Ki-61-II – Currently at Battle Rating IV
Loaded Weight: 3825kg
Engine: Ha-140 (1500HP)
Wing Area: 20.00m2
Max Speed:
525kph at SL (100%) , 544kph (WEP)
598kph at 5000m (100%) , 625-632kph (WEP)
Time to 5000m: 6:30 (100%) [12.82m/s]
Turn Time: 19 sec (WEP, sustained)
Bombload: 2x 100kg (2x 220lb)
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P-51D – Which is a US Battle Rating III Fighter
Loaded Weight: 4643kg
Engine: Packard V-1650-7 (1630HP)
Max Speed:
579kph at SL (100%) , 596kph (WEP)
???kph at 7450m , 707kph (WEP)
Time to 6000m: 7:16 (100%) [13.76m/s]
Turn Time: 22 sec (WEP)
Bombload: 2x 227kg bombs (2x 500lb)
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Conclusion…
P-51D has both climb rate advantage (by 7.3%) and speed advantage (by 52kph at low alts)
It also carries much more powerful payload for CAS role. The only distinct advantage Ki-61-II Kai is the turn time. However this doesnt explain why P-51D is BR III and Ki-61-II is BR IV (which is basically BR V with current Japan matchmaker)
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Proposal for new Battle Rating IV Fighter
Ki-100-I
Loaded Weight: 3495kg
Engine: Ha-112-II (1500HP)
Wing Area: 20.00m2
Max Speed:
485kph at Sea Level (100%) , 514kph (WEP)
580kph at 6000m (100%) , ~602kph (WEP)
Time to 5000m: 6:00 (100%) [13.88m/s]
Turn Time: 17 Sec (WEP)
Bombload: 2x 250kg (2x 550lb)
Ki-100-I is Ki-61-II but with a radial engine which has the same power as the inline one, 1500HP. The switch to the radial engine caused the plane to be 330kg lighter which improves its rate of climb by 8.3% which is more important than 30kph higher top speed (due to radial engine having more drag than the inline engine) because that’s 8.3% more energy instead of bit higher top speed. The reduced weight reduces stall speed giving it better control and improved turn time compared to Ki-61-II making it overall a superior fighter. Now to make it a truly Battle Rating IV fighter, it should get 2x 250kg bomb load. Technically Ki-61-II can also carry 2x 250kg bombs (instead of 2x 100kg) but at Rank III, Ki-61-II can retain the 100kg bombs.