ORIGINAL: Local Yokel
Think I've seen part of this footage before, but thanks for posting! I understand that the autogiro's neglible payload precluded its use as an ASW platform.
At 1.03 into the footage there's a brief view of a Japanese equivalent to the Slingsby Grasshopper primary glider - footage of one in flight here, 2.04 in. Basically you are in flight sitting on a girder 3 inches wide, so the sense of exposure is substantial. Launch is by means of a Y-shaped bungee cord, pulled by members of the team. I have fond memories of this little aeroplane: I once routed the cadet force band when I overshot my intended landing area!
Actually, I have seen the Ka-1 accredited with sinking 1 submarine, apparantly they were used for shore based coastal ASW. Be interesting if someone can confirm that.
Wiki says: "There are some information that suggests that the autogyros were responsible for at least one sunken submarine. "
i've never heard of a US sub being sunk by one... nor a Brit... so unless it was a Russian, or Dutch one (again - i've reviewed Dutch subs, and i've never seen anything about it...), i doubt the claim... i suppose the IJA could have accidentally sunk a IJ sub by mistake (but i haven't heard of this, either.)
It could be some very recent information, however, that hasn't been widely released...