Why still no dive acceleration difference?

[BlackBerry]

http://en.wikipedia.org/wiki/Pratt_%...00_Double_Wasp

R-2800-59 - 2,300 hp (1,700 kW)





2300HP ---345mph@SL


Specifications (P-47D Thunderbolt)

General characteristics
Crew: 1
Length: 36 ft 1 in (11.00 m)
Wingspan: 40 ft 9 in (12.42 m)
Height: 14 ft 8 in (4.47 m)
Wing area: 300 ft² (27.87 m²)
Empty weight: 10,000 lb (4,536 kg)
Loaded weight: 17,500 lb (7,938 kg)

Specifications (Fw 190 A-8 )

Data from Fw 190 A 8
General characteristics
Crew: 1
Length: 9.00 m (29 ft 5 in)
Wingspan: 10.51 m (34 ft 5 in)
Height: 3.95 m (12 ft 12 in)
Wing area: 18.30 m² (196.99 ft²)
Empty weight: 3,200 kg (7,060 lb)
Loaded weight: 4,417 kg (9,735 lb)