We used to have the mossie set up quite dfferently for cat rigged as opposed to sloop rigged, Has any one thought of setting a mossie up just for cat rigged sailing? They could tailor the spinnaker specifically for that purpose ie they do not require as much sail area to be able to generate the power that is necessary for "two" up sailing, and if they used a slightly smaller and flatter spinnaker it may give them more control and enable them to actually put more "speed" into the water