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Bell XH-40


Turbine-Powered Helicopter Prototype


United States | 1956



"The Bell XH-40 was the origination of the famous Bell UH-1 Huey series of utility helicopters used by the American military and others."



Authored By: Staff Writer | Last Edited: 03/14/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
The helicopter as an over-battlefield commodity was proven for the Americans during the fighting of the Korean War (1950-1953). This showing propelled the United States Army to investigate broadened use of the type in, particularly in contested areas where helicopters proved a life saving measure for the wounded. The war resulted in greater investment by the service in rotorcraft that could respond to casualty evacuation and other roles where Vertical Take-Off and Landing (VTOL) was required.

Against this backdrop in 1955, Bell Helicopter, funded by a U.S. Army contract, began work on a prototype helicopter design that was to be powered by a turbine engine. This powerplant was already trialed through a Model 47 (as the "XH-13") to prove the basics of the arrangement sound. The step up to using the larger, heavier "Model 204" offered its own challenges but success was already within reach. As a military prototype, the Model 204 was designated as the "XH-40" and went to the air for the first time on October 22nd, 1956. The following year, two more prototypes were added to the development stable and, in 1958, no fewer than six helicopters - with lengthened cabins - under the developmental "YH-40" designation were delivered for further testing by the Army.

The design was refined after feedback from the service but Army authorities were convinced in the new helicopter, and its more capable turbine arrangement, that it adopted the YH-40 into service as the UH-1 "Huey" - the symbol of the American involvement in the Vietnam War (1955-1975) and the first mass-produced turbine-powered helicopter anywhere in the world.

As finalized, the aircraft had a two-person crew with side-by-side seating in the heavily-windowed cockpit and room in the cabin for additional personnel. The passenger cabin was accessed through sliding side doors while the pilots had access through hinged, automobile-style doors at front. The engine was mounted over and behind the passenger cabin and drove a twin-bladed main rotor unit overhead and a twin-bladed tail rotor unit set to starboard. A shaft connected the powerplant to the rear rotor under the framework of a tail stem. The engine exhausted from a circular port over the tail stem itself. Ground-running was handled by a simple twin-landing skid arrangement which allowed the helicopter to take-off and land from virtually anywhere.

For its time in the air, the XH-40 stood as the progenitor to one of the most well-known and successful rotorcraft in aviation history, its form and function influencing a long-standing line of helicopters that is embodied today by such types as the United States Marine Corps' UH-1Z "Venom" (detailed elsewhere on this site).

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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 Bell XH-40 Turbine-Powered Helicopter Prototype.
1 x Turbine engine driving a two-bladed main rotor over the fuselage and a two-bladed tail-rotor unit set to starboard.
Propulsion
124 mph
200 kph | 108 kts
Max Speed
16,404 ft
5,000 m | 3 miles
Service Ceiling
217 miles
350 km | 189 nm
Operational Range
1,200 ft/min
366 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 Bell XH-40 Turbine-Powered Helicopter Prototype.
2
(MANNED)
Crew
55.1 ft
16.80 m
O/A Length
48.1 ft
(14.65 m)
O/A Width
14.4 ft
(4.40 m)
O/A Height
3,307 lb
(1,500 kg)
Empty Weight
7,716 lb
(3,500 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
Variants
Notable series variants as part of the Bell XH-40 family line.
XH-40 - Base prototype Designation; three constructed for testing in 1956-1957.
YH-40 - Six pre-series helicopters used for additional testing; delivered in 1958.
Operators
Global customers who have evaluated and/or operated the Bell XH-40. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 9 Units

Contractor(s): Bell Helicopter - USA
National flag of the United States

[ United States ]
Relative Max Speed
Hi: 150mph
Lo: 75mph
Aircraft Max Listed Speed (124mph).

Graph Average of 113 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
9
36183
44000
Entry compared against Ilyushin IL-2 (military) and Cessna 172 (civilian) total production.
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
Aviation Timeline
EarlyYrs
WWI
Interwar
WWII
ColdWar
Postwar
Modern
Future
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Image of the Bell XH-40
Image from the Public Domain.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
MEDEVAC
SEARCH & RESCUE
TRANSPORT
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 Bell XH-40 Turbine-Powered Helicopter Prototype appears in the following collections:
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