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Dornier Do P.254 (Do 535 / He 535)


Mixed-Propulsion Heavy Fighter Aircraft Proposal


Nazi Germany | 1945



"The Dornier P.254 project was a mixed-powerplant version of the Do 335 Arrow heavy fighter - it did not proceed beyond the paper stage."



Authored By: Staff Writer | Last Edited: 01/22/2017 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
The Dornier Do P.254 project existed as a short-lived outgrowth of the Do 335 "Pfeil" ("Arrow") heavy fighter program. In the Do 335, an engine was fitted to the nose of the aircraft in the usual way ("puller" arrangement) but the airframe also made room aft for carrying a second engine, driving a propeller unit at the tail in a "pusher" arrangement. The combined powerplants made the Do 335 the fastest prop-driven aircraft to come out of Germany in World War 2. However, engine delays led to limited operational examples before the end of the war in 1945 and only thirty-seven or so were delivered. The aircraft project was also eclipsed by the Focke-Wulf Ta 152 high-altitude fighter.

The P.254 (Do 535) was to benefit from the foundation laid in the Do 335 in keeping the nose-mounted Daimler-Benz DB603A piston engine at the nose but substitute the tail propulsion system for a Heinkel-Hirth HeS 011 turbojet engine for an additional thrust output of 2,866lb. Theoretically, the P.254 would become an even faster prop-driven system than the Do 335 but it lacked swept-back wings benefitting flight at higher speeds. With the German Air Ministry favoring the more conventional, competing Ta 152 high-altitude fighter, Dornier engineers hoped the addition of a jet engine to their Do 335 would keep the promising heavy fighter program alive for a time longer.

It is unclear what over-battlefield role the P.254 would have had upon reaching operation service but it may have been in line with the usual German late-war push for viable fighters, interceptors and night-fighters needed to content with the Allied day-night bombing campaigns. There was most likely a secondary role of high-speed bombing to be built in.

Despite the venture, no P.254 aircraft were built from the existing Do 335 design and the program was eventually dropped from serious consideration - but not before being passed on to Heinkel during October of 1944 and recast as the He 535.

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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 Dornier Do P.254 Mixed-Propulsion Heavy Fighter Aircraft Proposal.
1 x Daimler-Benz DB603A 12-cylinder inverted engine developing 1,725 horsepower and driving a three-bladed propeller at the nose; 1 x Heinkel-Hirth HeS 011 turbojet engine in aft fuselage developing 2,866lb of thrust.
Propulsion
525 mph
845 kph | 456 kts
Max Speed
40,026 ft
12,200 m | 8 miles
Service Ceiling
932 miles
1,500 km | 810 nm
Operational Range
2,300 ft/min
701 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 Dornier Do P.254 Mixed-Propulsion Heavy Fighter Aircraft Proposal.
1
(MANNED)
Crew
45.4 ft
13.85 m
O/A Length
45.3 ft
(13.80 m)
O/A Width
14.9 ft
(4.55 m)
O/A Height
16,755 lb
(7,600 kg)
Empty Weight
22,267 lb
(10,100 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 P.254 (Do 535 / He 535) Mixed-Propulsion Heavy Fighter Aircraft Proposal .
ASSUMED (based on Do 335):
1 x 30mm MK 103 cannon firing through the propeller hub in nose.
2 x 20mm MG 151/20 cannons in engine cowling synchronized to fire through the spinning propeller blades.

OPTIONAL:
Up to 2,200lb of externally-held drop stores.
Variants
Notable series variants as part of the Dornier Do P.254 (Do 535 / He 535) family line.
P.254 - Base Project Designation
Do 535 - Alternative project designation
He 535 - Revised designation
Operators
Global customers who have evaluated and/or operated the Dornier Do P.254 (Do 535 / He 535). Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 0 Units

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

[ Nazi Germany (cancelled) ]
Relative Max Speed
Hi: 750mph
Lo: 375mph
Aircraft Max Listed Speed (525mph).

Graph Average of 563 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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1 / 1
Image of the Dornier Do P.254 (Do 535 / He 535)
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
AIR-TO-AIR COMBAT
GROUND ATTACK
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 P.254 (Do 535 / He 535) Mixed-Propulsion Heavy Fighter Aircraft Proposal appears in the following collections:
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