Yokosuka D5Y Myojo Kai 'special attacker'

[Acolyte]

I could find no information about this design whatsoever. It was produced specifically for suicide attacks. Does anyone have more info? The one I could find is in Polish: http://www.samoloty.ow.pl/str009.htm

Thanks,

Acolyte

[Topspeed]

Looks like a plane that will not penetrate the AAA fire on board US flagships and carriers...in other words a suicide.

[Acolyte]

Well, as a dive bomber it probably had more chance to penetrate AAA fire than fighter aircraft used as kamikazi. Provided it was flown by an experienced pilot, of course.

[PapageiStaffel]

Hi,

I guess the real name is Yokosuka D3Y Myojo ( Venus)
Two D3Y1 K ( single-engine bomber trainer) were built at the Dai-Ichi Kaigun Koku Gijitsusho at Yokosuka in july and august 1944 and three D3Y1 K were built by Matshusita KoKo Kogyo K.K in the summer of 1945.
Y in third position in naval japanese designation system meant Yokosuka
Try this site :
http://www.combinedfleet.com/ijna/d3y.htm

So long.

[tom!]

Hi.

The D5Y was a designed single-seat version of the D3Y2 armed with two type 99 20 mm machine cannons and a fixed mounted 800 kg bomb. There are no indications that a prototype was built.

Yours

tom!

[Acolyte]

Thanks!

[Cantankerous]

Hi.

The D5Y was a designed single-seat version of the D3Y2 armed with two type 99 20 mm machine cannons and a fixed mounted 800 kg bomb. There are no indications that a prototype was built.

Yours

tom!

This thread may be 17 years old, but as noted in the book Japanese Aircraft of the Pacific War by the late Rene Francillon, D5Y1 was the designation for the production version of the D3Y2-K, and construction of the D3Y2-K prototype had begun before the end of World War II.

Link:
https://www.secretprojects.co.uk/thread ... kai.24631/

[fontessa]

Hi.

The D5Y was a designed single-seat version of the D3Y2 armed with two type 99 20 mm machine cannons and a fixed mounted 800 kg bomb. There are no indications that a prototype was built.

Yours

tom!

This thread may be 17 years old, but as noted in the book Japanese Aircraft of the Pacific War by the late Rene Francillon, D5Y1 was the designation for the production version of the D3Y2-K, and construction of the D3Y2-K prototype had begun before the end of World War II.

Link:
https://www.secretprojects.co.uk/thread ... kai.24631/

D5Y1 didn't exist. D3Y1-K 明星 Myojo was the wooden version of D3A Type99 Val. Due to Japan's poor woodworking technology, D3Y1-K could not be put into practical use.


fontessa

[Takao]

D5Y1 didn't exist. D3Y1-K 明星 Myojo was the wooden version of D3A Type99 Val. Due to Japan's poor woodworking technology, D3Y1-K could not be put into practical use.


fontessa

It was not poor Japanese woodworking technology per se.

With the woods used to meet required airframe strength, resulted in much heavier aircraft. The unloaded D3Y was some 500kg heavier than the unloaded metal D3A. This increase in weight, led to a serious degradation in performance.

[ShindenKai]

D5Y1 didn't exist. D3Y1-K 明星 Myojo was the wooden version of D3A Type99 Val. Due to Japan's poor woodworking technology, D3Y1-K could not be put into practical use.


fontessa

It was not poor Japanese woodworking technology per se.

With the woods used to meet required airframe strength, resulted in much heavier aircraft. The unloaded D3Y was some 500kg heavier than the unloaded metal D3A. This increase in weight, led to a serious degradation in performance.

Takao is correct. Japanese wood work/joinery is fairly well known for being some of the best in the world.

https://earthlymission.com/200-year-old ... -no-nails/

https://www.youtube.com/watch?v=7708E1bmoxc

https://www.demilked.com/ancient-japane ... hi-kenkou/

Aircraft built of wood and intended to be flown regularly/safely need very high quality wood with specific grain orientation and tightness. Modern wooden aircraft builders at times have to wait YEARS just to collect the right pieces of wood. Also, there's only a small handful of glues considered safe/stable enough for wooden aircraft construction.

https://www.aopa.org/news-and-media/all ... craft-wood

https://www.eaa.org/eaa/aircraft-buildi ... ood-part-1

https://www.eaa.org/eaa/aircraft-buildi ... ork-basics

Even the fantastic DeHavilland Mosquito had problems staying together in the PTO, high heat & humidity are a bad combo for wood & glues.

[fontessa]

D5Y1 didn't exist. D3Y1-K 明星 Myojo was the wooden version of D3A Type99 Val. Due to Japan's poor woodworking technology, D3Y1-K could not be put into practical use.


fontessa

It was not poor Japanese woodworking technology per se.

With the woods used to meet required airframe strength, resulted in much heavier aircraft. The unloaded D3Y was some 500kg heavier than the unloaded metal D3A. This increase in weight, led to a serious degradation in performance.

Takao is correct. Japanese wood work/joinery is fairly well known for being some of the best in the world.

https://earthlymission.com/200-year-old ... -no-nails/

https://www.youtube.com/watch?v=7708E1bmoxc

https://www.demilked.com/ancient-japane ... hi-kenkou/

Aircraft built of wood and intended to be flown regularly/safely need very high quality wood with specific grain orientation and tightness. Modern wooden aircraft builders at times have to wait YEARS just to collect the right pieces of wood. Also, there's only a small handful of glues considered safe/stable enough for wooden aircraft construction.

https://www.aopa.org/news-and-media/all ... craft-wood

https://www.eaa.org/eaa/aircraft-buildi ... ood-part-1

https://www.eaa.org/eaa/aircraft-buildi ... ork-basics

Even the fantastic DeHavilland Mosquito had problems staying together in the PTO, high heat & humidity are a bad combo for wood & glues.

Thanks for the video about Japanese woodworking technology. I will show one of "Tenontsugi" below. It is a technique that connects pieces of wood only with tenons without using nails without gaps. Beams and columns in Japanese temples were joined by this technique. There were/are many earthquakes in Japan, but almost none of the temples collapsed due to the earthquake. The 法隆寺五重塔 Horyuji Temple Five-storied Pagoda with thick central pillar, 33m high and weighing 1,200 tons, built in AD603, is still intact. It is such a wonderful thing that we can be proud of to the world, but unfortunately, it was not directly involved in the manufacture of wooden airplanes. When I say “woodworking technology”, I mean wood board lamination technology where the adhesive was the key. Japan was unable to make a suitable adhesive, and the prototype of wooden fighter Ki-106 suffered from delamination of the wooden board during test flight. Japan, which saw wooden airplanes only as an alternative to aluminum, fell far short of De Havilland, which was serious about it. Another example where adhesive was key... Luftwaffe paid attention to the superiority of Mosquito and ordered Heinkel to develop a wooden night fighter. The Ta-154 was the answer. As we can see from the model name "Ta", it was designed by the genius Kurt Tank. It was a powerful night fighter with front wheels, two seats and 20mm and 30mm cannons similar to the He-219 Uhu. But the adhesive killed it. The adhesive oxidized and corroded the joints, causing the three prototypes to break down during the test flights, and development was discontinued. In this way, it was not easy to develop a wooden airplane with "Hastily acquired".

法隆寺五重塔.jpg (56.56 KiB) Viewed 1112 times

TA-154.jpg (82.38 KiB) Viewed 1118 times

fontessa

[jbroshot]

Another example where adhesive was key... Luftwaffe paid attention to the superiority of Mosquito and ordered Heinkel to develop a wooden night fighter. The Ta-154 was the answer. As we can see from the model name "Ta", it was designed by the genius Kurt Tank. It was a powerful night fighter with front wheels, two seats and 20mm and 30mm cannons similar to the He-219 Uhu. But the adhesive killed it. The adhesive oxidized and corroded the joints, causing the three prototypes to break down during the test flights, and development was discontinued. In this way, it was not easy to develop a wooden airplane with "Hastily acquired".

The first two Ta-154A-1s disintegrated during high speed test flights. The original adhesive used to bond the wooden parts, called "Tego-Film" was produced by single factory and when that factory was bombed, new bonding agents were tried which proved to be unsatisfactory. The new bonding agent weakened the wood by containing too much acid.

from German Aircraft of the Second World War, by Antony L. Kay and J. R. Smith, 2002 revised edition, page 115

[fontessa]

Another example where adhesive was key... Luftwaffe paid attention to the superiority of Mosquito and ordered Heinkel to develop a wooden night fighter. The Ta-154 was the answer. As we can see from the model name "Ta", it was designed by the genius Kurt Tank. It was a powerful night fighter with front wheels, two seats and 20mm and 30mm cannons similar to the He-219 Uhu. But the adhesive killed it. The adhesive oxidized and corroded the joints, causing the three prototypes to break down during the test flights, and development was discontinued. In this way, it was not easy to develop a wooden airplane with "Hastily acquired".

The first two Ta-154A-1s disintegrated during high speed test flights. The original adhesive used to bond the wooden parts, called "Tego-Film" was produced by single factory and when that factory was bombed, new bonding agents were tried which proved to be unsatisfactory. The new bonding agent weakened the wood by containing too much acid.

from German Aircraft of the Second World War, by Antony L. Kay and J. R. Smith, 2002 revised edition, page 115

Thanks for the comment. I found the same story in another Japanese source 青木茂 ドイツ第3帝国軍用機ガイド German 3rd Reich Warplane Guide written by Aoki Shigeru. But its source list doesn't contain your source. Either way, I want to cancel my previous post based on 野原茂 ドイツ空軍戦闘機1935 - 1945 Luftwaffe Fighters 1935 - 1945 written by Nohara Shigeru.

fontessa

[ShindenKai]

Thanks for the video about Japanese woodworking technology. I will show one of "Tenontsugi" below. It is a technique that connects pieces of wood only with tenons without using nails without gaps. Beams and columns in Japanese temples were joined by this technique. There were/are many earthquakes in Japan, but almost none of the temples collapsed due to the earthquake. The 法隆寺五重塔 Horyuji Temple Five-storied Pagoda with thick central pillar, 33m high and weighing 1,200 tons, built in AD603, is still intact. It is such a wonderful thing that we can be proud of to the world, but unfortunately, it was not directly involved in the manufacture of wooden airplanes. When I say “woodworking technology”, I mean wood board lamination technology where the adhesive was the key. Japan was unable to make a suitable adhesive, and the prototype of wooden fighter Ki-106 suffered from delamination of the wooden board during test flight. Japan, which saw wooden airplanes only as an alternative to aluminum, fell far short of De Havilland, which was serious about it. Another example where adhesive was key... Luftwaffe paid attention to the superiority of Mosquito and ordered Heinkel to develop a wooden night fighter. The Ta-154 was the answer. As we can see from the model name "Ta", it was designed by the genius Kurt Tank. It was a powerful night fighter with front wheels, two seats and 20mm and 30mm cannons similar to the He-219 Uhu. But the adhesive killed it. The adhesive oxidized and corroded the joints, causing the three prototypes to break down during the test flights, and development was discontinued. In this way, it was not easy to develop a wooden airplane with "Hastily acquired".
fontessa

Thats a very interesting wood joint, almost looks like two fists clasped together. Very clever. Thank you for the images and information.

Yes, the glue used is just as important as the wood itself. I keep hoping that more images of the Ki-106 will emerge, in its raw wood form. -The US did capture at least one...I wonder what happened to it...

[fontessa]

I keep hoping that more images of the Ki-106 will emerge, in its raw wood form.

Merry Christmas and a Happy New Year to you .

王子製紙江別工場 OJI PAPER CO., LTD. Ebetsu factory produced Ki-106. Prior to that, a prototype was made at 北海道工業試験場 Hokkaido Industrial Research Institute. Half of the main wing and a wooden fuel drop tank are exhibited at the Hokkaido Museum (Sapporo) along with a photograph of the production scene at that time. Three Ki-106s were completed by the end of the war, and two were nearing completion, but all but Prototype No. 3 were destroyed. Prototype No. 3 seems that one of them took off from Ebetsu Airfield on August 20th. ← Wore US military markings? And your last photo shows Prototype No. 4?

fontessa