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[quote=spfx]Wow 
So many things to consider for this event.  I'd stay away from a peddle prop solution.  Propeller propulsion requires so many critical considerations to do it right you'd need an engineer.  Paddling seems like a much easier and perhaps more efficient solution anyway.  The issue of one person motivating the boat while the other rests may not be better than two working together.  Consider the dead weight the resting party becomes.  
What is the probability that both of you work together until enough wind comes along when one can rest?  Beach cats need only the slightest winds to far outpace any rowing/peddling effort.  If you both row together, can you set up a sculling arrangement taking advantage of leg, back and arm muscles thus spreading out the work load and again decreasing the amount of dead weight just using legs would do?

I thought the power required to move a boat through the water was by the square of its speed, but recently heard its by the cube!  The lesson here is reduce weight as much as possible and lower wetted area and induced drag.  Keeping the transoms out of the water as much as possible may be a big help.  On my recent trip to Catalina I noticed the added gear weight of 130-150 lbs sinking the transoms more than I expected.  Find a way to secure gear forward of the crossbar.

Consider a Prindle 19 for your adventure.  I keep mine next to a Hobie Miracle 20 and the P19 is actually a little longer and possibly lighter?  For whatever rowing/peddling setup you decide it has rotating centerboards which may stay out of the way more.  I bought mine for $2500 in decent condition and it came with a spin.  You could fashion a pole from a 2" thin wall aluminum tube similar to mine without the unnecessary extras keeping cost down.  https://www.youtube.com/watch?v=07EA0r3vpNo[/quote]

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