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MITSUBISHI Ki-46 DINAH PERFORMANCE/TIMELINE


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#1 CORSNING

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Posted 19 March 2016 - 09:09 PM

Mitsubishi Ki.46-II "Dinah 2"

 

The following performance figures and specifications come from TAIC report 253A-2.

 

Altitude / Speed / Climb / Time to altitude

Meters  / mph    / fpm    / minutes

SL          310     3010

  1,000   323     3068      1.1

  2,000   336     3126      2.15

  3,000   349     2969      3.45

  4,000   348.5  2522      4.85

  5,000   354     2588      6.2

  6,000   368     2472      7.7

  7,000   365     2033      9.45

  8,000   356     1595    11.45

  9,000   345     1155    13.55

10,000   329       716   

Feet     / mph    / fpm    / minutes

  5,000   333     3098      1.7

10,000   350     2947      3.6

15,000   348     2560      5.7

20,000   370     2429      7.9

25,000   360     1760    10.7

30,000   342     1090    14.0

35,000   313       421

 

Speed:

Full throttle height low supercharger: 351 mph./10,300 ft. (3,140 m.)

Switch from low to high supercharger: 347 mph./14,800 ft. (4511 m.)

Full throttle height high supercharger: 372 mph./20,500 ft. (6,250 m.)

Climb:

Critical altitude low supercharger: 3,160 fpm./8,500 ft. (2,590 m.)

Switch from low to high supercharger: 2,520 fpm./13,000 ft. (3,962 m.)

Critical altitude high supercharger: 2,630 fpm./18,500 ft. (5639 m.)

 

Ceilings:

Combat: 30,680 ft. (9,351 m.)

Operational: 34,410 ft. (10,488 m.)

Service: 37,400 ft. (11,400 ft.)

 

Range: 1,795 mls./158 mph./1,500 ft (2,889 km./254 kph./457 m.) with 438 gallons of fuel.

 

Armament: 1 or 2 x 7.7 mm.

 

Wing Area: 344.44 sq. ft.

 

Engine: 2 x Mitsubishi Ha-102: 1,065 hp./S.L.   1,135 hp./8,500 ft. (2,590 m.),  1,040 hp./9,200 ft. (2,804 m.)

        1,020 hp./18,000 ft. (5,486 m.),   935 hp./19,000 ft. (5,791 m.)

 

Combat Weight: 11,882 lbs. (5,388.7 kg.)

 

Wing Loading: 34.50-lbs./sq. ft.

10002335t4.jpg

World of Warplanes

Power Loading: 5.234+lbs./hp.


Edited by CORSNING, 11 May 2016 - 12:57 PM.


#2 CORSNING

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Posted 20 March 2016 - 01:07 PM

Mitsubishi Ki.46-III "Dinah 3"

 

The following information comes from TAIC report 253B-2

 

Altitude / Speed / Climb / Time to Altitude

Meters / mph     / fpm    / minutes.

S.L.       350       4230      

  1,000   364      4226       1.0

  2,000   371      3921       1.9

  3,000   366      3856       3.0

  4,000   380.5   3902       4.0

  5,000   395      3947       5.2

  6,000   405      3390       6.5

  7,000   398      2794       7.0

  8,000   389      2198       9.3

  9,000   375      1602     11.2

10.000   358      1007 

Feet       / mph    / fpm    /minutes

  5,000   371      4066       1.5

10,000   366.6   3858       3.1

15,000   389      3928       4.8

20,000   400      3333       6.7

25,000   392      2425       8.9

30,000   373      1516     11.55

35,000   337        608    

 

Speed:

Full throttle height low supercharger: 372.5 mph./5,400 ft. (1,646 m.)

Switch low to high supercharger: 366 mph./9,900 ft. (3,519 m.)

Full throttle height high supercharger: 407 mph./19,000 ft. (5,791 m.) (graph).

     The specification chart states 407 mph./19,300 ft. (5,882.6 m.)

 

Climb:

Critical altitude low supercharger: 4280 fpm./2,700 ft. (823 m.)

Switch low to high supercharger: 3,825 fpm./7,600 ft. (2,316 m.)

Critical altitude high supercharger: 3950 fpm./16,600 ft. (5,060 m.)

 

Ceilings:

Combat: 32,840 ft. (10,010 m.)

Operational: 35,600 ft. (10,851 m.)

Service: 37,800 ft. (11,521 m.)

 

Range: 1,915 mls./158 mph./1,500 ft. (3,082 km./254 kph./2,414 m.) with 499 gallons of fuel.

 

Armament: 1 or 2 x 7.7 mm.

 

Wing Area: 344.44 sq. ft.

 

Engine: Mitsubishi Ha 112-II: 1,580 hp./S.L.,   1,470 hp./4,000 ft. (1,219 m.),   1,340 hp./17,000 ft. (5,182 m.)

     1,340 hp./19,700 ft. (6,005 m.).

 

Combat Weight: 12,405 lbs. (5,625.9 kg.)

 

Wing Loading: 36.01+lbs./sq. ft.

 

Power Loading: 3.926-lbs./hp.kugyt.jpg

                                                lasegundaguerra


Edited by CORSNING, 19 March 2018 - 07:29 PM.

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#3 GregP

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Posted 19 April 2016 - 04:59 AM

Damned fast twin for it's time and state of development, I think.

 

Agreed, Jeff


Edited by CORSNING, 20 April 2016 - 08:04 PM.


#4 Romantic Technofreak

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Posted 21 April 2016 - 09:49 AM

...state of development...

 

My friend made an examination if it is possible to upgrade the Dinah by installing BMW 801 engines. He found out they were much too heavy. So the airframe was on its limits. The space between the two crew members is also completely filled by the fuselage fuel tank, so there is no place for an internal bomb bay.

 

To break even and outreach the Mosquito, a considerable expansion of the airframe would have been necessary. I still think there were chances to achieve it.

 

Regards, RT


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#5 CORSNING

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Posted 11 March 2018 - 07:55 PM

Mitsubishi Ki 46 Timeline

 

12 December 1937: The Koku Hombu issued to Mitsubishi a specification for a fast

     long-range reconnaissance aircraft. Endurance 6 hours at 400 km/h (249 mph.)

     between 4,000 m. (13,125 ft.) and 6,000 m. (19,685 ft.). Maximum speed was 

     to be 600 km/h/4,000 m. (373 mph./13,125 ft.). Armament to be one 7.7 mm

     type 89 rear-firing machine gun. The choice of engines either single or twin:

     790 hp. Nakajima Ha-206, 950 hp. Nakajima Ha-25 or 850 hp. Mitsubishi Ha-26.

     Note: The task of reaching these goals was assigned to Tomio Kubo and Joji

     Hattori, who, from the outset, placed all emphasis on aerodynamic cleanliness,

     adopting the minimum practical fuselage cross section and the thinnest available

     wing section, while the Aeronautical Research Institute of the University of Tokyo

     devoted its attention to the development of close-fitting, low drag cowlings for the

     Mitsubishi Ha-26 that had been selected to power the new aircraft.

 

 

Early November 1939: The prototype was completed at Mitsubishi's Nagoya plant.

 

 

Late November 1939: The first flight piloted by Major Fujita at the controls took place

     at Kagamigahara in Gifu Perfecture. The maximum speed reached was 540 km/h

     (335.5 mph.) at 4,000 m. The engines were two Mitubishi Ha 26-1 of 900 hp. at

     3,600 m.

 

Note: Even though the speed of the Ki 46 fell short of the specifications it was still

     faster than the Ki 43-1 (308 mph.) and A6M2 (331 mph.) undergoing trials at that

     time so production of an initial batch was authorized under the designation Army

     Type 100 Command Reconnaissance Plane Model 1.

 

Note: Mitsubishi had developed an advanced version of its Ha-26-I (Ha-102) Army

     Type 101) engines with a 2-speed supercharger anticipated to develop 1080 hp./

     T.O.,  and 1,035 hp. at 2,800 m. Take-off horse power was reached but the

     and the engine could actually reach 1,050 hp./2,800 m and 950 hp./5,800 m.

     With this engine the Ki 46 was anticipated to easily reach the initial

     requirement speed. Mitsubishi was instructed to proceed with the Ki 46-II.

 

Late Spring 1940: The pre-series Ki 46-Ko (Ki 46-I) began to appear. These were

     assigned to special units for intensive service evaluation and the Shimoshizu

     Army Flying School for pilot training.

 

June 1940: Vapor locks occurred frequently under hot and humid weather conditions

     so test were conducted in Formosa on the Ki 46-I. The Ki 46-II also went into these

     test in June 1942. Correction were found by the changing from 87 to 92 octane fuel

     and relocating the fuel lines around the engines.

 

March 1941: The first Ha-102 powered Ki 46-II was completed. Flight trials revealed a

     maximum speed of 604 km/hr. at 5,800 m. (19,030 ft.). Range was increased to

     2,485 ml./257 mph. (4,000 km/414 km/h).

 

July 1941: Ki 46-II aircraft were delivered to the 18th, 50th, 51st, 70th, 76th and 81st

     Dokuritsu Dai Shijugo Chutais in Manchuria and China. The following is from pilot

     notes: Oil overheated during the long climb to cruising altitude necessitating

     slower rate of climb. The ailerons responded slowly and the rudder was ineffective.

     The oxygen system was unreliable during long flights. Due to the aircrafts high rate

     of sink, the undercarriage often collapsed on landing.

 

Note: Constant modifications eventually corrected the major difficulties.

 

20 & 22 October 1941: Captain Ikeda, commanding officer of a unit of Ki 46-IIs, that had

     been moved to French Indo-China, reconnoitered the area selected by the Japanese

     High Command for the planned amphibious landings in Malaya.

 

Note: When hostilities finally broke out, the Ki 46 units were deployed in small detachments

     to cover the entire Southeast Asia area. The Army Type 100 Command Reconnaissance

     planes were able to perform their missions with almost complete freedom from interception.

     This was due to two reasons. There was no ground control radar to guide the Allied

     obsolete fighters and the speed of the Ki 46. This ability attracted the attention of the

     Japanese Navy which negotiated the acquisition of a small number of the type.

 

May 1942: The Koku Hombu had anticipated the arrival of faster Allied fighters and instructed

     Mitsubishi to install their new 1500 hp. Ha-112-II into an improved version of the Ki 46 in

     order to increase its maximum speed to 650 km/h (404 mph.) and its range by one hour.

     Fuselage fuel capacity was increased from 1675 liters to 1895 liters. Provisions were made

     for a 460 liter ventral drop tank. The landing gear was strengthened. The rear-firing 7.7 mm

     machine gun was removed. The forward fuselage was changed and a new, more aero-

     dynamic canopy was installed.

 

December 1942: Two Ki 46-III prototypes were completed with individual exhaust stacks which

     increased speed slightly. Performance improved markedly between 8,000 m. and 10,000 m.

 

June 1943: Initial studies began to develop the Ki 46-III as a high-altitude interceptor by the

     Rikugun Kocugijutsu Kenkyujo (Army Aerotechnical Research Institute). (K 46-III KAI)

 

1943-1944: Four Ki 46-IV (Tei) prototypes were built with 2 Ha-112-ii Ru engines capable of

     1,500 hp./T.O., 1,250 hp./ 7,000 m., 1100 hp./10,200 m.,   that used exhaust-driven

     turbo-superchargers. Fuel capacity was increased to 1,977 liters.

 

February 1944: Ki 46-IV flight test began, but difficulties with the turbo-supercharger delayed

     production.

 

October 1944: The first Ki 46-III KAI was completed.

 

November 1944: The Ki 46-III Kai began to be delivered to Operational units defending Japan.

     The aircraft proved to be a disappointment because of its slow climb (once armed and

     armored), taking 19 minutes to reach 8,000 m. All photographic equipment had been 

     removed and the nose was redesigned to hold two 20 mm. Ho-5 cannon. The central

     fuselage fuel tank was removed and a forward obliquely mounted 37 mm. Ho-203 cannon

     was installed.    

 

December 1944: The Nagoya plant producing Ki 46-IIs and -IIIs was heavily damaged by an

     earthquake and Allied bombing. It was forced to move to Toyama, where only about 100

     Ki 46s were completed.

 

February 1945: Two Ki 46-IVs flew 2,301 km at an average speed of 700 km/h with a strong

     tail wind.

 

Note: Koku Hombu: Imperial Army's Air Headquarters.

 

References:

     Air International Vol.19 No.5

     Japanese Aircraft of the Pacific War by Rene J Francillon


Edited by CORSNING, 19 March 2018 - 07:01 PM.


#6 CORSNING

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Posted 19 March 2018 - 07:26 PM

Air International Vol.19 No.5

Referring to the Ki 46-I (Ko)

     "From the viewpoint of the pilot, the Ki 46 possessed no serious vices. Although

the nose-up attitude of the aircraft (on ground) tended to produce restricted forward

view until the tail came up, the handling characteristics during take-off were generally

good. The rudder was not as effective as might have been desired and aileron

response tended to be lethargic, but the role that the Ki 46 was intended to fulfil did

not call for extreme agility and it was generally considered that the controls were

adequately effective throughout the speed range."



#7 CORSNING

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Posted 20 March 2018 - 08:53 PM

Air International Vol.19 No.5 Pages 232 & 233

 

Heading: A more militant Dinah

     "Lacking the climb rate and agility desired in a fighter (when loaded with armament

and ammunition)- factors which had led to the discarding of a projected fighter adapta-

tion of the Ki 46 in the summer of 1943 - the reconnaissance aircraft had only its

high-altitude speed and considerable endurance to commend it as a B-29 interceptor,

but these characteristics were now considered sufficient to warrant reactivation of the

Ki 46 fighter project, and in May 1944, a month before the B-29 made its debut over

Japan, work had, in fact, been resumed on such an extemporary interceptor, this task

receiving the highest priority in June.

     The conversion consisted of the removal of the forward fuel tank and the photo-

graphic equipment, and the introduction of a stepped windscreen for the pilot, an

entirely new nose mounted two 20 mm. Ho-5 cannon with 200 rpg, and , aft of the

main fuel tank, an obliquely-mounted 37 Ho-203 cannon firing forward and upward,

this being provided with eight 25-round magazines loaded by the observer.

     Some 200 aircraft were converted for the B-29 interception task with which they

enjoyed only qualified success, being inhibited by poor climb rate and inadequate

firepower. The obliquely-mounted 37 mm weapon proved ineffectual and the airframe,

sturdy enough for the role for which it was designed, lacked the ability to absorb much

battle damage. In fact, it had little more than a good high altitude performance to

commend it, this including speeds of 379 mph. (610 km/h) at 29,530 ft. (9,000 m)."




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