Well the XB-70 was a class above the B58,
but the Ruskies may have had something
better.

Ken

What a/c are you referring to? The Tu-128 Fiddler interceptor or the
Tu-22 Blinder bomber (both based on the failed Tu-98 Backfin)?

Tysbin had its own design based on the NM-1- the RSR:

http://vif2ne.ru/nvi/stuff/Bask/mode...ybin_rsr_2.jpg

Rob