Late War JAAF Propeller Green

There are different reports on the distinctive green painted finish of late-war JAAF propellers. Shown here are some of them.

Munsell 10 GY 3/2 is the colour recorded by Ichiro Hasegawa from the recollections of Tadamitsu Watanabe as depicted in Model Art 284. Kenji Ishikawa disagrees with this interpretation.

Munsell 5 GY 3.5/2.3 is reported by Noboro Shimoune as the late-war prop colour for the Ki-84, Ki-87, Ki-43 III Ko, Ki-94, Ki-100, Ki-102 and Ki-106 aircraft.

Munsell 2.5 G 4.5/2 is the colour reported in Model Art 395 specifically for the Tachikawa-built Ki-43 III Ko prop from information provided by Tachikawa Chief Designer Kenichi Oshima and Tachikawa sources. It is a paler, brighter green than the Shimoune swatch.

Munsell 5 G 3/1 is the dark greyish-green paint of swatch 2-3 recorded in the 8609 Feb '45 joint IJN/JAAF paint consolidation document.

Image credit: Rendered chips © 2009 Straggler

New RS Models Tachikawa Ki-9 in 1/72nd scale

Although still listed as a 'future release' Hannants website now has images of the two 1/72nd scale Ki-9 kits announced from RS Models.

The "standard" kit has markings options (provided by Rising Decals) for Japanese,Chinese Republic, Nanking Government (a Japanese puppet regime in China) and Thai versions.The 'special unit' kit has options for Japanese special attack ("Kamikaze"), Manchoukuo, Korean and captured American versions.

As with recent RS re-issues windscreens and clear parts are injection molded and the photo-etch includes pre-painted instrument panels. 

One to look forward to I think. Now, about that orange . . . or is it yellow . . . 

Image credit: © 2009 RS Models & Hannants 

Osprey 85 Ki-43 'Oscar' Aces

The awaited Hayabusa title in Osprey's Aircraft of the Aces series is now available and provides a long overdue recognition of the importance and significance of the type to the JAAF. Hiroshi Ichimura's text is masterful, offering a fascinating insight into the operations of this charismatic JAAF fighter on all fronts, beyond the usual chronological give and take of victories and losses. First hand accounts by pilots and maintenance crew add significantly to the value of the book and include interesting facts about the armament and useful comparisons with the Ki-84 and Spitfire. The Hayabusa ground attack role in Burma is revealed in more detail than ever before, as are the 'Tsujigiri' ('street murder') sorties against Allied transport aircraft in the theatre.

The photographic content is good, although suffering from the usual Osprey house style of rather small sized images, and there are one or two that have not been published before. Understandably, these focus more on personalities than aircraft. There are some minor errors in captioning. For example the Ki-43-II Kai on page 86 was not "found abandoned on Okinawa by invading US forces" but rather was landed in error on an already overrun airstrip, the ferry pilot being killed as he left his aircraft. 

The only disappointing aspect of the book is the colour profile section by Jim Laurier. Although technically and artistically excellent, the profiles perpetuate a number of errors which undermine their value to modellers. The 64th Sentai's well known arrowhead insignia is incorrectly depicted. The arrowhead was perfectly symetrical to the shaft, not asymetrical as Mr Laurier has depicted it, which has resulted in some distinctly "wonky" looking arrows! This error has occurred in a number of previous profiles (and decals) but is surprising given the photographic evidence available. Nango's fuselage stripes were more likely blue rather than the red depicted, as discussed here. The Chutai-colour painted elevators which were an integral part of the 1st Sentai's insignia are not apparent. The Ki-43 III Ko aircraft are shown in the same generic olive greens as the majority of profiles with natural metal (?) undersurfaces rather than the factory scheme of ohryuko nana-go shoku as reported here. The distinctive water-methanol filler spouts are also missing from the depictions of this particular version. Overall the rather dull and uniform appearance of the profiles limits them as a source of inspiration. There is no concession to the waxed and highly polished appearance of some aircraft (0ver Burma for example) and the treatment of camouflage colours is superficial, with the greens especially dull and homogenous throughout.

Side view plans by Mark Styling  in 1/48th scale of the Ki-43-I, Ki-43-II and Ki-43-III are provided with part plan and forward views of the Ki-43-II. No attempt has been made to explain or depict the various production versions of the Ki-43-II. 

Very highly recommended for the text but view the colour profiles with caution. Some interesting revelations in the book will be highlighted and explored further.

Image credit: © 2009 Osprey Publishing Limited

Ki-43 III Ko Colours ~ Part 3

The splendid box art for the 1964 Tamiya 1/50th scale Ki-43 III Ko depicting an aircraft of the 48th Sentai over China, is ambiguous in appearing to show a slightly olive green version of ohryoku 7 go shoku with natural metal undersurfaces. The instructions, however, are interesting in that they suggest that the upper surfaces were "brown (just like olive drab)" and that the under surfaces were "The same as that for upper surfaces excepting that it has been lightened with white."  This description exactly conforms to the recollections of Mr Shimoune.

Although the study is ongoing the following paint colours have been identified as being applied to JAAF drop tanks:-

1. An unidentified neutral grey - for which the closest FS value is 36293 @ 2.13 (it is slightly too blue). This appears to be the colour of the drop tanks on the aircraft in the colour photograph posted below.

2. A pale blue-green, JAAF paint standard # 17 'Tan Sei Shoku' - for which the closest FS value is 25352 @ 2.25, a good match.

3. The yellowish green colour # 29 'Ki midori iro' - for which the closest FS value is 34151 @ 2.15, not quite yellow enough. This colour was also used for cockpit interiors.

4. The olive drab #7 'Ohryoku nana-go shoku' - also used for top surface camouflage and interiors, the approximate FS equivalents to which are 33070/34088. The swatch included above is gradiated from left to right to show the brown to green ends of the colour range for this paint.

5. Yellow - which is presumed to be the standard orange yellow in use for IFF strips and trainers (q.v. Army Trainers) although a Ki-84 Hayate tank is cited to be in a yellow colour of approx FS 33655 to 33538.

Image credits: Box art & instruction sheet  © Tamiya  1964; Rendered colour swatches © Straggler 2009

Ki-43 III Ko Colours ~ Part 2

The colour value derived from an original swatch prepared by Mr Noboru Shimoune to illustrate the Ki-43 III Ko upper surface colour is Munsell 7.5 Y 3/1.5. The closest FS value to this is 33070 @ 2.49, which is just a little lighter. The RAL colour 6014 Gelboliv (Yellow olive) is slightly closer @ 2.36, but is a little darker. The colour is within the range for the JAAF Standard Ohryoku 7 go shoku which became colour standard 1-1 in the joint Army-Navy document 8609 of February 1945. 

This top surface olive-drab colour was also associated with the Ki-54, Ki-74 and Ki-94.

The swatch for the propeller colour is Munsell 5 GY 3.5/2.3 and the closest FS value is 34092 @ 2.14, which is just a little greener and not quite grey enough. Previously this colour was visually matched to FS 24172 for a 1/72nd scale model, but that is a lighter shade (the DE2000 difference calculation between 34092 and 24172 being 10.2). 

The under surface colour was visually matched to FS 36405 from a piece of extant stabilisor taken from a 64th Sentai Ki-43 III Ko in Malaya. This is a creamy "stone" colour, the closest Munsell value to which is 5 Y 7/2 @ 2.16. The top surface of this piece was visually matched to FS 34088. Mixing the upper surface colour 34088 with white results in an almost exactly similar colour to 36405.

From Mr Shimoune's article I understand the interior colour to have been the same as the top surface olive drab, which was in accordance with the Army Aircraft painting regulations (Rikugun kokuki tosou kitei) of 15th June 1943. However, Mr Kenichi Oshimo, the chief designer for the Ki-43 III recalled that the interior was painted with green or grey-green paints similar in appearance to FS 34128 and 34159 respectively. In the colour photograph the rear decking area under the canopy does not appear to be black but rather a dull olive green or olive drab colour.

"Nohryoku- shoku" as referred to in Mr Shimoune's article relates to IJA Green (Mr Color #16), Dark Green (Nakajima) (Mr Color #129) or Dark Green (Kawasaki) (Mr Color #130). The first kanji "noh" may be translated as "strong" or "dense" so "deep green" may be a suitable description.

"Anryoku-shoku" as referred to in the article relates to IJN Green (Mr Color #15) or Dark Green (Mitsubishi) (Mr Color #124). The first kanji "an" may be translated as "dark" so "dark green" may be a suitable description.

The two colours in the original JAAF standards that also use these descriptions are #22 'Noh Ryoku Shoku' and #26 'An Ryoku Shoku', but unfortunately the precise nature of the appearance of these colours is not known. 

Very special thanks to Isamu Marahashi for kindly clarifying these colour descriptions.

Image credits: Ki-43 III Ko schematic © William Leyh & Nick Millman 2005; colour swatch renderings © Straggler 2009

Ki-43 III Ko Colours ~ Part I

Ta.Gucci has posted an interesting profile at his blog of a well known Hayabusa Ki-43 III Ko photographed in colour at Kimpo, Korea, just after the war*. The post includes, via Maru-san, a fascinating report on the factory painting of the III Ko aircraft by Mr Noburo Shimoune who was involved in manufacturing the Hayabusa at Tachikawa Hikoki. Isamu Maruhashi has very kindly translated this interesting and useful post into English for us.

"The 1968 Koku Joho magazine supplement scale model guide 'Japanese Aircraft of WWII' has a section written by Mr Noboru Shimoune who was involved in manufacturing Hayabusas for Tachikawa Hikoki. The article reads as follows:-

"The Model 3 Koh which appeared at the end of 1944 was painted in the same manner as the previous Model 2 Kai in that all aircraft had both their top and bottom surfaces painted at the factory. Conventional magazines and scale model instructions often state that these aircraft were not painted when shipped and that they were painted with Anryoku-shoku blotches in the field, but this is total nonsense. The single-exhaust pipe Model 2 Kai was initially shipped unpainted to units and painted in the field, so maybe they are being mistaken for Model 3s.

"The top surface of Model 3s were painted a dark Tsuchi-iro (earth or clay colour). It was a brownish colour rather than a greenish colour. (For whatever reason, people keep insisting that the colours were Nohryoku as if that's the only colour they can contemplate). I was familiar with the sight of unpainted Type 1 fighters, so I was appalled at the dirty colour that they had painted them. If we go by the colour of the plastics used in molding scale models, the colour was close to that of the plastic used to make the Monogram P-40s and P-51Bs (although it was a little lighter in tone).

"(This doesn't have any direct relation to this story, but in the fall of 1944 the Sentai of new Hiryu Type 4 Heavy Bombers at Tachikawa Base were also painted a colour similar to the Type 1 Model 3 Fighter. This colour was close to Pactra Olive Drab. The underside was painted black).

"Getting back to the Type 1 Fighter, I want to say that the underside colour was gray, but it was not Nezumi-iro (rat or mouse colour). Rather it was a colour similar to the top colour but lightened with white. This was totally flat colour. The boundary of the two colours were spray painted and the border slightly soft. None of the airframes were painted with the black anti-glare paint that was used on unpainted aircraft. The headrest inside the canopy was painted black, the cap of the methanol tank behind the headrest was painted silver, and all other colours were the top surface colour. The seat was unpainted duraluminum and an anti-corrosive was not applied to the interior. None of the Hinomarus had white outlines. However there were some airframes that had Hinomarus inside white bands on both the wings and fuselages. The propellers and spinners were painted Ebi-cha-iro (red brown colour), and they were the same as other airframes in that there was one yellow stripe at the tips of the propeller blades, but near the end of the war the propellers were painted Nohryoku-shoku, and the tips were painted yellow like the American planes, (both in front and back). The Model 3 Otsu airframes were equipped with these Nohryoku-shoku propellers.

"On the top of the left wing root a black sandpaper-like anti-slip material was applied along the fuselage, and pilots stepped on this when boarding their planes. The fuselages did not have any steps, so one piece of green rope was hung down from the cockpit, and the pilots grabbed those ropes when boarding their fighters. The landing gear wells were totally painted in blue anti-corrosive primer. The commercially available Humbrol metallic blue is a close colour. The navigation lights that stuck out up and down from the ends of the wings were naturally red and green (some were blue), but when they were not lit they looked black. The tail light was white. The antenna pole was Ebi-cha-iro."

"This account shows that what we thought from colour photographs to have been an overall "gray" colour was actually - (!) And then from the latter half of 1944 the top sides of the aircraft were painted "Ohryoku 7-go Shoku" directly in the factory. And surprisingly the undersides were a cafe-au-lait like colour in which the Ohryoku 7-go Shoku was mixed with white. An overall flat colour. The author also mentions his impression ("dirty colour") and I can certainly sympathise. When the propellers had one yellow line they were painted the aforementioned dark brown. When the tips were totally yellow, the propellers were painted "Nohryoku-shoku". In most cases the propellers of aircraft in use were Hamilton-type propellers made by Sumitomo Metal, and since it can be assumed that there were no individual differences in the propellers, this difference in colour might have been a way of warning maintenance personnel that these different coloured propellers were not interchangeable.

"We had not filled in the fuselage Hinomarus, but thanks to Maru-san's description we have added them. Since it was the second half of the war, not having a fuselage Hinomaru was inconceivable, so the fuselage in the photograph must have been left abandoned for so long that the Hinomaru could not be seen because of weathering and fading of the colours.

"In any case I would like to thank Maru-san for helping us to understand so much about them."

Whew! That's enough to be going on with I think. We'll take a closer look at the colours mentioned here in Part II.

With very grateful thanks to Maru-san and Ta.Gucci for bringing back this fascinating information from the past and especially to Isamu Marahashi for allowing us to read it in English without the puzzling confusion of a machine translation! 

*Image credit: Pacific War Eagles in Original Colour, © Jeffrey L Ethell, 1997