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Dornier Do 635 (Zwilling) / (He 635 / Ju 635)


Long-Range Reconnaissance Aircraft Proposal


Nazi Germany | 1946



"The Dornier Do 635 was a proposed long-range reconnaissance platform centered around the joining of two Do 335 heavy fighter aircraft."



Authored By: Staff Writer | Last Edited: 05/30/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
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Firepower
Performance
Survivability
Versatility
Impact
Several German aircraft makers of World War 2 were convinced of the merits inherent in joining two aircraft by way of a common center wing section. This was most famously attempted by Heinkel with their He 111 medium bomber to produce the He 111Z "Zwilling" ("Twin") and the idea found even more success in America with the post-war North American F-82 "Twin Mustang" which saw combat service in the Korean War. The Dornier Do 635 existed as another short-lived attempt by German engineers to create a new "super aircraft" from an existing design.

The Do 635 was proposed during 1944 and the idea was simple enough on paper - join two examples of the promising Do 335 heavy fighter with a common center wing section while retaining all other original aspects of the high-performance fighter. The Do 335 was a unique fighter design in the grand scope of World War 2 as it showcased a pair of engines seated in line across a well-streamlined, cylindrical airframe. One engine was installed at the nose in a traditional "puller" arrangement and the other was fitted in the aft section of the fuselage in a "pusher" arrangement (behind the pilot's position). This combination of power made the Do 335 the fastest German prop-driven aircraft of the war but delays in acquiring the necessary engines led to fewer than forty examples delivered before the end of the conflict in Europe in May of 1945.

In the Do 335 "Zwilling" design, designated as Do 635, the aircraft was to retain the services of all four engines in their respective locations about the airframes. Each engine outputted 1,777 horsepower for a combined output of 7,108 horsepower. A crew of two was natural as each airframe was designed to hold one under their respective framed canopies. The combined fuselages generated a wingspan of 90 feet but more or less retained the same overall length (45.4 feet) and height (16.4 feet) of the original heavy fighter. Gross weight was estimated to be 72,532 pounds and performance specs included a top speed of 447 miles per hour with an impressive range out to 4,722 miles.

The unique arrangement of the aircraft provided generous operational ranges as output power and fuel stores were shared across both airframes. This played well into the intended role of long-range reconnaissance platform and onboard would be 2 x Rb 50 series cameras fitted to the portside fuselage. In addition to this, five target marker bombs would be carried to designate targets of opportunity. Due to the hefty weight of the aircraft, it was proposed to fit it with 2 x Walter rocket units for Rocket Assisted Take-Off (RATO). Landing would be conventionally accomplished as each airframe would retain its respective tricycle undercarriage.

Beyond a wind tunnel model, nothing else came of the Do 635 initiative as it was cancelled in February of 1945 amidst the worsening war situation for Germany. It is unknown what value this large aircraft would have had considering the Germans were embroiled in what was largely a defensive-minded war by this point and fighters /interceptors / night-fighters were the call of the day.

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Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Junkers Ju 635 Long-Range Reconnaissance Aircraft Proposal.
4 x Daimler-Benz DB603E V12 inverted liquid-cooled piston engines developing 1,777 horsepower each (two arranged in "puller" and two arranged in "pusher" configuration).
Propulsion
447 mph
720 kph | 389 kts
Max Speed
36,089 ft
11,000 m | 7 miles
Service Ceiling
4,722 miles
7,600 km | 4,104 nm
Operational Range
1,700 ft/min
518 m/min
Rate-of-Climb
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Junkers Ju 635 Long-Range Reconnaissance Aircraft Proposal.
4
(MANNED)
Crew
45.4 ft
13.85 m
O/A Length
90.1 ft
(27.45 m)
O/A Width
16.4 ft
(5.00 m)
O/A Height
49,604 lb
(22,500 kg)
Empty Weight
72,532 lb
(32,900 kg)
MTOW
Design Balance
The three qualities reflected below are altitude, speed, and range. The more full the box, the more balanced the design.
RANGE
ALT
SPEED
Armament
Available supported armament and special-mission equipment featured in the design of the Dornier Do 635 (Zwilling) / (He 635 / Ju 635) Long-Range Reconnaissance Aircraft Proposal .
None. Assumed photographic camera equipment carried for the reconnaissance role. Up to 5 x target marker bombs held in starboard side fuselage bay.
Variants
Notable series variants as part of the Dornier Do 635 (Zwilling) / (He 635 / Ju 635) family line.
Do 635 - Base Project Designation
Do 635 V-1 - Assumed first prototype
Operators
Global customers who have evaluated and/or operated the Dornier Do 635 (Zwilling) / (He 635 / Ju 635). Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 0 Units

Contractor(s): Dornier Flugzeugwerke / Junkers Flugzeug / Heinkel Flugzeugwerke - Nazi Germany
National flag of modern Germany National flag of Nazi Germany

[ Nazi Germany (cancelled) ]
Relative Max Speed
Hi: 500mph
Lo: 250mph
Aircraft Max Listed Speed (447mph).

Graph Average of 375 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
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Image of the Dornier Do 635 (Zwilling) / (He 635 / Ju 635)
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Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
RECONNAISSANCE
X-PLANE
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Dornier Do 635 (Zwilling) / (He 635 / Ju 635) Long-Range Reconnaissance Aircraft Proposal appears in the following collections:
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