Beechcraft L-23 Seminole

The Beechcraft L-23 Seminole (later designated U-8) was the United States Armed Forces’ designation for the Beechcraft Twin Bonanza and Queen Air aircraft in its inventory. The U.S. Army adopted the Twin Bonanza as the L-23 in 1951, and it entered service as a light staff transport. The light transport proved to be a rugged, versatile addition to the Army's fixed-wing inventory. The civilian Twin Bonanza flew in versions L-23A through L-23E, while the Queen Air was the L-23F. In 1962, the L-23D was redesignated as U-8D, and the L-23F as U-8F. It remained in service from the 1950s until the early 1980s, with the last U-8Fs being retired in 1992.

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Jim Goodrich

Jim Goodrich is a pilot, aviation expert and founder of Tsunami Air.

What is the Beechcraft L-23 Seminole?

The Beechcraft L-23 Seminole was introduced in 1951. It entered service in 1952 as an Army liaison/utility transport. The Seminole was used by the U.S. Army as a light staff transport, and it offers hauling, liaison, VIP transport, and runs as a following plane. A total of 250 planes were produced, from 1952 to 1961. Uruguay and Turkey used the L-23/U-8 Seminole.

The U-8 is the military version of the Beech Model 50 Twin Bonanza. The U-8 was designated L-23 before 1962. The L-23 Seminole has two engines that make 340 horse power, and has a boosted extra motor choice. Due to the boosted extra motor, the L-23 Seminole fastest is 233 miles per hour. The L-23D’s fastest is 325 kilometers per hour (202 miles per hour). The L-23 Seminole’s service ceiling is about 5.8 kilometers (3.6 miles), and its range is a little over 1,609 kilometers (a thousand miles). The L-23 Seminole’s weight is about 2.8 tons. The L-23F, derived from the Queen Air, is bigger than the L-23D. The RL-23D is a specialized variant derived from the L-23D Seminole, built for spying. The RL-23D was redesignated as RU-8D in 1962, and the number of RU-8D planes built is approximately 40.

What are the specifications of the Beechcraft L-23 Seminole?

The specifications of the Beechcraft L-23 Seminole are given in the table below.

The Beechcraft L-23 Seminole is a cargo plane, and it has no armament; it is used to move goods, as a messenger, and for moving people. The L-23A/B Seminole has a length of 27 ft 7 in (8.41 m), wingspan about 38 ft 6 in to 38 ft 8 in (11.73 m to 11.79 m), and height of 8 ft 6 in (2.59 m). Its mass is 1,070.5 kg to 1,173.0 kg (2,360 lb to 2,586 lb), and its heaviest allowed weight for flying is 1,780.4 kg (3,925 lb). The engine is a Wright R182087, and the fastest speed is 231 nautical miles per hour, while cruising is 174 knots. It seats 5 people.

The L-23D Seminole has a wingspan of 45 ft 3 in (13.79 m), length of 31 ft 6.5 in (9.61 m), and height of 11 ft 4 in (3.45 m). Its empty weight is 4,970 lb (2,254 kg), and maximum takeoff weight is 7,300 lb (3,311 kg), or gross weight 7,400 lb (3,357 kg). The engines are two Lycoming GO-435-C2 reciprocating engines, each 260 horsepower. Maximum speed is 233 mph (375 km/h), cruising speed is 180 mph (290 km/h). Range is 1350 to 1470 miles (2172.6 to 2365.7 km), and service ceiling is 27,000 ft or 26,300 ft (8229.6 m or 8016.2 m). It has crew 1 and 7 passengers.

The L-23F, which is like the Queen Air based Seminole, has length of 10.82 m (35 ft 6 in), and gas tank size of 681.37 L (180 gal). It seats six. Its engines are Lycoming IGSO-480, each 254 kW (340 hp), and maximum cruising speed is 344 km/h (214 mph), service ceiling 8,230 meters (27,000 feet), and range of 2,325 kilometers (1,445 statute miles). The latest generation Seminole is a heavy-piston, twin-engine with a maximum gross weight of 3,342 kilograms (increased later to 3,493 kilograms) and wingspan of 13.98 meters.

The RL23D/RU8D, with bigger wing ends, has a wingspan of 13.79 m (45 ft 3 in), length of 9.61 m (31 ft 6.5 in), and height of 3.45 m (11 ft 4 in). It is run by a pair of Lycoming 340 horsepower forced air GSO-480-B1B6 motors, and has a belly mounted radar. Its cruise speed is 180 mph (289.68 km/h), and range is 13.5 to 14.7 hundred miles (2172.6 to 2365.7 km).

What is the performance of the Beechcraft L-23 Seminole?

The performance of the Beechcraft L-23 Seminole is given in the table below.

The L23D has a top speed of 233 miles per hour (375 kilometers per hour). The L23 Seminole has a normal flying speed of 160 nautical miles per hour. The L23 Seminole gets efficient performance at low fuel use flying mode - about 290 to 322 kilometers per hour speed (180 to 200 miles per hour). The L23D has a service ceiling of 19,000 feet (5,791 meters), range of 1,350 miles (2,173 kilometers), and rate of climb of 500 feet per minute (152 meters per minute).

L23F has a maximum cruising speed of 214 mph (344 km/h), a service ceiling of 27,000 feet (8,230 meters) and a range of 1,445 statute miles (2,326 kilometers). The RL23D/RU8D’s belly radar pod cuts top speed. Reduction of speed is around twenty to twenty-five miles per hour due to increased wind resistance.

What is the price for the Beechcraft L-23 Seminole?

The Beechcraft L23 Seminole has a price range of $60,000 to $200,000. Provenance, model variant, and condition drive the range. Price varies based on lifespan and extra parts put in. Better engines put the aircraft in the upper price tier. A premium Beechcraft L23 Seminole costs $250,000 to $500,000 due to upgraded engines and avionics. Ongoing expenses go from $3,000 to $10,000 annually, with exams for $500 to $1,500, upkeep for $500 to $2,000, and hangar costs of $1,200 to $5,000.