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Kellett XR-10 helicopter

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Specifications Comment this helicopter
Picture XR-10
General
Manufacturer Kellett
Type XR-10
Introduced 4/24/1947
In production? No
Units produced 2
Price US $ 0.00
Dimensions
Overall Length 0 ft
Length 29.17 ft
Height 0 ft
Width 0 ft
   
   
Description

The XR-10 was an experimental transport helicopter built for the US military by Kellet Autogiro. It first took flight in April of 1947.

The XR-10 was designed to be a military transport helicopter but only ever flew as a prototype. Just as its XR-8 sibling did. Kellet designed the XR-10 in response to a published requirement by the US military for a transport helicopter that could move passengers, cargo and wounded within an enclosed fuselage.

At this early stage in helicopter history it was typical for the interior cabin of the craft to be exposed to the atmosphere since weight had to be saved. Power to weight ratios were relatively poor at the time and therefore lift power was limited.

Since Kellet had already done significant design work on the XR-8, the XR-10 inherited many design features from it. Most notable the twin meshed rotors, each driven by its own engine.

This configuration would provide enough lift to allow for an enclosed transport helicopter. At least in theory.

At first glance the XR-10 simply looks like a bigger XR-8, but upon closer inspection one notes that the twin engines each rest on a nacelle that drives a rotor through long shafts. Also, while the XR-8 had some fabric skin, the XR-10 was entirely skinned in metal.

When the first prototype XR-10 first took flight, it was the largest rotorcraft to ever fly in the United States. However, the XR-10 also inherited the XR-8’s main flaw. The main rotors tended to have blade collisions. This problem was fixed, but when the first prototype had a control failure and killed Kellet’s chief test pilot, the project was abandoned.

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Design features
  • Intermeshing rotors, synchronized by a cross drive
  • Engines mounted on nacelles
  • Tricycle landing gear
  • All metal fuselage
Description

The XR-10 was an experimental transport helicopter built for the US military by Kellet Autogiro. It first took flight in April of 1947.

The XR-10 was designed to be a military transport helicopter but only ever flew as a prototype. Just as its XR-8 sibling did. Kellet designed the XR-10 in response to a published requirement by the US military for a transport helicopter that could move passengers, cargo and wounded within an enclosed fuselage.

At this early stage in helicopter history it was typical for the interior cabin of the craft to be exposed to the atmosphere since weight had to be saved. Power to weight ratios were relatively poor at the time and therefore lift power was limited.

Since Kellet had already done significant design work on the XR-8, the XR-10 inherited many design features from it. Most notable the twin meshed rotors, each driven by its own engine.

This configuration would provide enough lift to allow for an enclosed transport helicopter. At least in theory.

At first glance the XR-10 simply looks like a bigger XR-8, but upon closer inspection one notes that the twin engines each rest on a nacelle that drives a rotor through long shafts. Also, while the XR-8 had some fabric skin, the XR-10 was entirely skinned in metal.

When the first prototype XR-10 first took flight, it was the largest rotorcraft to ever fly in the United States. However, the XR-10 also inherited the XR-8’s main flaw. The main rotors tended to have blade collisions. This problem was fixed, but when the first prototype had a control failure and killed Kellet’s chief test pilot, the project was abandoned.

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Design features:
  • Intermeshing rotors, synchronized by a cross drive
  • Engines mounted on nacelles
  • Tricycle landing gear
  • All metal fuselage
Performance
Persons 12
Max. Range 350 mi
Cruise Speed 84 mph
Max. Speed 100 mph
Max. rate of Climb 0 ft/min
HOGE ceiling 0 ft
Service Ceiling 15000 ft
Gross Weight 15380 lb
Empty Weigt 9550 lb
Useful Load 5830 lb
Dynamic system
Fuel Capacity 0 gallons
Number of Engines 2
Engine Type Piston
Engine Code Continental R-975-15
Horse Power 425
Rotorhead Intermeshing
Number of rotorblades 3
Rotor Diameter 71 ft
Number of tail rotorblades 0
Tailrotor Diameter 0 ft
Blueprints & model
Manufacturer Website manufacturer..
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