Originally Posted by alikair
Thanks for the reply Gannon, I did take the negative aspects of raising my seat into consideration. There is only one way to find out. well two if you count surgically adding 3 inches to my torso. BTW how well would you be able to roll if your boat was 3 inches taller on the sides and back?
Don't listen to Hojo as his radius of gyration is small while he gets shaded in class II holes
We honestly have to make a few "uncontrolable assumptions."
Adding 3 in...I assume you're talking a bigger boat. There are two issues. you will have more boat scraping the water during the roll which is actually called "skin friction." However, this fluid drag force is very minimal and you should barely be able to notice a difference. Expecting a reply from Hojo on that one!
The second: imagine standing in a pool and jumping onto an inner tube...now add 3 in to the height of the tube. Takes a little more jump. Well if you're upside down and trying to roll up (jumping upright) your going to have to add a little oomph to get yourself up as you rotate around a larger circumference. Roll a few boats and you'll notice that some feel easier than others. Well within that circumference is a volumn of water that must be displaced during the roll. Again the physics seem a little overkill. But you are using your roll technique to "exchange" from one balanced position (upside down) that displaces a certain volumn of water for another position (right side up) which should diaplace more water due to the different densities of the submerged parts (i.e., upside down = you plus little boat vs rightside up = only boat). Think of it in terms of the center of mass of you + kayak + paddle upside down vs right side up. The COM is higher relative to the surface of the water in the upright position.
WOW is that overkill! The easy test is to just adjust your seat an inch or two and try a few rolls...go to a surf hole and see how it rides. Just try out some stuff! Easy class II or III stuff...You can run safety for Hojo!