Junkers Ju 87 withstand dives of . The Jumo 211D in-line engine was installed, replacing the R-1s Jumo 211A. Due to an increase in overall weight by , the Ju 87 R-2 was slower than the Ju 87 B-1 and had a lower service ceiling. The Ju 87 R-2 had an increased range advantage of . The R-3 and R-4 were the last R variants developed. Only a few were built. The R-3 was an experimental tug for gliders and had an expanded radio system so the crew could communicate with the glider crew by way of the tow rope. The R-4 differed
Curtiss Aeroplane and Motor Company doing what we can to help one another." In 1909, the AEA was disbanded and Curtiss formed the Herring-Curtiss Company with Augustus Moore Herring on March 20, 1909, which was renamed the Curtiss Aeroplane Company in 1910. The Curtiss Aeroplane and Motor Company was created on January 13, 1916 from the Curtiss Aeroplane Company of Hammondsport, New York and Curtiss Motor Company of Bath, New York. Burgess Company of Marblehead, Massachusetts, became a subsidiary in February 1916. With the onset of World War I, military orders rose sharply, and Curtiss needed to expand quickly. In 1916, the company moved its