My statement that an experienced paddler can consistently exceed "top speed" as dictated by hull length was in error -- What I meant to say was that an experienced paddler can consistently exceed "Hull Speed" as defined by hull length. All the references I have read define "Hull Speed" as...
Skilled kayak paddlers consistently exceed "Top speed" as determined by hull length. "Top speed" of displacement hulls is defined as a function of length because as speed increases it will reach a point where rear of hull starts dropping into trough (lower water level) between bow and stern...
As a retired ME I have developed a hobby of designing and building small paddle powered boats -- not really kayaks but also not really canoes. I have felt the aft sinkage performance during each stroke to be a significant engineering challenge. And I and have found at least one significant...
It appears to me that you are doing everything possible to escape my question --
First off, I believe most racing kayaks are around 16-18 ft, well below the 20ft range so speeds you quote would be well above hull speed.
Second, YouTube videos clearly show aft sinkage during each paddle stroke...
My question specifically referenced videos of racing canoes and racing kayaks. Racing canoe aft sinkage is less evident because the relatively large freeboard above water surface tends to hide the effect (deep hulls to help avoid swamping the open cockpit). Racing kayak videos clearly show...
Videos of racing canoes/kayaks show some submersion or greater draft of aft area during each paddle stroke. If we disregard entry and exit and assume power is applied straight back in direction parallel to water surface at a point perhaps 2ft below water surface please explain how and why this...
Thanks for the reply. I had trouble with Bernoulli effects when in college and now find myself in the same kind of trouble. I understand how a static head in a converging pipe can yield a reduced pressure at (or at least after) the restricted outlet where fluid flow out. But I don't grasp how if...
Fluid or sleeve bearings use an off center shaft location to generate a hydrodynamic wedge in direction of rotation. This converging fluid causes higher pressure and can support a load applied normal to shaft axis during rotation. This action appears to be similar to the hydrodynamic support of...