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[Data Sheet] Curtiss Hawk H-75O

Model: Curtiss Hawk H-75O
 
Technical Description: Single-engine single-engine fixed-train and metal construction

 

Visual Aspects: 

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Short History: Hawk were acquired by the Directorate General of Aeronautics in 1938 as a replacement for the D-21 Dewoitine. It buys a lot of 30 units, arriving in the country by the end of that year. In turn, it acquires the license to manufacture 20 additional units in the Military Factory of Aviation of Cordoba.
 
The Hawks were called H-75O, they differed from the models sold to other countries for having fixed landing gear, Wright Cyclone GR-1820 radial engine of 1,000 hp and for having a Telefunken radio.
 
The first specimen manufactured in the country made its inaugural flight on 16/8/1940, commanded by the Tte. First Correa, being delivered to military aeronautics on 1/9/1940
 
All units were assigned to Air Regiment No. 2, depending on the Army Aviation Command, in July 1944 the active machines were re-registered, placing the letter C in front of the aircraft number. In 1951 they were integrated within Group 1 of hunting and in 1952 they happened to the VII Air Brigade of Morón
 
The Hawk began to be discharged in 1949 with the arrival of the Gloster Meteor. The surviving units were deprogrammed in 1955 at which time they were assigned at Jorge Newbery Airport during the "Liberating Revolution" that overthrew the government of Juan Perón.

 

Configuration: Fighter

 

Production Status

First flight: August 16th 1940
Introduction year:  1951

Status: Retired

Number built: 20 and 30 bought

 

 

Crew Data
Number of crew: 1
Roles of crew: Pilot
 
Engine Data (Piston Aircraft)
Manufacturer: Wright
Name: Cyclone R-1820-G5
Number of engines: 1
Number of cylinders: 9

Configuration: Star

Cooling: Air-Cooled
Supercharger / Turbo: two-speed supercharger
Fuel: 80 octane
Dry weight:
Gear ratio:

 

Engine limitations

     Cylinder Head Temperature

            Minimum for takeoff: 121 C

             Maximum for takeoff: 260 C

             Maximum for rated power

                        Climb and level flight: 205 C

                         Maximum for Cruising: 205 C

                         Maximum Ground run: 252 C     

         Oil temperature

                Minimum for takeoff: 50 C

                Maximum in flight: 85 C

                 Desired in flight: 60 C

          Maximum R.P.M.

                    Takeoff: 2200

                     Dive (momentarily): 2520


Power Data
WEP: 1000 Hp 5  min
Take Off Power:  1,000 hp at 2,200 rpm
Maximum Power: 2,100 rpm was 850 hp at S.L

Normal maximum rating in first supercharger gear: 850 hp at 2,100 rpm and 6,000 feet

High supercharger gear: 750 hp at 15,200 feet
Cruising Power:


Fuel Data
Fuel: 833L of 80 octane
Fuel consumption:
  
Propellor Data

Manufacturer: Curtiss
Type:

Material: Metal
Number of blades: 3
Blade diameter: 
 
Basic Geometric Data
Length: 8.71m
Wing span: 11.38m
Wing area: 21.92m2
Height: 2.82m
Flap area:
Elevator area: 1.78 m2
Rudder area: 1.27 m2
Aileron area: 1,71 m2

Fin area:  0.65 m2

Stabilizer Area: 2.67 m2
 
Weight Data
Empty weight: 1942kg
Loaded weight: 2803kg
 
General Performance Data
Maximum speed: 488km/h

Minimum speed:

Landing speed: 190km/h
Cruising speed: 386km/h
Service ceiling: 10150m/9700m
Range: Normal: 1090km

With external fuel: 1253km
 
Max Speed Chart
451km/h at 3.050 meters
488km/h at 5.970 meters
 
Rate of Climb
1 min 30 sec to 1.000 meters
12 min 8 sec to 7000m
 
Armament

1 machine gun Madsen 11.35 mm And 3 Madsen machine guns of 7.65 mm. Up to 10 bombs of 30 lb in the alar position.

 

 

One test flight was made with 100g bombs but that is it

 

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In the image, the Curtiss bonnet with the assembly of the machine guns synchronized with the rotation of the propeller.

 

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In the image the wing of the Curtiss with the machine gun Mounted. In position 1 the box containing the ammunition 11.35 mm gauge. In the 2, the cable for the actuation of The crank.

 

This photograph I incorporate before the fact to verify that the airplanes not only had in their Machine guns with infantry caliber, in this case the 7.65 x 54 Mauser. On Basis of the document delivery note I no. 125, dated at El Palomar on 4 September 1945, where the General Directorate of Aeronautical Material transfers the machine gun Madsen de Ala n ° 20646, this ends up clarifying the initial doubt regarding what is Stated in the purchase sheet of the aircraft. There were 11.35 mm machine guns Mounted on the bonnet and on the wing of the Curtiss.

 

 

Info About the 11.35mm Madsen

 

 

Overall Length 1280 mm

 

Width 120 mm

 

Length of canon 750 mm

 

Number of apertures 6

 

Depth of grooves 0.225 mm

 

Width of the stripes 3,5 mm

 

Retraction 80 kg

 

Weight of the weapon 10,5 Kg

 

Weight of 100 cartridges 4.8 kg

 

Weight of 100 links 0.6 Kg

 

Fire rate 900 to 1050 shots / minute

 

 

 

Ammunition:
 

With respect to the ballistic characteristics, the speed values were established Initial for a series of ten shots with the Madsen machine gun (750mm tube length), placing the screens within 50 meters of the gun's mouth. The expected values of the average of the series were of 825 m / sec with a tolerance of 10 m / sec in more and in less. In the case of pressure, the Crusher method was used, in this case, a series of five shots. Expecting an average not exceeding 2 700 kg / cm² with individual values that do not exceed 2 850 kg / cm².
 

From a series of ten shots and by placing a steel plate of 10 mm Thick, with a Brinel hardness of not less than 450 points, used as target at 91.4 meters (100 yards), at least eight projectiles were expected to pass through.

 

 

 

Notes
 

There is a lot of information about the 11,35mm on source 3
 
Sources
 
1. Fuerza Aerea Argentina N 5 Curtiss Hawk

2.  FÁBRICA MILITAR DE AVIONES: CRÓNICAS Y TESTIMONIOS

3. Un Viejo Guerrero el 11.35 Original - CEsBa ROSARIO

4. Finnish Aces of WWII by Kari Stenman https://www.warbirdsforum.com/topic/6078-brewster-f2a-performance/

5.Jane's All the World's Aircraft, 1945/46. Sampson, Low & Marston Co., London, 1946, p.315 http://www.warbirdforum.com/cw212.htm

6.https://ww2aircraft.net/forum/threads/h75a-flight-manual.23226/ H75A Flight Manual

7. Curtiss 75-A manual https://ww2aircraft.net/forum/threads/curtiss-75a-manual-upload.30568/

8. Brewster Buffalo with Cyclone Gr1820 engine https://ww2aircraft.net/forum/threads/brewster-buffalo-with-cyclone-gr1820-engine.9115/

 

 

 

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Edited by mpata10
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38 minutes ago, blockhaj said:

Ive never heard of the madsen 11 mm outside of the argentinian hawk.

The Ae.M.B 1 and 2 had the madsen of 11mm as a front gun, but yeah it is a really rare gun

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I would like to add.........Hawk 75Os also carried bombs:

 

Quote

Argentina bought a number of the simplified, fixed landing gear Hawk 75Os, (intended for rough-field operations and ease of maintenance) and purchased a manufacturing license for the type; 30 were built and delivered by Curtiss, and 20 produced locally. These aircraft used the same engine, Wright Cyclone R-1820-G5 as the Martin 139WAA's and Northrop 8A-2s used by the Argentine Army Aviation at the time. Usually armed with one 11.35 mm (0.45 in) Madsen machine gun and three 7.65 mm (0.30 in) Madsen light machine guns, there was provision for up to ten 30 lb (14 kg) bombs on underwing pylons. The last Argentinian Hawks remained in service until November 1954.

https://www.asisbiz.com/il2/P-36/Hawk-75A.html

 

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Hope this helps! :wink:

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On 21/11/2018 at 17:17, Results45 said:

I would like to add.........Hawk 75Os also carried bombs:

 

https://www.asisbiz.com/il2/P-36/Hawk-75A.html

 

0K7DaRC.png?1

 

Bqip52d.png

 

8NCTQ1b.png

 

 

Hope this helps! :wink:

Yeah it carried bombs, but the bomb load that the FAA gave this plane is pretty useless in war thunder, soooo probably it won't be added.

I briefly mention it but thanks for the feedback

On 13/02/2017 at 19:34, mpata10 said:


Armament

1 machine gun Madsen 11.35 mm And 3 Madsen machine guns of 7.65 mm. Up to 10 bombs of 30 lb in the alar position.

 

1

 

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On 30/11/2018 at 18:40, mpata10 said:

Yeah it carried bombs, but the bomb load that the FAA gave this plane is pretty useless in war thunder, soooo probably it won't be added.

I briefly mention it but thanks for the feedback

 

 

Well any bombload -- even 250-300lbs -- is useful against tanks at Tier 1, not to mention that even at Tier 3 P-63s carry one 250 or 500-pound bomb. :wink:

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