[Data Sheet] I.Ae 24 "Calquin"

[mpata10 92]

Model:   I.Ae 24

Technical Description:  This aircraft was known for being durable and having a decent armament but it had a bad reputation as being a deadly aircraft because it was slow for the time it was flown and it had a poor maneuverability

 

Visual Aspects:

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Short History:

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After the end of World War II Air Force Argentina ordered Instituto Aerotecnico (Cordoba) to develop a draft of a new high-speed light bomber. Without further ado, the designers took as a basis the legendary English bomber de Havilland Mosquito. The new aircraft, designated IAe.24 Calquin ( "Royal Eagle"), began to build in 1946 the factory Fabrica Militar de Aviones (FMA). He became the first twin-engine aircraft designed and built in Argentina. 

The prototype made its first flight June 5, 1946. Originally planned to equip the aircraft, as well as the Mosquito, engines Rolls-Royce Merlin (capacity of 1620 hp), but in the course of construction they were replaced by the American Pratt & Whitney R-1830-G "Twin Wasp" power of 1050 hp Unfortunately, the new engines are not able to meet the requirements of the military - speed of the aircraft was only 440 km / h.

Despite these shortcomings have been ordered series of 100 aircraft. The first of these was completed in June 1947. A production ended in 1950. Officially IAe.24 were withdrawn from the Air Force ended in 1957, although most of them continued to be used until 1961.

   This plane saw combat in in 4 times all during "Golpe de estado" against Juan Domingo Peron . Firstly on the bombardment of the Plaza de Mayo. Afterwards on September 17th a group of Calquis bombarded and shot the ships ARA Cervantes and ARA La Rioja. Lastly on September 18th a group of calquins attack a division of rebel infantry with support of Meteors Mk. IV. One Calquin was hit by a 40 mm Brofos AAA of the ARA King but it returned to the base in Moro.

      Even thought of its sturdiness the plane gain a really bad reputation because of being unstable in all axis and when the landing gear was deployed the plane gain a much higher stall speed making the pilots landing in high speeds, this was fix by opening the Landing gear when the runways started making the stall more controlable. 

 This plane was known as the "Hace Viudas" (Widow Maker) or "Nardo" (A flower of cemeteries) because 50 pilots lots their life flying this plane ( more or less 25 planes )

 

 

 

 

 

Characteristics

Spoiler

 

Production Status

First flight: 1946 [2, 4]
Introduction year: 1950 [2, 4]

Status: Serial production

Number built: 100 [2, 4]

 

Crew Data
Number of crew: 2 [2, 4]
Roles of crew: Pilot and navigator/bombardier [2, 4]

Engine Data (Piston Aircraft)   

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Manufacturer:  Pratt & Whitney 

Name: R-1830 "Twin wasp"

Model:                                                             R-1830-SC-G and SC3-G                          S1C-G  & S1C3-G             

Type:                                                                                14RA                                                            

                                                                                     3:2 and 16:9                                                    --

                                                                                   reduction gears                                                 --                                                  

Number of engines: 2 [2, 4] 
Number of cylinders: 14 [2, 3]

Configuration: Double star [2, 3]

Cooling: Air-cooled [1, 89]
Supercharger / Turbo:                                                    -                                                                -
Fuel:                                                                                                                87                                                           91/98                                           
Dry weight(lb):                                                            3:2-1438                                        Average: 1467

                                                                                        16:9-1450
Blower Gear ratio:                                                                                                                      7.15:1  

Propeller reduction Gear Ratio:                                                                            .5625 (16:9) Spline Coupled

Compression ratio:                                                               6.7:1                                                          --

 

 

 

Power Data (hp- rpm- in Hg- alt)

Rating                                                                              7.15:1                                                        --
WEP: -
Take Off Power(5 min):                                          1050-2700-42-S.L.                                        1200-2700-48-S.L

                                                                                                                                                  1200-2750-47-S.L.
Max continuous Power:

               At critical alt:                                            900-2550-34-12000                                       1050-2550-39.5-7500

                                                                                                                                                 1000-2700-37.5-10000

           Sea level press. alt :                                       900-2550-36-S.L.                                           1050-2550-41.5-S.L
Cruising Power: 650HP [2, 3]

 

 

Maximum permissible temperatures are as follows:

Cylinder Head:   500°F spark plug gasket

                                 475°F cylinder head well  

Cylinder Base: 335°F

Oil Inlet:  220°F single speed supercharger

                    212°F two-speed supercharger

Propellor Data
Manufacturer: Hamilton Standard Hydromatic [2, 3]
Type: 23-E50 or 23-B50[2, 3] [1, 90]
Number of blades: 3 [1, 90]

 

Basic Geometric Data
Length: 12m [2, 3]
Wing span: 16.30m [2, 3]

 

Wing area: 38.00 m2 [2, 3]
Height: 3.40 m [2, 3]

Weight Data
Empty weight: 5,340 kg [5]
Loaded weight: 7,200 kg [5]
 
General Performance Data
Maximum speed: 440 km/h [1, 91]

Minimum speed: 140 km/h with flaps, 125km/h with flaps [1, 91]

Landing speed: 125 km/h [5]
Cruising speed: 380 km/h [1, 91]
Service ceiling: 10,000 m [1, 91]
Range: 1200 km [1, 91]

Rate of Climb
12,5/s (for now only found) [2, 4]

1 minute to reach 750 m
 
Armament
Weaponry

Main weaponry: 4 12.7 ml Browning machineguns or Dl (nationally manufactured)  with short canon, or 4 20 ml canons Hispano Suiza 804 [1, 90] from source [4] it s know that it had a pneumatically loading system from the cabin

Bombs and Missiles: 750 kg in bombs and 12 75 mm missiles [2, 4]

Load outs[4]: -Bomber: 750 bullets and a known load out of 2 100kg and 4 50kg boms or 18 13/15 kg bombs group in six

                         -Attacker:  1170 bullets and 10 missiles of 75 mm and 11 kg

 

 Notes:

1. Models SC-G, SC3-G, and S3C4-G become models S1C-G, S1C3-G and S4C4-G or vice versa respectively, depending only open the octane rating of the fuel used and the ignition timing where applicable in which case the pertinent model designation and rating applies without changing the engine nameplate.

Sources (most of the sources found in spanish) 

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1. "Fabrica Militar de Aviones" Crónicas y Testimonios, by Angel Cesar Arreguez http://es.slideshare.net/ramoncopa/fabrica-militardeavionescronicasytestimonios-por-angel-cesar-arreguez 

2. Baldini, Atilio; Bontti, Sergio. I.Aé.- 24 CALQUIN, Buenos Aires, 2007. ISBN 978-987-20557-1-4. Revista Pista 18, Nº 6 1997, “El Mosquito que quiso ser Águila” Carlos Ay. Las Alas de Perón, Ricardo Burzaco. http://www.soldadosdigital.com/2010/pdf/militaria-mosquito.pdf

3.  IAé 24 Calquín, deAtilio Baldini y Sergio Bontti

4. “Algo más que un Intento” de Fernando de Benedetto

5. Alas de Perón

Source 6(English): FEDERAL AVIATION AGENCY http://www.aviationhistorycanada.ca/Content/type_certs/P&W R-1830-SC-G, SC3-G, S1C-G,S1C3-G,S3C4-G,S4C4-G (FAA).pdf

Source 7(English): Maintenance Manual Twin Wasp (R-1830) S1C3-G  http://www.avialogs.com/index.php/en/engines/usa/pratt-whitney/r-1830-twin-wasp/part-no-118610-maintenance-manual-twin-wasp-r-1830-s1c3-g-engines.html                   To download: https://www.dropbox.com/s/wtl4y9nq0cdofmg/P W R-1830 Twin Wasp Maintenance Manual.pdf?dl=0 

 

 

 

Edit #1: Added some story when this plane saw combat, some of its flaws and some information about one of the engines used(temporally until i find more info about both engines)

Edit #2: I change the base engine because most of the test were made with the R-1830-SC-G (so i need new info about them), added a an official cutaway and added more story about the wars it was in

 

Edited March 26, 2020 by mpata10

[Sabeda 171]

Fantastic work so far

[mpata10 92]

On 31/1/2017 at 5:31 PM, Sabeda said:

Fantastic work so far

Thx i need a viable source for the engine and i am starting to do another data sheet for the I.Ae 30 ñancu/namcu

Edit: I could use one internet page but it wouldn be okay for the data sheet https://airandspace.si.edu/collection-objects/pratt-whitney-twin-wasp-r-1830-43-radial-14-engine

Edited February 27, 2017 by mpata10

[Sabeda 171]

23 hours ago, mpata10 said:

Edit: I could use one internet page but it wouldn be okay for the data sheet https://airandspace.si.edu/collection-objects/pratt-whitney-twin-wasp-r-1830-43-radial-14-engine

 

I think the Smithsonian is a good enough source to make an exception

[blockhaj 3,560]

On 2017-01-31 at 9:40 PM, mpata10 said:

Thx i need a viable source for the engine and i am starting to do another data sheet for the I.Ae 30 ñancu/namcu

Edit: I could use one internet page but it wouldn be okay for the data sheet https://airandspace.si.edu/collection-objects/pratt-whitney-twin-wasp-r-1830-43-radial-14-engine

U need generally 2 separate sources stating the same performance or stats. But if u struggle to find info do to the archives.

 

Also for the sake of completing the Latino tree there needs to be 2 variants.

Edited February 3, 2017 by blockhaj