Hiller X-18

 

The Hiller X-18, begun in February 1957, used various components from existing aircraft. The fuselage was that of a Chase YC-122C transport. The two wing-mounted 7,100 eshp Allison T40-A-14 turboshafts came from the XFY-1/XFV-1 tailsitter (#23 and #24) program and could not be cross-linked. It had three engines, the two turboprops drove the 16 ft diameter counter-rotating three-bladed propellers and a 3,400 lb thrust Westinghouse J34 turbojet which produced pitch control thrust.

 

The 33,000 lb loaded X-18 underwent extensive ground tests beginning in December 1958, and made its first conventional flight on 24 November 1959. It made partial conversions with wing angles of up to 33° (relative to the fuselage) -- with a 17° nose-up attitude, the wings had an effective 50° degrees of tilt (relative to the flight path). The turboprop engines had electric pitch controls and were too slow to provide adequate response in hover. On the 20th flight it had a propeller pitch control problem at 10,000 ft and went into a spin. It was recovered before impact, but was grounded, having never achieved hover. It continued to test ground effects before it was damaged by a test stand failure.

 

 Source: AHS V/STOL Wheel

 

 

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Overview
Parent type *No Type assigned
Variant *No Variant assigned
Design authority Hiller Aircraft Corporation
Primary manufacturer Hiller Aircraft Corporation
Key Characteristics
Operational status No longer flying
Max gross weight (ground) 14,969 kg 33,000 lb
Crew 2
Seating arrangement Side-by-side
Configuration
VTOL type Convertiplane
Compound type Lift
Lift configuration Tilt wing
Control device type Thruster
Features
Number of engines 3
Number of propulsors 0
Number of lift devices 4
Number of control devices 1
Milestones associated with the Hiller X-18
1959 First flight of the Hiller X-18

Hiller X-18

 

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Hiller X-18

 

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Hiller X-18

 

This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.

 

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Hiller X-18

 

This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.

 

If you are not a member of AHS, why not join today? Be sure to also check out the many benefits enjoyed by AHS members.

 

Hiller X-18

 

This content is reserved for AHS members. If you are a current member, please use the Member Login link at the top of the page.

 

If you are not a member of AHS, why not join today? Be sure to also check out the many benefits enjoyed by AHS members.

 

Hiller X-18

 

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Hiller X-18

 

Forum Proceedings related to the Hiller X-18

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Vertiflite articles related to the Hiller X-18

Vertiflite, Fall/Winter 2001

The X-18 Tilt-Wing - Lessons Learned -

 

 

Content from the AHS website related to the Hiller X-18

 

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Hiller X-18

 

Hiller X-18

Aircraft Notes

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