a prototype intelligence-gathering drone version of the Bonanza 36, six built YAU-22A (Model PD.249) Prototype low-cost close-support version using Bonanza A36 fuselage and Baron B55 wings, one built QU-22B Production drone model for the USAF operation Pave Eagle, 27 built, modified with turbocharging, three-bladed propeller, and tip-tanks Modifications Allison Turbine Bonanza Allison, in conjunction with Soloy Aviation Solutions, certified a conversion of Beech A36 Bonanza aircraft to be powered by an Allison 250-B17C turboprop engine. Continental Voyager Bonanza (A36) Standard aircraft with a liquid-cooled Continental Motors TSIOL-550-B engine. Propjet Bonanza (A36) standard aircraft modified by Tradewind Turbines with an Allison 250-B17F/2 turboprop engine (Original STC # 3523NM by Soloy). TurbineAir Bonanza (B36TC) Modification by Rocket Engineering subsidiary West Pacific Air, LLC with a 500 hp Pratt & Whitney PT6A-21 turboprop engine and fuel capacity. Whirlwind System II Turbonormalized Bonanza (36, A36, G36) standard aircraft modified by Tornado Alley Turbo with a Tornado Alley Turbonormalizing (keeps power up to 20,000ft) system and approved for a 4000 lb MTOW Whirlwind TCP Bonanza (A36TC or B36TC) standard aircraft modified by Tornado Alley Turbo with a TCM IO-550B engine and Tornado Alley Turbonormalizing system, this airframe is approved for a 4042 lb MTOW. Bay Super V A multi-engine conversion of the C35 Bonanza. Model 40 The Beechcraft Model 40A was an experimental twin-engined aircraft based on the Bonanza. Only one prototype was built in 1948. It featured a unique over/under arrangement of two 180-hp Franklin engines mounted on top of each other and driving a single propeller. The plane had a different engine cowl from a standard Bonanza, and the nose gear could not fully retract, but otherwise it greatly resembled the production Bonanzas of the time. Certification rules demanded a firewall be fitted between the two engines, however, thus stopping development. The status of the prototype is unknown. Parastu 14 This is the standard F33 (1970) variant of the Bonanza which has been reverse engineered by Defense Industries Organization of Iran and is being manufactured without a license. Operators Civil The Bonanza is popular with air charter companies, and is operated by private individuals and companies. In 1949, Turner Airlines (later renamed Lake Central Airlines) commenced operations using three V-tail Bonanzas. That same year, Central Airlines began operations using eight Bonanzas, later adding three more to the fleet before starting to phase them out in 1950 in favor of the Douglas DC-3. Military