Heinkel HD-20 Observation Plane Aircraft 1927 Article

Heinkel HD-20 Observation Plane Aircraft 1927 Article

2 actual pages make up this article.

photo captions: "The German Heinkel HD-20 observation and photographic airplane which is equipped with two Wright Whirlwind 200 hp air-cooled engines."   ***   "Another view of the Heinkel HD-20 (two Wright Whirlwinds).

"A German Twin-Engine Military or Commercial Machine with Whirlwind Engines."

"..Ernest Heinkel, of Germany, has earned an enviable reputation as a designer of planes which were somewhat out of the ordinary. His specialty has been simplicity of construction and ease of dismounting and assemblage. His latest product the HD-20 is fitted with two Wright Whirlwind engines and is designed for observation work. The twin-engine principle has many advantages for photographic work. It allows a degree of visibility forward and to the sides which cannot be obtained in a single-engine plane. Also, photographic planes are invariably used over cities or over extremely rugged mountainous country where a successful forced landing would be impossible. The low power loading and the comparatively low wing loading enable the plane to fly comparatively easily on one engine. The reserve power gives a high rate of climb and the ceiling of 16,400 ft., in the case of the Heinkel HD-20 can be reached in 35 minutes.  The plane is a biplane with a small lower wing and a large upper wing. The wings are heavily staggered and the gap is large. The wing tips are rounded but not tapered in thickness. The ailerons are in the upper wings only............................."

continues on to a separate page 2, which also shows a plan drawing of the HD-20

There is some very mild foxing (tiny yellow/brown spotting) outside edges. There is a crease up the middle of the lower portion of pages. There is a crease on the right edge margin from viewing when this item was bound.

The date appears in the upper margin, it does not show in the scanned image.

It has become harder to locate these old items. It is likely that many of these will not come our way again as they were published only once.

1927 Aviation Publication Advertisement

Approximate Dimensions 8" X 11 1/2"

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