-- Last Updated: Jun-13-13 11:25 AM EST --
I would follow Bob's advice. Personally I find an angle of about 12 degrees off horizontal works best for me, but it also depends somewhat on your femur length and how high the seat is off the hull floor. You might also choose a lesser angle if you plan to sit occasionally.
I would get the longest set of hangers and hardware you can. You are often limited to 6" long bolts if you go with stainless steel machine screws (#10 x 24 tpi or #10 x 32 tpi). If you need longer because of thick gunwales and/or a thick seat frame you might need to go with stainless steel carriage bolts.
Determine how high the front seat frame needs to be to provide heel clearance for your feet while wearing your largest intended foot wear. Cut the front of the hanger so as to place the front seat frame at that height, then cut the rear of the hanger a bit shorter and shorten as necessary. Once you get the angle to suit, if you want the whole seat higher, it is easy to shorten up the front and back of both hangers a bit.
URCHIN Portable Anchor
2-3 Canoe/Kayak Trailer
Kayak Motor Kit
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