![]() But it was later discovered that this ballast was insufficient and it was decided to change the four-blade propeller for a lighter three-blade one (from a P-39Q). To modify the centre of gravity position, ballast was installed in the rear fuselage. The main undercarriage was not retractable but the nose wheel was still retractable. ![]() The main modification consisted of mounting P-63E-like outer wing panels with 35 degrees sweep-back. To do so, two P-63 airframes were diverted for modification: one was an XP-63N with 379 hours of flight time and received the model designation L-39-1 the other was a P-63A-9-BE and received the model designation L-39-2. This announcement marked the first stage development of the US Navy research swept-back wing experimental programme. On 17 May, 1946, Bell Aircraft announced that 'experimentation with the use of sweptback wings in an effort to reach the ultimate goal of man-carrying flight beyond the speeds of sound has passed from the high-speed wind-tunnel stage to the use of full-scale aircraft'. Please sign in to view your online orders and in-store purchases, create and save multiple project lists, and sign up or manage email subscriptions from Aircraft Spruce. Thanks to its spacious cockpit with great view and its easy handling, it is an ideal aircraft for a jet flight. The Aero L-39 “Albatros” was designed by Aero Vodochody in the former Czechoslovakia (CSSR) to meet the Soviet Air Force’s needs of a lightweight, cost-effective and manoeuvrable training aircraft.
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