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Old 11-09-2018, 01:58 AM   #1
frodrigues2016
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Default Kfir jet

Hi to all...I tought that one of the best jets were the F-20 TigerShark but the Kfir in the US is named F-21 Kfir i would like to know if the F-21 is better than the F-20...thanks.
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Old 11-09-2018, 03:57 AM   #2
garrya
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Turn performance of F-5E vs Kfir at various altitude:

At 5000 ft
ITR (instataneous turn rate) of Kfir is 20.9 degrees/seconds, ITR of F-5E is around 20.1 degrees/second
STR (sustained turn rate) of Kfir is 11.9 degrees/second, STR of F-5E is around 12.9 degrees/second





At 15000 ft
ITR of Kfir is 16.8 degrees/seconds, ITR of F-5E is around 16.7 degrees/second
STR of Kfir is 8.7 degrees/second, STR of F-5E is around 10.1 degrees/second





At 25000 ft
ITR of Kfir is 13 degrees/seconds, ITR of F-5E is around 14 degrees/second
STR of Kfir is 6 degrees/second, STR of F-5E is around 7 degrees/second




In short, turning performer of Kfir is inferior to F-5E in most altitude.
That because the delta wing of Kfir has more gradual CL/alpha curve than the near straight wing of F-5E (and for extension F-20), at low altitude then Kfir can get higher ITR by going higher AoA (because delta wing have higher stall AoA), but at higher altitude, where air is thinner, you need to go faster to generate enough lift, it harder to turn at high AoA, therefore both ITR and STR of Kfir is inferior to F-5E at altitude greater than 15000 ft

Last edited by garrya; 11-09-2018 at 04:25 AM.
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Old 11-09-2018, 09:44 PM   #3
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Sure, the F-5 has superior turn performance, but note the listed combat thrust to weight ratios. All things being equal, the Kfir could probably beat the F-5 handily by taking advantage of its superior thrust to weight ratio.
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Old 11-09-2018, 10:21 PM   #4
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I think garrya was using the F-5 to stand in the for the F-20, which would also enjoy a TWR advantage over the F-5.
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