The B class blimps were patrol airships operated by the United States Navy during and shortly after World War I. The Navy had learned a great deal from the DN-1 fiasco. The result was the very successful B-type airships. Dr. Jerome Hunsaker was asked to develop a theory of airship design, Lt. John H. Towers had returned from Europe having inspected British designs, and using reports from attachés on British airship operations, the Navy was prepared to seek bids for blimps from American manufacturers. On 4 February 1917 the Secretary of the Navy directed that 16 nonrigid airships of Class B be procured. A February 12, 1917 meeting with the Chief of the Bureau of Construction and Repair, and representatives of Goodyear, Goodrich, Connecticut Aircraft Company, Curtiss Aeroplane and Motor Corporation, and U.S. Rubber Company, it was agreed that the order for 16 dirigibles was beyond the capability of any one company. The conference resulted in a committee to coordinate on sharing raw materials, information and experience. Ultimately Goodyear manufactured 9 envelopes, Goodrich made 5 and Curtiss assembled the gondolas for all of those 14 ships. Connecticut Aircraft contracted with U.S. Rubber for its two envelopes and with Pigeon Fraser for its gondolas. The Curtiss-built gondolas used by Goodyear and Goodrich used modified Curtiss JN-4 fuselages powered by Curtiss OXX engines. The Connecticut Aircraft blimps were powered by Hall-Scott engines. One ship, B-20 was equipped with a special control car. All B-Class airships were delivered to the Navy between August 1917 (B-1) and September 1918 (B-20). First flight The first flight of a B class blimp was made by the engineers who built it, Ralph Upson and Lt Preston, on May 24, 1917 at the White City Amusement Park, Chicago, Illinois, site where the B-1 had been assembled. Two more flights were made May 29, 1917. Leaving at midnight May 29, 1917 on B-1s fourth flight, Upson decided that since the B-1 was performing well he would rather not land at the small White City facility. Instead they would fly directly to the incomplete hangar at Wingfootlake. The B-1 was forced to land at Medina, Ohio due to an oil failure. Even with the forced landing the B-1 set a new record for distance flown. Both Goodyear and Goodrich used the White City Hangar to erect B-type airships. When the hangar at Wingfoot Lake near Akron Ohio became available in