Share 'Particularities of Ontong Java's catamaran (?) of Hans Klaar'

Hello. Ontong Java certainly is no a Wharram, but, James Wharram expressly welcome him and is friendly with the design, etc. My question is if anyone knows why the hulls have different length?  And moreover, if such circumstance benefits in any manner the sailing ability. I also see that the mast and the foresail are placed not in the middle but more close the the longer hull. Thanks.