The aircraft of this class designed in 1915 He was awarded the designation RBVZ C-18. Their main purpose was to be the support of distant bombing devices during flights in the deepest rear. Apart from maintenance tasks, plane C-18 could take on board the bomb load allowing to make the support of offensive operations "Muromtsev." Plane in the version without the bomb load, according to the project, was able to serve Strike Fighter, causing sudden loss of the enemy, who flew into our area.
For RBVZ C-18 scheme was elected four-post biplane having a common tail. Plane in front of the fuselage had two crew cabins. A pair of engines located on the lower wing.
Engines "Senbim" were equipped with liquid cooling and during frontal vodoradiatorah installed seemingly backwards, in other words the output shafts for a couple of push screws. Were taken such as radiators, as RBVZ-C-1F (which are pulling the screws) with the central untapped holes for the trees on the Rights of the finished products. Fuel was located in the longish tubular tanks with spherical end caps. Bucky hung over the motor to the upper wing. Feeding was carried out by gravity. Each slider was attached to the truss tool trays that are installed between the 2 indoor racks along the span biplane wing box. These stands under the lower wing of the force had continued, which did a U-shaped landing gear converging to two protivokapotazhnym lyzhitsam at the sight in front, carrying a winding two-wheeled carts with rubber shock absorbers Corded their axes.
The entire length of the fuselage fighter had a rectangular cross-section. In the bow area of the fuselage was shaped blade chisel. According to the views of builders, having such a shape, it would be better to cut the airflow. On the other hand, this form of the front of the line with a more comfortable arrangement of the arrow, to invest in a sitting (idle) position your feet into the resulting cavity konusnovidnuyu. Further, for the open cockpit arrow on top of your enclosures are convex conical fairing windshield going to the cockpit, which had its own seat on a certain elevation above the first member of the crew for the best view. The tail area of the fuselage equipped with units of feathers: a triangular keel, rudder stabilizer with hinged on them. Handlebars different curved outline, having the form of a butterfly's wings. Profile of the horizontal and vertical tail was flat. At the bottom of the rear fuselage installed tubular crutch having an internal shock cord. Steering wheels swivel and height were open plate-control wiring cables on the way to the outer rocker.
At the stage of layout work it became clear that to perform combat missions aircraft is required to have one more tail firing point. Since it was necessary for the third member of the crew, the project C-18 was a real incarnation as a single airplane.
The construction of a distant fighter escort by the contract, the 12th and was completed in the middle of the 16th year. Trial runs podlety and made himself the chief designer — II Sikorsky to mind all working RBVZ. In the first flight of the C-18 and was attended by other pilots, who worked in a factory and pilots from the War Office. For example, it flew SK Modrow, IA Eagles, etc. During the industrial tests on the unit weapons have not set. Combat load simulated using sandbags. Because of the lack of debugging engines "Senbim" they did not develop the capacities stated and quite often gets overheated. In connection with this plane, at full load, which was provided for the project assignment, could not get off the ground. II Sikorski criteria wartime attempted rescue apparatus, which late to be used in combat. Instead of water cooling engines for aircraft C-18 was equipped with two tandem engines "Ron," which had a huge total capacity than the two sub-standard "Senbimov." For the closing of each 2-multidirectional engines between the lower wing spars installed two additional crosses. power beams with mounting flange for supporting the crankshafts. External (front and rear) shaft ends which revolve along with cylinders played on a two-blade propeller: front untwisted pulling screws, rear engines — a couple pushing screws that were spinning in the same plane, the propellers of the previous version of the power band. The designers at the time of completion RBVZ C-18 military remembered the recommendation to make an extra point rifle that will protect the unit from the rear hemisphere. To ensure this protection behind the pilot's seat chair set shooter. Cab front gunner moved forward. Appearance nasal area C-18 aircraft left not very aesthetically pleasing, but has been kept in the longitudinal alignment of the unit boundaries that are needed for non-hazardous operations. Weight fighter was markedly increased, but this did not prevent successful operation of the airplane and the deposit in the middle of May 17 th, the details of its implementation of the combat there. Hitherto unknown to the fate and photographs by both versions of the C-18.
Tactical flight properties RBVZ C-18:
Aircraft — RBVZ-With-18;
Year of construction — 1916;
Another designation — C-18;
Powerplant — 2x'' Senbim-Arab ";
Maximum capacity — 2×200 HP;
Maximum speed at sea level — 100 km / h (with a load of 240 kg — incomplete tanks, one pilot);
Service ceiling — 2050 m (with a load of 240 kg);
Takeoff — 60 m;
Wing area — 58.0 m;
Take-off weight — 2100 kg;
Empty weight — 1485 kg
The supplies of fuel — 380 kg;
Specific load Wing — 36.2 kg / m ';
Specific load capacity — 5.25 kg / hp.;
Weight efficiency — 28.5%.
Aircraft — RBVZ-C-18;
Year rem. — 1917;
Another designation — C-18bis
Powerplant — 4 "Ron";
Maximum capacity — 4×100 HP;
Maximum speed at sea level — 120 km / h;
Time to climb to 1000 meters — 7 min.
Time climb 3000 m — 42 min.
Service ceiling — 3700 m;
Flight duration — 2.8 hours;
Path length — 70 m;
Wing area — 58.0 m;
Take-off weight — 2185 kg;
The supplies of fuel — 540 kg;
Specific load on the wing — 37.6 kg / m ';
Specific load capacity — 6.83 kg / hp.