Two-seater performances compared using Carl Herold's figures:

Handicaps L/D Max

Grob Twin 1.155 35
ASK21 1.180 35
PW-6U 1.190 34
Puchacz 1.287 32
Peregrine (Krosno) 1.370 26
Ka7 1.490 26
Blanik L23 1.550 27
Scweizer 2-33 1.840 23

Quite a spread.