you will need two chain plates not one. using two will allow the top one to rotate forward out of the way when you tighten the jib halyard. the aussie rig seems to work best for this purpose. mast rake is subject to a lot of variables such as wind conditions and crew weight. but a rule of thumb is a little less than that which will allow you to go block to block with your main blocks. hope this helps also find some A fleeter in your local hobie fleet, for the most part they are extremely helpful and willing to assist you.<br><br>