing them

    4 months ago
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    26.8k ChiChiWerx

    Alas, @TOXICJohnny, like the F-5N from which it’s derived and with which it shares its mission of adversary training, it’s not a shipboard fighter. I didn’t include a catapult attachment, though I am sure you could add one quite easily.

    5 months ago
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    anybody Having issues with the catapult?

    5 months ago
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    2,528 switdog08

    ('<>')

    5 months ago
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    @ChiChiWerx that makes sense, thanks!

    5 months ago
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    26.8k ChiChiWerx

    @OrangeConnor well, the really long and detailed description is partially intentional. The abbreviated flight manual, called the “Dash-1” for the RL F-20A (available for sale online) is around 340 pages. Which, believe it or not, is fairly short as far as flight manuals go. Pilots are expected to know a great deal about the aircraft they fly and recall the information almost reflexively. I remember my first USAF flying course, flight screening in the mighty T-41 Mescalero (militarized Cessna 172 trainer) and the hours and hours of study, quizzing and bookwork associated with learning to fly that simple airplane. The first part of every Air Force flight training day typically begins with “stand up”, where the students are quizzed and then given a hypothetical emergency scenario they must correctly solve from memory, on their own, all while standing in front of their peers. All my builds attempt to convey some aspect of the piloting experience, from how they fly, to making the player remember their fuel state or pay the consequence (I never, ever use unlimited fuel), or remembering some detail regarding the plane’s flight characteristics that will keep them “alive”, etc. That’s partially why I do things this way, thanks for commenting.

    +1 5 months ago
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    It's a beautiful plane but the discription is so long it's impossible to remember everything.

    +1 5 months ago
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    BEST

    5 months ago
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    34.5k AdlerSteiner

    Beautiful.

    6 months ago
  • Profile image
    26.8k ChiChiWerx

    @MrAir420 I used the following Funky Trees formula for the horizontal stabilizer input: “clamp((clamp((Pitch+Trim/1)+(GearDown/8),-1,1)(1-clamp01(floor(TAS/335))0.33)),-1,1)”. The part of the equation which limits the movement is the “clamp01(floor(TAS/335))*0.33))” in which the movement is only limited when the result of TAS/335 is a positive value by the “clamp01”, that is, when the aircraft True Airspeed exceeds 335 m/s. Then, the rotator is then limited to 2/3 it’s total movement when the aircraft speed exceeds 335 m/s. The transonic maneuverability transition a bit abrupt and if I were to do it again, I might attempt to make a smoothly decreasing pitch rate, but it does the job. Thanks for asking and if you have any further questions, please don’t hesitate to ask.

    +1 6 months ago
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    1,730 MrAir420

    Can you describe how did you make this thing that controls become less effective on the high speeds?

    +1 6 months ago
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    @ChiChiWerx If Simple Planes does one thing, it lets everyone be a test pilot. Few other games or simulators allow you to experience bugged flight controls, murderously slim performance envelopes, or the simple joy of half your aircraft mysteriously disintegrating for no apparent reason.

    My lizard brain just went "Oh, left is right and right is left whenever I try to do something stupid. Ok." Eventually I was able to translate that into "Stop doing stupid things" but for the first five minutes I was perfectly happy just using reverse inputs while twisting around in ways that would probably have drained all the blood from my head IRL.

    +1 6 months ago
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    @ChiChiWerx I'm okay, thank you, but the atmosphere here is pretty sad.
    We are facing the worst phase of the contagion, but we intervened quick when it started and limited losses and damage.
    Others are not doing great, like Spain for example..
    Let's hope for the best.

    6 months ago
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    @Freerider2142 Pretty much. The engines, radar, 20mm cannon and payload were all perfectly adequate in the 50's and 60's but tech moved forward..

    +1 6 months ago
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    @F104Deathtrap yup, it was just limited by it's engines, and low payload capabilities.
    which is why the whole F-16 VS YF-17 competition started to begin with ;)

    +1 6 months ago
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    @Freerider2142 It was a joke, amigo. The F-5 was a design well ahead of it's time, but the technology inside of it wasn't. As a result, you can see time and again where the design itself impacted the world of aviation in the form of newer aircraft using better technology and the solid F-5 design as a starting point.

    +2 6 months ago
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    @ChiChiWerx It is a descendant for sure, But it is not the same aircraft in any way.
    It's not a USN F-5.
    it was made by the same company, but saying they are the same is just Wrong.

    +1 6 months ago
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    26.8k ChiChiWerx

    What’s ironic was that the F-20, which in itself was really an improved F-5E, was powered by the same engine as the twin engine F-18, the GE F404 turbofan.

    +2 6 months ago
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    26.8k ChiChiWerx

    @Freerider2142 no, he’s correct, the F-17, which eventually became the F-18, was a direct descendent of the F-5E, but vastly improved and more sophisticated.

    +3 6 months ago
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