Beechcraft Debonair (33, original)

Beech introduced the Model 33 Debonair in 1960 as the straight-tail entry-level Bonanza. The original Debonair used the Continental IO-470-K at 225 hp, retractable gear, and a simplified interior compared to the V-tail Bonanza of the same era. Beech positioned the Debonair as the budget-friendly Bonanza for buyers who wanted retractable-gear performance without the V-tail's distinctive design and higher cost.

Production ran from 1960 to 1967 with model letter iterations: 33, A33, B33, C33. Beech renamed the line to Bonanza 33 starting in 1968 with the introduction of the C33A. The Debonair name was retired but the airplane lineage continued through the E33, F33, and F33A variants. The Debonair / Bonanza 33 family ran continuously from 1960 to 1995, making it one of the longest-produced GA airframes.

The Debonair fleet that survives in 2026 has been heavily modified over the decades. Most have engine conversions to IO-520 or IO-550 power. Many have modern Garmin panels. Some have interior upgrades that bring them closer to later Bonanza F33A or G36 trim levels. American Bonanza Society covers Debonair ownership with the same depth of resources as later Bonanzas.

The Debonair with original IO-470-K cruises at about 162 KTAS at 75% power, burning 13 gph of 100LL. At long-range cruise (65%), the airplane drops to about 150 KTAS on 11 gph. Performance is meaningfully slower than later F33A or G36 Bonanzas due to the smaller engine. IO-520 or IO-550 STC conversions bring the Debonair's performance into F33A territory.

Useful load on a Debonair is about 1,000 to 1,100 pounds. Full fuel (50 gallons usable in early production, more in late) leaves about 600 to 700 pounds for people and bags. The Debonair's interior is simpler than later Bonanzas but cabin dimensions are similar. Range with reserves is about 750 nm at long-range cruise.

The Continental IO-470-K is the original engine on every Debonair. Six-cylinder, horizontally opposed, fuel-injected, direct-drive piston rated at 225 hp at 2,600 RPM. Continental's published TBO is 1,500 hours (1,700 hours for serial number 1006000 and later) per Continental Service Information Letter SIL 98-9E. The IO-470 family has decades of fleet history.

Field overhauls at Western Skyways, Gann Aviation, or other reputable Continental shops run $40,000 to $55,000 in 2026 prices for the IO-470-K. IO-520 or IO-550 STC conversions add $20,000 to $40,000 over a straight IO-470 overhaul but deliver significant performance and reliability improvements. Many Debonairs have completed STC conversion in recent years.

Oil consumption on a healthy IO-470-K runs about 0.3 to 0.5 quarts per hour. The engine reaches TBO routinely when operated regularly. Cylinder work at 900 to 1,200 hours common on hard-flown engines. The two-blade or three-blade constant-speed propeller requires overhaul concurrent with the engine.

Plan on $200 to $280 per flight hour at 100 hours a year of utilization, all-in. The Debonair's operating cost reflects the IO-470-K engine and the older airframe. Fuel and oil run about $75 to $93 per hour at 13 gph and $5.50 to $7 for 100LL. Engine overhaul reserve is $27 to $37 per hour based on the shorter IO-470-K TBO. STC-converted aircraft amortize engine reserve at lower per-hour rates due to longer IO-520 or IO-550 TBO.

Annual fixed costs (hangar, insurance, annual inspection) add another $55 to $100 per hour at 100 hours a year of utilization. Insurance on the Debonair is moderate. First-time Bonanza owners pay $3,000 to $5,500 a year typically. Established Beech pilots pay $2,000 to $4,000.

Acquisition cost in mid-2026: A Debonair with mid-time original IO-470-K engine runs $65,000 to $100,000. A Debonair with IO-520 or IO-550 STC conversion and modern Garmin panel runs $110,000 to $145,000. Aircraft with documented engine and gear-system rebuilds in recent years trade at premiums.

American Bonanza Society covers Debonair ownership. Annual dues run about $80. ABS provides type-specific pre-buy guidance including STC conversion economics and the older airframe inspection items.