May 262012
 
NACA and the Convertible Aircraft, 1945-9

The convertible aircraft, a vehicle which can function either as a direct lift, rotary aircraft or as fixed wing airplane, with conversion from one to the other type as required, has long been a dream of aeronautical inventors. Combining the vertical flight capacity of the helicopter with the greater efficiency in forward flight of the […]

Apr 142012
 
Bell XF-109 VTOL Fighter Brochure and Mock-up Inspection Program (1959)

In our final article in a series on the Bell D188A/Model 2000 (a.k.a. XF-109 / XF3L—both spurious designations invented by the Bell marketing department) supersonic VTOL fighter of the late 1950s, we present a brochure and mock-up inspection guide dating from February 1959. A preview of the brochure is shown to the left; it is remarkable for being […]

Mar 232012
 
Bell D188A/Model 2000 VTOL Fighter Mock-up Report—February 1959

[adrotate banner=”8″] [adrotate banner=”1″]In our latest article in a series on the Bell D188A/Model 2000 (a.k.a. XF-109 / XF3L—both spurious designations invented by the Bell marketing department) supersonic VTOL fighter of the late 1950s, we present this huge, heavily illustrated mock-up report dating from February 6, 1959. By this time, the Air Force had become a significant partner […]

Jan 092012
 
Bell D188A/Model 2000 VTOL Fighter Reports—January to February 1959

[adrotate banner=”8″] [adrotate banner=”1″] In our latest article in a series on the Bell D188A/Model 2000 (a.k.a. XF-109 / XF3L) supersonic VTOL fighter of the late 1950s, we present a pair of Bell reports from early 1959—a Progress Report from January and a report on Experimental Model Programs dating from February 6. In the abstract to the Progress […]

Nov 302011
 
Verticraft Tri-Service VTOL Prototype Transport Aircraft

[adrotate banner=”8″] [adrotate banner=”1″]The Verticraft Verticar was a little known VTOL aircraft design belatedly submitted to the Navy in connection with the Tri-Service Assault Transport competition of 1961. This competition was born of a common requirement by the United States Army, Navy and Air Force for a V/STOL aircraft that could augment helicopters in transport-type […]

Nov 222011
 
Bell D188A/Model 2000 VTOL Fighter Reports—September to December 1958

[adrotate banner=”8″] [adrotate banner=”1″]In our latest article in a series on the Bell D188A/Model 2000 supersonic VTOL fighter of the late 1950s, we present more primary documents concerning this aircraft in a chronological sequence, specifically Bell progress reports and correspondence in the September—December 1958 period. In the paragraphs below, we reproduce the abstracts of each report, which […]

Nov 062011
 
Bell D188A/Model 2000 VTOL Fighter Reports—April to August 1958

[adrotate banner=”8″] [adrotate banner=”1″] In our latest article in a series on the Bell D188A (a.k.a. XF-109 / XF3L) supersonic VTOL fighter of the late 1950s, we present more primary documents concerning this aircraft in a chronological sequence, specifically Bell progress reports and correspondence in the April—August 1958 period. First we have a Bell Progress Summary from […]

Oct 232011
 
Bell D188A VTOL Fighter Documents—February to March 1958

[adrotate banner=”8″] [adrotate banner=”1″] In our latest article in a series on the Bell D188A (a.k.a. XF-109 / XF3L) supersonic VTOL fighter of the late 1950s, we present more primary documents concerning this aircraft in a chronological sequence, specifically Navy Bureau of Aeronautics (BuAer) correspondence and a detailed Bell armament report from the February—March 1958 period. First […]

Oct 122011
 
Bell D188A VTOL Fighter Mock-up Summary Report—January 1958

[adrotate banner=”8″] [adrotate banner=”1″] In our latest article in a series on the Bell D188A (a.k.a. XF-109 / XF3L) supersonic VTOL fighter of the late 1950s, we present a Mock-Up Summary Report from January 1958. The first portion of the introduction to the report is reproduced below. The configuration inspection of the Bell D188A VTOL (Vertical Take-Off and Landing) Aircraft took […]

Oct 122011
 
Bell D188A VTOL Fighter Reports—December 1957

[adrotate banner=”8″] [adrotate banner=”1″]In our seventh article in a series on the Bell D188A (a.k.a. XF-109 / XF3L) supersonic VTOL fighter of the late 1950s, we present a pair of Bell reports from December 1957, along with some internal BuAer correspondence critiquing the design. The first document is Progress Report No. 5 dating from December 15, 1957. […]

Oct 042011
 
Stiller Helicopter Project of 1928

[adrotate banner=”8″] [adrotate banner=”1″] On January 1, 1928, brothers I. and J. Stiller, both of whom were engineers living in Radom, Poland, filed a patent in Warsaw for a peculiar helicopter design featuring two small propellers fitted on the upper end of swiveling shafts arranged in parallel. These propellers were driven by an internal combustion engine […]

Sep 182011
 
Bell D188A VTOL Fighter—Design Data Summary, November 1957 (Part 3)

[adrotate banner=”8″] [adrotate banner=”1″]In our sixth article in a series on the Bell D188A (a.k.a. XF-109 / XF3L) supersonic VTOL fighter of the late 1950s, we present the final portion of a huge Bell design data summary from November 1957, which features 63 drawings of the aircraft and its various components. Please click through the gallery above […]