Rihn Design Series DR-107 One Design

Type
Single seat aerobatic competition aircraft

Design Features
Low wing monoplane with a specially designed symmetrical airfoil, 16% thick, conic nose and flat sides. Large symmetrical ailerons. Wire braced tail surfaces.

Structure
Fuselage has a welded steel tube truss covered with sheet metal from the firewall aft to the cockpit, fabric covered from the cockpit aft the tail. Aluminium sheet metal turtledeck. The tail surfaces are fabric covered and wire braced with steel tube spars and bent up steel sheet metal ribs. The one piece wing is all wood, Douglas Fir and Spruce spars, plywood ribs and plywood covered. Large span ailerons are built of wood and fabric covered. The fiberglass engine cowl is a two piece, split horizontally and is easily removable for ease in maintenance.

Flying Controls
Pushrod actuated ailerons and elevator, cable actuated rudder. Ailerons are mass balanced and aerodynamically counter balanced. Each aileron is fitted with a ground adjustable balance surface suspended below the aileron. A trim tab on each elevator also acts as a servo tab to reduce stick pressures.

Power Plant
One Lycoming O-320 (150 HP) removed from a Cessna 172. Modifications include inverted oil system, high compression pistons, and fuel injection. Driving a two blade fixed pitch Senescing aluminium propeller (74 inches diameter, 60 inches pitch). The fuel tank is located in the fuselage ahead of the cockpit, capacity is 18.5 gallons.

Landing Gear
Non-retractable tail wheel type, main gear is a one piece aluminium spring, tail wheel is steerable and full swivel mounted on a cantilever steel spring. Main wheels are 5.00 x 5 with hydraulic disk brakes.

Accommodation
An adjustable seat back nominally reclined to 30 degrees.

Systems
Electrical system of 12 volts. Electric engine starter.

specifications
 
powerplant
propeller
length
height
wing span
wing area
seats
empty weight
useful load
gross weight
fuel capacity
range
O-320 (150 HP)
two blade fixed pitch Senescing
17 ft
x
19 ft 4 in
75.55 sq ft
x
740 lb
x

1,000 lb utility
18.5 gal
x

performance

takeoff distance, ground roll
rate of climb
max speed
cruise speed
landing distance, ground roll
service ceiling
x
2,000 ft/min
184 mph
x
x
x

limiting and recommended speeds

design manoeuvring speed (Va)
never exceed speed (Vne)
stall, power off (Vsl)
landing approach speed
x
x
60 mph
x

All specifications are based on manufacturer's calculations