Your combined crew weight should be about 120-140 kg, if you're a skipper you should be a little lighter than your crew.
sail
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A 29er is basically a MTB built around the same rim size as a 28"(622 mm) road bike - the common size for adult bikes.
No a boat or sail license is not required if human or sail powered.
A bentinck sail is a triangular shaped main course with a single clew at the foot of the sail. The sheet is made down to the centreline of the vessel. Occasionally the sail would have a short foot spread with a short boom called a Bentinck boom but still with a single sheet. The the sail gave advantages in heavy weather, obviating the need to raise tacks and sheets when going about and enabling a good view of most of the vessel from aft when manoeuvring. NG
Wind!
Yes it should. I've been running 700c tires on my modern 29er wheels without a problem. You could also try looking for 1.5 inch 29er tires.
no the resistansts on the sail make a rentical drift also the mentaro is to heavy
Speaking as a current student attending Full Sail University, you need two letters of recommendation.
a force in the air pushing a sail to move a boat also know as wind
China doesn't need to sail to Southeast Asia. It's already there.
None.