😎

What if Kestrels were fitted instead of Peregrines, the Peregrine was a development of the Kestrel IIRC.

Cheers

Cees

Peregrine

General characteristics
 Type: 12-cylinder supercharged liquid-cooled 60 degree Vee aircraft piston engine
 Bore: 5 inches (127 mm)
 Stroke: 5.5 inches (140 mm)
 Displacement: 1,295.9 in³ (21.24 L)
 Length: 73.6 in (1869 mm)
 Width: 27.1 in (688 mm)
 Height: 41.0 in (1041 mm)
 Dry weight: 1,140 lb (517 kg)
Components
 Valvetrain: Overhead camshaft
 Supercharger: Gear-driven centrifugal type supercharger, single speed, +9 psi boost
 Fuel system: Downdraught carburettor
 Fuel type: Petrol
 Cooling system: Liquid cooled, 70% water/30% Ethylene glycol
Performance
 Power output: 885 hp (660 kW) at 3,000 rpm, +9 psi boost (bmep = 180.3psi)
 Specific power: 0.68 hp/in³ (31.1 kW/L)
 Compression ratio: 6:1
 Power-to-weight ratio: 0.77 lb/hp

Kestrel

General characteristics
 Type: Supercharged liquid-cooled 60-degree V12 engine
 Bore: 5 in (127 mm)
 Stroke: 5.51 in (140 mm)
 Displacement: 1,297 in³ (21.25 L)
 Width: 24.41 in (620 mm)
 Height: 35.63 in (905 mm)
 Dry weight: 957 lb (434 kg)
Components
 Valvetrain: Two inlet and two exhaust poppet valves per cylinder
 Supercharger: Gear-driven centrifugal type supercharger
 Fuel system: Rolls-Royce carburetor
 Fuel type: 87 octane rating gasoline
 Cooling system: Liquid-cooled, pressurised to 300°F (150°C)
 Reduction gear: Spur, 0.553:1
Performance
 Power output:
 685 hp (511 kW) at 2,240 rpm for takeoff
 631 hp (471 kW) at 2,900 rpm at 14,400 ft (4,400 m)
 Specific power: 0.53 hp/in³ (24.05 kW/l)
 Compression ratio: 6.0:1
 Oil consumption: 0.18-0.35 oz/(hp•h) (7-13 g/(kW•h))
 Power-to-weight ratio: 0.72 hp/lb (1.18 kW/kg)

I’ve seen somewhere that the Kestrel could/had produced 1050hp at one point… :confused:

Can anyone confirm that?

Hi

My favourite stock answer to the many whirlwind / merlin engine debates.

Following extract not from a ‘ what if ‘,
but from genuine preserved correspondence…

Jan 41 in a letter to Sholto Douglas
by Eric Mensforth M.D. Westlands.

……. We are now able, because of the solution of certain undercarriage retraction problems, to offer to install in the whirlwind twin merlin XX engines …..

Therefore in answer to all the long standing internet debates, Westlands in 1941, put in writing that the whirlwind airframe could handle merlin engines..

Cheers
Jerry

Hi Jerry

Hmmm, well he might have written about fitting Merlins, but when I asked Fred Ballam about this, he told me he had never found anything on paper as to how exactly it was to be done… 🙁

Idea’s anyone…

NiallC… I think I Love you! Well, nearly… 😉

Thank you NiallC, thats another piece of the puzzle to making this Whirlwind model perfect… 😉

Check your PM’s as I’ll be sending you a little something for your trouble.

Again, thank you… 😉

Rocketeer… 🙂 Any chance you could post a photo of the colour? It would be very, helpfull to the project if you could…