Technology and Operations
This forum is for discussing technological & operational matters pertaining to U-boats.
Re: I might have an answer
Posted by:
Richard Uno
()
Date: April 10, 2008 02:50PM
ThomasHorton Wrote:
-------------------------------------------------------
> I think I may have found half the answer.
>
> Italy developed the W270/533.4x7.2 Velosa in 1935.
> Japan was especially interested in the design of
> the Italian W270/533.4x7.2 Velosa torpedo and
> copied some of the components.
>
> Japan was using Whitehead designs for their 21â€
> Type 43 ship launched torpedo in 1910. In October
> 1917, the Japanese Navy decided to move toward the
> 533mm/21†design for their submarines. The
> 533mm Type 92 was designed in 1934 and used
> designed from the G7a.
I tend to agree with your reasoning, except the case of Japan. The connection between the Italian Velosa and IJN Type 97 for midget subs (I guess that's what you had in mind?) is spurious at best... and same for Type 92. What you are describing was actually Type 92 Model 2, which never materialized. The same torpedo was produced as Type 92 Model 1, which first emerged as early as 1925. True, it has been alleged that it might have been based on information about WW I German torpedoes originating from Hans Techel. I have never seen any credible sources for that.
As I said, the rest of your reasoning sounds very convincing.
FWIW,
Richard
-------------------------------------------------------
> I think I may have found half the answer.
>
> Italy developed the W270/533.4x7.2 Velosa in 1935.
> Japan was especially interested in the design of
> the Italian W270/533.4x7.2 Velosa torpedo and
> copied some of the components.
>
> Japan was using Whitehead designs for their 21â€
> Type 43 ship launched torpedo in 1910. In October
> 1917, the Japanese Navy decided to move toward the
> 533mm/21†design for their submarines. The
> 533mm Type 92 was designed in 1934 and used
> designed from the G7a.
I tend to agree with your reasoning, except the case of Japan. The connection between the Italian Velosa and IJN Type 97 for midget subs (I guess that's what you had in mind?) is spurious at best... and same for Type 92. What you are describing was actually Type 92 Model 2, which never materialized. The same torpedo was produced as Type 92 Model 1, which first emerged as early as 1925. True, it has been alleged that it might have been based on information about WW I German torpedoes originating from Hans Techel. I have never seen any credible sources for that.
As I said, the rest of your reasoning sounds very convincing.
FWIW,
Richard