Hi! The Tachikawa-Lockheed Type-B High altitude Research-plane(SS-1).
She had the pressurized cabin. Base was Lockheed 14Y. Basic design was performed by Dr.Hidemasa Kimura, the designer of Koken-ki, A-26 long lange aircraft, Kawanishi TB and YS-11. The cabin shape was similar to A-26's.
In 1938, the IJA ordered Tokyo Imperial University to develop high altitude research aircraft.
The basic design of this aircraft begun from 1940. The specification for this aircraft were as follows.
①Number of crews;5 to 7, ②To have pressurized cabin. ③Cruising altitude; 8.000m to 10,000m.
④Endurance;5 to 6 hours. ⑤The pressurized cabin keep 3,000m condition in 8,000m flight.
⑤Utilize Lockheed 14Y's main wing, stabilizers, landing gears.
No1 aircraft completed in August 1943 with Mitsubishi HA-102 modified Zuisei engines(2 stage super charger type), tested. No2 aircraft completed in 1944, BTW stop test and development because priority was low.
This pressurized cabin technology was applied to Tachikawa Ki-74 long range high altitude bomber and Ki-94 high altitude high speed interceptor.
Wing span:19.964m, Length:11.758m, Height;3.46m, Wing Area:51.2 square meter,
Empty weight;5,157kg, Gross weight;6,740kg, Maximum speed;475km/h(5,800m),
Cruising speed;360km/h(8,000m), Service ceiling;10,000m, Endurance;5.6hr,
Engine;Mitsubishi modified HA-102(take off power;1,80hp, 1,055hp(2,780m), 955hp(5.760m)
Source;My No1 and No2 bible.