The Yak-9D, introduced inside of the summer of 1943, any longer-range escort fighter version carrying additional fuel by 50 % outer wing panel tanks and an optional tank under the cockpit. (Soviet pilots must have viewed the latter as a mixed blessing.) The Yak-9D was powered with a 1,360 hp. M-105PF-3 engine. Specifications Taipei stress relief club for the Yak-9D are the following (from Full lowdown Book of Fighters by Roy Cross): Max speed 374 mph at 10,170 ft., 332 mph cruising level