Recent content by rower

This work evolved rowing a high drag dinghy with many prototype oars some which are shown above. Changing planforms over time inadvertently lead to less area and structural considerations accidentally lead to vibration. Lesser drag kayak was chosen as a comparison since dinghy might be unique...

3 different blades (photo 8) propelling the same kayak over same distance in the same time (30+/-1 seconds). If forces are generated by lift, drag or some combination area should count? More info at...

Sorry no flat water or measurements, work evolved rowing prototypes based on dubious theory but consistently showed performance could be maintained with large reduction of area. Any possible explanation?

That is a very elegant design but I am still working with rough developmental prototypes. Section 7H2 Fig7 is elliptical, blade cut and welded from 13/8" fence pipe acting as shaft, crude but demonstrates potential of small area blades. This somewhat elliptical section did not vibrate, larger 7G...

These blades have a rotating horizontal path away from the boat (outboard edge leading) and toward the boat where center line shaft would interfere with inbound leading edge. This is well explained in Chris Pulman's paper, link in starting text. Blade path in my diagrams is vertical and, if...

Blade is in line and centered along shaft. Blade sections in Fig 7 have descriptions of actions. Vibrations could be Karman street vortex. After entry blade runs deep and even with vibration never disturbs the surface until exit. With width of blade and diameter of shaft being equal, there is...

Could there be increased lift with more sideways travel of vibration? Found less performance when thin oar blades are feathered. Now row with no rotation and blades fixed perpendicular to water surface. Blade still fallows a good trajectory and is small enough for little need of feathering on...

Blades in Photo 6 and Fig 7 can be mismatched as pairs and the boat rowed straight (video 1) indicating some parity with variations at startup, braking, and with/without flow induced vibration (FIV). Fig 2 and 16 show likely blade travel (based on repeat observations). On entry FIV blade is a...