Well you have to also include the fact that the IJN had the
advantage of not needing to scrap nor complete outdated ww1
ships.Also they had the advantage of being able to concentrate
their naval forces in just 1 ocean unlike the brits and to some
extent the USN.
As for my opinions on the Kriegsmarine, I apologise if my
statements were not clear enough. What I mean was that had Germany
allocated more resources to U Boat in Plan Z and had more U Boats
ready on the eve of the Second World War as a result of such
allocation, then the larger submarine force might just be
sufficient to strangle Britain. I understand that Hitler ordered
the switch in priority from surface construction to U Boat in late
1939 but then perharps in retrospect, the change in policy was a
bit too late to have a decisive impact at the initlal point of the
submarine campaign when the British were at their most vulnerable
to such a campaign. Yes it is true that the Treaty of Versaille
specifically prohibited the Germans from constructing submarines
but as with other branches of the German armed forces, the Treaty
was frequently corvetly broken. German U Boat construction
expertise was maintained during the interwar years prior to the
abrogation of the Treaty by their covert involvements in the
submarine projects of friendly countries notably Finland and
Russia. A latent industrial base was also maintained for future U
Boat programs during this period of time. Hence it is not
surprising that Germany began the open buildup of its U Boat arm,
progress was rapid. I think the other battleship launched was the
Tripitz.
Yes the German sub fleet was being built during that time but
they could not put full scale production into place thus limiting
the fleet to some 2 constructions a year!!The germans did try to
build more U-boats but they had to little time.They had the best
subs in the reigon and the 2nd biggest sub fleet at the outbreak of
war....i highly doubt they could do any better then that! Also you
have to remember that the surface fleet was needed for Norway.