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====== Fw 190 D-9 (“Dora”) — Summary ======
===== 1. Overview =====
Derivative: A long-nose derivative of Fw 190A (air-cooled) fitted with the liquid-cooled V-12 Jumo 213A-1 (“Dora”).
Main intent of modifications: Adoption of an annular radiator to limit drag increase while concentrating structural changes mainly in the nose section.
First flight: September 1942.
Production & service: Mass production from Aug 1944 → frontline allocation in Nov → combat use from Dec.
High-altitude suitability: Turbo-supercharger and cockpit pressurization ultimately not adopted. While it avoided the sharp high-altitude power drop seen on the A-series, the D-9 was fielded as a transitional high-speed fighter.

===== 2. Airframe & Propulsion =====
Engine: Jumo 213A-1 (liquid-cooled V-12) with MW50 (10 minutes continuous per use, 40 minutes total).
Overall length: 8.95 m → 10.192 m (nose approx. +50 cm, rear fuselage approx. +49 cm).
Empennage: Enlarged vertical tail (for stability).
Intake: Supercharger intake protruding on the starboard nose.
Cooling: Annular radiator mounted ahead of the engine.
Pressurization: No pressurized cockpit in the final configuration.
Turbo: No turbo-supercharger.

===== 3. Engine Power =====
^ Condition / Altitude ^ Power (hp) ^
| Takeoff (rating) | 1,776 |
| 5,800 m | 1,600 |
| With MW50 (10 min / 40 min total) | ~2,240 |
| 9,800 m | ~1,020 |

===== 4. Performance =====
^ Item ^ Condition ^ Figure ^
| Maximum speed | at 6,400 m | 698 km/h |
| Maximum speed (MW50) | at 6,200 m with MW50 | 732 km/h |
| Service ceiling | — | 13,200 m |

===== 5. Handling / Armament / Equipment =====
Handling: Roll performance decreased as the price for higher speed; however, pilot evaluations were generally favorable after familiarization.
Fixed armament:

Nose: MG 131 13 mm × 2 (475 rpg)

Inboard wings: MG 151/20 20 mm × 2 (250 rpg)
Protection: 12 mm armor plate behind the pilot / 50 mm armored windscreen in front.
Ordnance: ETC501 / ETC504 centerline rack for bombs.
Canopy: About 300 early aircraft retained the earlier canopy; later machines adopted the “Galland” blown canopy for better visibility.
All-weather variant R11 (operational contribution: ○): canopy de-icing, FuG 125 radio navigation/landing guidance, LGWK 23 course indicator, PKS 12 autopilot. Other planned sub-variants saw little or no operational use.

===== 6. Production & Allocation =====
^ Category ^ Figures / Notes ^
| D-9 + D-9/R11 | ~750 aircraft (per some sources) |
| D-series total | 1,805 aircraft (per some sources) |
| D-9 only | 1,826 produced, but ~300 said to have seen combat (per another account) |

(Notes) Figures vary by scope definitions (D-9 only vs. entire D-series; completed vs. accepted vs. operational). When citing, specify the coverage and basis of each number.

===== 7. Operational Assessment (Highlights) =====
Background: Bombing of BMW plants depressed A-series output → D-9 brought forward into mass production.
Combat: Entered combat by Dec 1944, but the Luftwaffe fighter arm suffered heavy losses during the “Wacht am Rhein” (Ardennes) offensive that month.
Overall judgment: The airframe possessed credible potential against late-war Allied fighters, yet the lack of seasoned pilots and overwhelming material inferiority meant it could not alter the strategic picture.
Designer’s view: For Kurt Tank, the D-series was a stopgap, with Ta 152 as the true objective. Anecdotally, voicing this view hurt unit morale.

===== 8. Comparative Assessments =====
Nohara & Shiwaku (1990); Nohara (2003): Emphasize aerodynamic refinement, the annular radiator’s advantages, and power superiority (approx. 1,750 hp for D-9 vs. ~1,450 hp for P-51), suggesting that in pure dogfight terms the D-9 could surpass the P-51.
Rekishi-Gunzō (2010): While German sources rated the D-9 as comparable to the P-51D, much published data rely on estimated figures, and actual performance may have been slightly inferior to the latest Allied types.

===== 9. Timeline (Concise) =====
^ Date ^ Event ^
| Sep 1942 | First flight |
| Late Jun 1944 | Two prototypes completed |
| Aug 1944 | D-9 mass production begins |
| Nov 1944 | Frontline allocation begins |
| Dec 1944 | Combat debut (coinciding with the Wacht am Rhein / Ardennes period) |

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