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Hi, Any performance specialists? I'm interested to understand the takeoff performance differences in the J model. Apart form some aerodynamic improvements the sizeable disparity between the attached 1977 and 1996 issued POH in takeoff performance I attribute to A) regulator imposing increased factoring / buffer inbuilt as time went on and/or the 'speed at 50ft'. I note the stall speeds in both books listed as 57kt in takeoff config (Flap 15 deg), yet the speed at 50ft in the 1977 book only 71kts and in the 1996 book 76kts . The lower margin above stall speed will achieve better numbers for takeoff distance I understand but I'm not certain its the only factor at play here in the differences. 71 kts is 24.56% margin above stall and 76 kts is 33.33% margin above 1G stall. Takeoff Safety speed for light aircraft I believe has to be at least 20 percent above stall speed?? Was there an FAA change at some stage on this? Are the 1977 figures allowed to be used... certainly not providing as much margin as later book data in the real world.
