Yeah, I wondered about that short luffed spi for a while now. Only just did I realize why it is so short. It has to do with how the spi is carried without a spinnaker pole. They have a bridle of wires to keep the spi tack forward. However these will move back and forth under different sheet loads if they are not supported by other means as well. And here comes the trick. The spi tack bridle is ALSO support vertically by a line coming of the forestay. Now this means the whole spinnaker needs to stay below the hound fitting or the top will just wrap itself around the forestay after a gybe.

Nice simple setup but does limit the spi area and luff length considerably. No wonder they only have 10 sq. mtr. of it.

Thanks guys, I learned someting new today !

Wouter