First, a front-line fighter from Polikarpov. Though similar in size to the I-34, it is substantially redesigned, using an inline engine. Due to its mission, it is designed to operate from austere bases.

Polikarpov I-37 all-metal monoplane fighter with enclosed cockpit and retractable landing gear

Wingspan - 8.8m; Length - 7.3m; Height - 3.0m; Wing Area - 14.4m2

Crew - 1; Engines - 1x 1,000HP Klimov in-line engine; Empty weight - 1,580kg; Maximum weight - 1,815kg

Armament - 2x 7.62mm ShTAS, 1 20mm ShVAK

Top speed - 360kts; Maximum altitude - 13,500m;

Maximum range - 470nm

Combat radius - 180nm

Revised to incorporate discussion below.

Il-2 all-metal monoplane torpedo bomber with retractable landing gear

Length - 9.10m; Wingspan - 11.6m; Height - 4.0m; Wing Area - 38.6m2

Crew - 2; Engines - 1x 1,300HP Mikulin M-35 in-line engine;

Empty weight - 4,145kg; Maximum weight - 6,125kg

Armament - 1x 14mm MG in spinner, 1x 14mm MG dorsal

Top speed - 220kts; Maximum altitude - 8,500m;

Maximum range - 1,100nm

Combat radius - 400nm

An important feature is that the crew and engine have the protection of a 12mm armored bathtub, protecting them from shrapnel and most machinegun fire.

Polikarpov I-37 all-metal monoplane fighter with enclosed cockpit and retractable landing gear

Wingspan - 8.8m; Length - 7.3m; Height - 3.0m; Wing Area - 14.4m2

Crew - 1; Engines - 1x 1,000HP Klimov in-line engine; Empty weight - 1,580kg; Maximum weight - 1,815kg

Armament - 2x 7.62mm ShTAS, 1 20mm ShVAK

Top speed - 360kts; Maximum altitude - 13,500m;

Maximum range - 470nm

Combat radius - 180nm

Revised to incorporate discussion below.

Il-2 all-metal monoplane torpedo bomber with retractable landing gear

Length - 9.10m; Wingspan - 11.6m; Height - 4.0m; Wing Area - 38.6m2

Crew - 2; Engines - 1x 1,300HP Mikulin M-35 in-line engine;

Empty weight - 4,145kg; Maximum weight - 6,125kg

Armament - 1x 14mm MG in spinner, 1x 14mm MG dorsal

Top speed - 220kts; Maximum altitude - 8,500m;

Maximum range - 1,100nm

Combat radius - 400nm

An important feature is that the crew and engine have the protection of a 12mm armored bathtub, protecting them from shrapnel and most machinegun fire.

This post has been edited 6 times, last edit by "AdmKuznetsov" (Aug 20th 2008, 2:19am)

That should give an idea.

It's light, so producing large numbers of 'em won't use up too much aluminum.

(I figure the RF produces around 40,000 tons/year, growing to ~55,000 tons/yr by 1939. Soviet production in 1939 was 60,000 tons)

It's light, so producing large numbers of 'em won't use up too much aluminum.

(I figure the RF produces around 40,000 tons/year, growing to ~55,000 tons/yr by 1939. Soviet production in 1939 was 60,000 tons)

This post has been edited 1 times, last edit by "AdmKuznetsov" (Aug 17th 2008, 7:24am)

## Quoted

Originally posted by AdmKuznetsov

That should give an idea.

It's light, so producing large numbers of 'em won't use up too much aluminum.

(I figure the RF produces around 40,000 tons/year, growing to ~55,000 tons/yr by 1939. Soviet production in 1939 was 60,000 tons)

So something like the I-17?

Compared to the CR.36 which is very marginal for weight with a lot shaved off, the I-37 is larger and draggier but somehow weighs considerably less and has considerably greater performance. Planebuilder can give some strange results.

With regards to construction - Russia has lots and lots of wood that is cheap and equally good as aluminium for most things.

The Il-2 is like the historical Il-2 but a bit smaller for some reason. 12mm armour around the entire cockpit instead of just the pilot (and it wasn't that thick on the Il-2) would put the weight up considerably.

I-37

General Type:

Airplane = 1

Airship = 2

Orbiter = 3

1

Year of First Flight: 1936.5

Description

Carrier or Rough Field

Monoplane with Struts

Conventional Fuselage

Single-engine Front-Line Fighter by Polikarpov

Characteristics:

Weight (maximum) 4,507 lbs

Weight (empty) 3,770 lbs Length 24.5 ft

Wingspan 30 ft

Wing Area 164 sq ft

Sweep 5 degrees

Engines 1

Klimov M-105 in-line Piston 1,100 hp at 16,000 ft

Crew 1

Typical cost $0.026 million in 1938

Total number procured 1000

Performance:

Top Speed 378 kts = 435 mph

at 16,000 ftOperational Ceiling 44,700 ft

Range 700 nm = 806 miles

with 58 lbs payload

61 lbs released at halfway point

Climb 4,315 fpm

Cruise 300 kts = 345 mph

at 37,000 ft

Corner Speed 226 KIAS =

242 kts at 5,000 ft

Mach N/A

Turning Rate 30.0 deg/sec

Radius 1,565 ft

Internal Data:

Intake / Fan Diameter 16.5 ft

Bypass Ratio 196

Engine Weight 1307 lbs

Overall Efficiency 22.75 percent

Structural Factor 1.00

Number of Wings 1.01

Number of Fuselages 1

Limiting Airspeed 470 kts

Wing Ultimate g Load 10.00 g

Wing Taper 0.3

Wing Thickness at Root 1 ft

Tail / Canard Factor 0.37

Number of Nacelles 0

Length 6 ft

Diameter 3 ft

Fullness 0.4

Fuselage Diameter 2.5 ft

Fuselage Fullness 0.3

Pressurized Volume 0 percent

Cargo Decks 0

Cleanness 87 percent

Unstreamlined section 1.33 sq ft

User equipment 413 lbs

General Type:

Airplane = 1

Airship = 2

Orbiter = 3

1

Year of First Flight: 1936.5

Description

Carrier or Rough Field

Monoplane with Struts

Conventional Fuselage

Single-engine Front-Line Fighter by Polikarpov

Characteristics:

Weight (maximum) 4,507 lbs

Weight (empty) 3,770 lbs Length 24.5 ft

Wingspan 30 ft

Wing Area 164 sq ft

Sweep 5 degrees

Engines 1

Klimov M-105 in-line Piston 1,100 hp at 16,000 ft

Crew 1

Typical cost $0.026 million in 1938

Total number procured 1000

Performance:

Top Speed 378 kts = 435 mph

at 16,000 ftOperational Ceiling 44,700 ft

Range 700 nm = 806 miles

with 58 lbs payload

61 lbs released at halfway point

Climb 4,315 fpm

Cruise 300 kts = 345 mph

at 37,000 ft

Corner Speed 226 KIAS =

242 kts at 5,000 ft

Mach N/A

Turning Rate 30.0 deg/sec

Radius 1,565 ft

Internal Data:

Intake / Fan Diameter 16.5 ft

Bypass Ratio 196

Engine Weight 1307 lbs

Overall Efficiency 22.75 percent

Structural Factor 1.00

Number of Wings 1.01

Number of Fuselages 1

Limiting Airspeed 470 kts

Wing Ultimate g Load 10.00 g

Wing Taper 0.3

Wing Thickness at Root 1 ft

Tail / Canard Factor 0.37

Number of Nacelles 0

Length 6 ft

Diameter 3 ft

Fullness 0.4

Fuselage Diameter 2.5 ft

Fuselage Fullness 0.3

Pressurized Volume 0 percent

Cargo Decks 0

Cleanness 87 percent

Unstreamlined section 1.33 sq ft

User equipment 413 lbs

I-37

General Type:

Airplane = 1

Airship = 2

Orbiter = 3

1

Year of First Flight: 1936.5

Description

Carrier or Rough Field

Monoplane with Struts

Conventional Fuselage

Single-engine Front-Line Fighter by Polikarpov

Characteristics:

Weight (maximum) 4,507 lbs

Weight (empty) 3,770 lbs Length 24.5 ft

Wingspan 30 ft

Wing Area 164 sq ft

Sweep 5 degrees

Engines 1

Klimov M-105 in-line Piston 1,100 hp at 16,000 ft

Crew 1

Typical cost $0.026 million in 1938

Total number procured 1000

Performance:

Top Speed 378 kts = 435 mph

at 16,000 ft

Operational Ceiling 44,700 ft Range 700 nm = 806 miles

with 58 lbs payload

61 lbs released at halfway point

Climb 4,315 fpm

Cruise 300 kts = 345 mph

at 37,000 ft

Corner Speed 226 KIAS =

242 kts at 5,000 ft

Mach N/A

Turning Rate 30.0 deg/sec

Radius 1,565 ft

Internal Data: Intake / Fan Diameter 16.5 ft

Bypass Ratio 196

Engine Weight 1307 lbs

Overall Efficiency 22.75 percent

Structural Factor 1.00

Number of Wings 1.01

Number of Fuselages 1

Limiting Airspeed 470 kts

Wing Ultimate g Load 10.00 g

Wing Taper 0.3

Wing Thickness at Root 1 ft

Tail / Canard Factor 0.37

Number of Nacelles 0

Length 6 ft

Diameter 3 ft

Fullness 0.4

Fuselage Diameter 2.5 ft

Fuselage Fullness 0.3

Pressurized Volume 0 percent

Cargo Decks 0

Cleanness 87 percent

Unstreamlined section 1.33 sq ft

User equipment 413 lbs

General Type:

Airplane = 1

Airship = 2

Orbiter = 3

1

Year of First Flight: 1936.5

Description

Carrier or Rough Field

Monoplane with Struts

Conventional Fuselage

Single-engine Front-Line Fighter by Polikarpov

Characteristics:

Weight (maximum) 4,507 lbs

Weight (empty) 3,770 lbs Length 24.5 ft

Wingspan 30 ft

Wing Area 164 sq ft

Sweep 5 degrees

Engines 1

Klimov M-105 in-line Piston 1,100 hp at 16,000 ft

Crew 1

Typical cost $0.026 million in 1938

Total number procured 1000

Performance:

Top Speed 378 kts = 435 mph

at 16,000 ft

Operational Ceiling 44,700 ft Range 700 nm = 806 miles

with 58 lbs payload

61 lbs released at halfway point

Climb 4,315 fpm

Cruise 300 kts = 345 mph

at 37,000 ft

Corner Speed 226 KIAS =

242 kts at 5,000 ft

Mach N/A

Turning Rate 30.0 deg/sec

Radius 1,565 ft

Internal Data: Intake / Fan Diameter 16.5 ft

Bypass Ratio 196

Engine Weight 1307 lbs

Overall Efficiency 22.75 percent

Structural Factor 1.00

Number of Wings 1.01

Number of Fuselages 1

Limiting Airspeed 470 kts

Wing Ultimate g Load 10.00 g

Wing Taper 0.3

Wing Thickness at Root 1 ft

Tail / Canard Factor 0.37

Number of Nacelles 0

Length 6 ft

Diameter 3 ft

Fullness 0.4

Fuselage Diameter 2.5 ft

Fuselage Fullness 0.3

Pressurized Volume 0 percent

Cargo Decks 0

Cleanness 87 percent

Unstreamlined section 1.33 sq ft

User equipment 413 lbs

OK, I see 2 problems off the top:

1 - the prop diameter is insane: you've got a propeller that's bigger than a Thunderbolt's on this thing. For a engine in the 1100 hp range, you should be looking at a 8-10 foot prop.

2 - the fuselage diameter's too small. The Klimov itself is bigger than 2.5 feet across, as is the pilot. Most V-12s of this period and size are AT LEAST 3 feet across, and the pilot needs at least that much if not more like 3.5'. Kaiser Kirk was working me over on this front back a bit.

Something else that you can clean up: if it's a monoplane, you don't need the "monoplane with struts" it's showing now. That can be fixed by setting it to have 1 wing, not 1.01.

The armament weight looks a touch low as well (though it might be OK, haven't got Planebuilder on this Linux machine since it doesn't work with OpenOffice), and there's only barely enough payload to carry ammunition for the guns.

1 - the prop diameter is insane: you've got a propeller that's bigger than a Thunderbolt's on this thing. For a engine in the 1100 hp range, you should be looking at a 8-10 foot prop.

2 - the fuselage diameter's too small. The Klimov itself is bigger than 2.5 feet across, as is the pilot. Most V-12s of this period and size are AT LEAST 3 feet across, and the pilot needs at least that much if not more like 3.5'. Kaiser Kirk was working me over on this front back a bit.

Something else that you can clean up: if it's a monoplane, you don't need the "monoplane with struts" it's showing now. That can be fixed by setting it to have 1 wing, not 1.01.

The armament weight looks a touch low as well (though it might be OK, haven't got Planebuilder on this Linux machine since it doesn't work with OpenOffice), and there's only barely enough payload to carry ammunition for the guns.

This post has been edited 1 times, last edit by "Hrolf Hakonson" (Aug 18th 2008, 2:47am)

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