I have a Huki OC1 and have been using a rowing shell car top carry frame for a couple of years. Essentially, the frame mounts on top of my Yakima bars. The frame extends the contact points further fore and aft, so the OC is suspended in cradles at about the 1/3 and 2/3 point of the boat length.
It works quite well, but frankly the frame is a bit on the bulky side and certainly can't be helping my fuel economy.
I keep looking at the more streamlined Yakima and Thule kayak rigs and wonder if they would work just as well, offering less drag on my car, etc. I presume for lower speeds, urban transport the saddle set-ups would work fine on their own, and that if highway speeds are encountered, adding tie downs at nose and tail would be fine.
Any suggestions as to how one can rig their OC1 on top of their car with the least amount of frame/carry gear, but still allow for transport at highway speeds?