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Mitsubishi A7M « Reppu » ("Sam")

blackkite

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CherryBlossom said:
Hello chaps,

Bumping an old thread :p

Do we have anything on the A7M3 specifically? Perhaps original drawings, info on its engine/turbocharger? I see more of the A7M3-J (which i am more fond of personally) but hear very little about the other model.

Do we have much on it?

Cheers!

Cherry
Hi!
MK9C engine(Ha-43-51 series) : Single stage three speed mechanical supercharger
 

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blackkite

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Hi!
Please try Japanese English automatic translater. ;)
http://www.warbirds.jp/data/jp/htm/a7m3.htm

Base HP
http://www.warbirds.jp/data/index.html
 

CherryBlossom

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Hello black,

Unfortunately when i ever i go on that website, it comes out like this: http://i.imgur.com/ej5RTJB.png :(
 

CherryBlossom

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lastdingo said:
The A7M1 will soon be in the "War Thunder" game, so expect the internet to be polluted with ingame (CGI) images of the Reppu soon. ;)
Oh yes. It will be the highest resolution model available on the internet. The cockpit is simply amazing, showing such careful detail.
 

blackkite

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Mitsubishi high altitude ko fighter, temporary name : three speed Reppu/experimental high performance Reppu(A7M3).
 A7M3 fighter development began in March 1945 as temporary name three speed Reppu(A7M3).
A7M3 fighter was selected one of the candidate for next Ko fighter in parallel with Reppu with Ha-44 engine by the unified research workshop between military members and civil company members. These Reppu were the last Reppu.
The fuselage of A7M3 fighter was almost same as A7M2 fighter, also the wing without wing tip folding mechanism was almost same as A7M2 except additional reinforcement due to more heavy armaments requirement. Other equipment were also same as A7M2 fighter.
A7M3 fighter had a Ha-43 type 51 engine(MK9C).
MK9C engine first stage three speed supercharger impeller diameter was enlarged to 335mm.
Power were as follows.
First speed full throttle : 2,000hp/1,800m/2,800rpm, Second speed full throttle : 1,800hp/5,600m/2,800rpm, Third speed full throttle : 1,660hp/8,700m/2,800rpm
A7M3 increased high altitude performance and propeller diameter was 0.1m larger than A7M2 propeller.
A7M3 armaments were newly designed six 99-shiki 2-go type 5 fixed 20mm cannon installed at the wing instead of A7M2’s four 99-shiki 2-go type 4 fixed 20mm cannon.

99-shiki 2-go type 5 fixed 20mm cannon retreat part was 1kg lighter than type 99-shiki 2-go type 4, and had a more strong accelerated spring, keeping initial velocity as 750m/s, launch speed increased from 620 bullets per minutes(type 4) to 720 bullets per minutes.
But reaction force became from 1.5ton(type 4) to 2.5ton, type 5 required structural reinforcement for the aircraft.
Bullet proof equipment of A7M3 fighter adopted the exterior system bullet proof tank (Was rubber thickness 22 mm?) about a body fuel tank. It wasn't adopted because the bag system bullet proof tank wasn't developed at all because of a problem of the material of the oil-proof synthetic fiber while equipment was scheduled by A7M2 fighter and A7M3-J fighter. Tanks in the wing was equipped with only automatic extinguish device.

It was expected to be equipped with 55 mm of bulletproof glass for pilot head protection to the column which protects a pilot at the time of the airplane overturn established behind the cockpit in A7M3 fighter.
It's believed that these bullet proof equipment is proportionate to Yokosuka flying corps following request to the next fighter "fuselage tank: rubber cover", "tank in the wing: Perfect automatic fire extinguishing", "pilot: Rear defense".

The concrete numerical value of onboard fuel capacity of A7M3 fighter is unclear.
But when the capacity of each fuel tank is as follows from the plan value of the cruising range, it's almost logical.
* The capacity of the body front tank of A7M3 fighter is identical with A7M2 fighter.
* The tank in the wing of A7M3 fighter is same as A7M1 early stage experimental production type mostly. There is 350L for the capacity of the tank. A tank isn't put by a bullet proof measure into effect.
* Body rear fixed additional tank of A7M3 fighter is changed to a tank with the about two times of capacity of A7M2 fighter.

The nominal gross weight of A7M3 fighter is said to be "5042 kilogram", but this numerical value is the numerical value which has just added the equipped amount in the fuselage of "machine gun and ammunition" "fuel" "aqueous methanol" to prudence, and when being regularly fully equipped, the weight of the ammunition fuel which isn't loaded includes.
On the other hand, It seems that the weight of the crew, the parachute, the bulletproof glass, the oxygen inhalation equipment and all kinds' radio equipment not to include.
When zero, Raiden, the numerical value of 11 type Reppu, A7M3 accessories and the fuel capacity above-mentioned are consulted, the nominal gross weight of A7M3 is estimated by a little more than 5000 kilogram and the over load weight at a little less than 5800 kilogram.

Development of A7M3 fighter was developed smoothly relatively, and completion of experimental production number 1 was scheduled for December, 1945, 9 months later from development starting.
A wooden mockup examination of A7M3 fighter was scheduled for August 16, 1945.
HA43 type51 engine while it was a durable test using the experimental production engine which has been just completed in July, 1945.
99-shiki 2-go type 5 20mm fixed cannon was in the situation that increased experimental production 60 cannons were completed by July, 1945, and was putting a shooting basic experiment by Reppu fighter.
It's said that A7M3 fighter which can be called the normal evolution type of A7M2 fighter had big expectations from each district. But the most part of design data of A7M3 fighter is undiscovered. Details of a shape change in a nose of a plane and a main wing of A7M3 fighter by engine replacement and reinforced armament are obscurity up to now.

The specification (the planned value)
The span
14.000m
The full length
Unclear
The total height
4.230m
The wing area
30.86m2
The empty weight
3392 kilogram
The gross weight (regular)
5042 kilogram
Over load
Unclear
Fuel
915 kilogram of onboard
Aqueous methanol
200L
Lubricating oil
Unclear
The max speed (at the time of regular full equipment)
643 km /h/8,700m
Climbing time (at the time of regular full equipment)
13 minute 64 second /10,000m
The rise limit
11,300m
The cruising range
Maximum speed for 0.5 h+ 417 km /h/4,000m cruise for 2.7 h
Armament
20 mm machine gun in the wing x 6 (number of biggest bullets 200 shots for each)
The engine
The Mitsubishi "HA 43 type51 (MK9C) Air-cooled radial 18 cylinder Takeoff power 2,130hp/2,900rpm x 1
Propeller
Sumitomo V.D.M. constant speed 4 blades (diameter 3.700m)

Source : http://www.warbirds.jp/data/jp/htm/a7m3.htm
 

blackkite

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Hi!
99-shiki 2-go type 4 20mm fixed cannon(九九式20粍二号四型固定機銃) pictures(No.1 picture to No.4 picture) and 99-shiki 2-go type type 5 picture(last picture No.3).
Base model : Oerlikon FF.

And MK9 engine data.
 

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blackkite

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Hi!
Source : Recent Maru magazine
I doubt A7M3-J with HA-44 engine version's long nose.

ハ44エンジン : HA-44 engine(take off power ; 2,400hp)
 

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blackkite

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A7M2 Reppu RC model flight video.
https://www.youtube.com/watch?v=TLHGsRqI7mI
https://www.youtube.com/watch?v=AU4M1p1Ckbs

This is a official A7M2 Reppu general arrangement drawing from temporaly instruction manual.
Source : ISBN978-4-7698-1490-0, Super Zero fighter Reppu, Kojinsha Maru, 2/2/2011

This is a official drawing of A7M1 1/10 wind tunnel test model. (unit : cm)
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=7230.0;attach=514215;image

Please confirm nose shape difference between A7M1 with engine front forced cooling fan and A7M2 without forced cooling fan.
 

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blackkite

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Hi! A7M3 nose drawing in 24/6/1945 and A7M3-J nose drawing in 16/11/1944.
Source : Gakken, Reppu and Reppu-kai(烈風と烈風改), 1/2/2003. ISBN4-05-602990-3

You can see aircraft name A7M3 and A7M3-J at right bottom of the drawing.

A7M3-J.
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=7230.0;attach=76199;image
You can see forced cooling fan, ram air intake behind forced cooling fan and oil cooler air intake behind forced cooling fan.
 

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blackkite

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Hi! A7M3-J original factory drawing.
Intercooler air intake was located both side of the engine nacelle front.

Source : Gakken, Reppu and Reppu-kai(烈風と烈風改), 1/2/2003. ISBN4-05-602990-3
 

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blackkite

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Hi! Reppu-kai A7M3-J high altitude interceptor. The engine was a Mitsubishi MK9A(Ha43-11) (with turbocharger, intercooler and forced cooling fan).
You can see intercooler air intake at front end of the engine nacelle both side in the first drawing.
Also you can see intercooler air outlet slit near wing root leading edge.
中間冷却器空気取り入れ口 : Intercooler air intake

The second (Mitsubishi original)drawing drawn date was 7/7/1945.
⑤⑥中間冷却器導風筒線図(左側/右側) : intercooler air duct lines (left side/right side)
Source : ISBN978-4-05-606328-8 局地戦闘機(Interceptor), Gakken
 

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blackkite

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Thanks for perfect and very detailed drawings!!:)
 
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