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Seibel S-4 Skyhawk / YH-24 helicopter

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Specifications Comment this helicopter
Picture S-4
General
Manufacturer Seibel
Type S-4 Skyhawk / YH-24
Introduced 11/1/1951
In production? No
Units produced 2
Price US $ 0.00
Dimensions
Overall Length 0 ft
Length 27.82 ft
Height 10 ft
Width 0 ft
   
   
Description

The S-4 (aka. YH-24 or “Skyhawk”) was a light helicopter built by the Seibel Helicopter company. It first took flight in January of 1949.

The S-4 is a more advanced continuation of the experimental S-3, which only existed to prove the feasibility of some of Charles Seibel’s designs. The US military were in contact with Seibel, providing feedback on the S-4, which has potential as a light military aircraft. The Air Force too was interested and it was the US armed forces that dubbed the S-4 the Skyhawk.

Just as with the S-3, the S-4 made use of only a single engine and a very simplified two-bladed rotor. The transmission too was relatively simple compared to other contemporary designs.The anti-torque system also featured a two-bladed design mounted on the tail boom.

The frame of the S-4 was a welded box frame made from steel tubing. It had two decks. The lower deck had the control panel, pilot's seat, wheeled trike landing gear and a relatively small passenger or cargo area.

While the Army and Air Force showed interested and evaluated the two prototypes that were built, ultimately the S-4 did not have enough load capacity or power for their needs and it was passed on.

The Cessna CH-1 Skyhook would however be borne from the S-4B’s design and is the only helicopter ever to be made by Cessna.

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Design features
  • Bearingless and hingless rotorhead design by attaching the rotors to the mast by means of bended metal sheets
  • Stepped, steel tube box frame with two decks
  • Direction control by shifting the center of gravity so no need for cyclic control.
  • Tapered, monocoque tailboom.
  • Tricycle landing gear
Description

The S-4 (aka. YH-24 or “Skyhawk”) was a light helicopter built by the Seibel Helicopter company. It first took flight in January of 1949.

The S-4 is a more advanced continuation of the experimental S-3, which only existed to prove the feasibility of some of Charles Seibel’s designs. The US military were in contact with Seibel, providing feedback on the S-4, which has potential as a light military aircraft. The Air Force too was interested and it was the US armed forces that dubbed the S-4 the Skyhawk.

Just as with the S-3, the S-4 made use of only a single engine and a very simplified two-bladed rotor. The transmission too was relatively simple compared to other contemporary designs.The anti-torque system also featured a two-bladed design mounted on the tail boom.

The frame of the S-4 was a welded box frame made from steel tubing. It had two decks. The lower deck had the control panel, pilot's seat, wheeled trike landing gear and a relatively small passenger or cargo area.

While the Army and Air Force showed interested and evaluated the two prototypes that were built, ultimately the S-4 did not have enough load capacity or power for their needs and it was passed on.

The Cessna CH-1 Skyhook would however be borne from the S-4B’s design and is the only helicopter ever to be made by Cessna.

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Design features:
  • Bearingless and hingless rotorhead design by attaching the rotors to the mast by means of bended metal sheets
  • Stepped, steel tube box frame with two decks
  • Direction control by shifting the center of gravity so no need for cyclic control.
  • Tapered, monocoque tailboom.
  • Tricycle landing gear
Performance
Persons 2
Max. Range 0 mi
Cruise Speed 58 mph
Max. Speed 62 mph
Max. rate of Climb 0 ft/min
HOGE ceiling 0 ft
Service Ceiling 4298 ft
Gross Weight 1529 lb
Empty Weigt 946 lb
Useful Load 583 lb
Dynamic system
Fuel Capacity 0 gallons
Number of Engines 1
Engine Type Piston
Engine Code Lycoming O-290-D
Horse Power 127
Rotorhead Bearing and hingless design
Number of rotorblades 2
Rotor Diameter 29.13 ft
Number of tail rotorblades 2
Tailrotor Diameter 0 ft
Blueprints & model
Manufacturer Website manufacturer..
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