A slow dinghy with oarlocks fixed to gunwales has a different blade motion geometry than a fast racing shell with outriggers, FIG 1, 2. FIG 1...
[ATTACH] [ATTACH] [ATTACH] [ATTACH] [ATTACH] [ATTACH] The amount of research on competitive rowing is overwhelming but little is applicable to...
Questions after reading https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20160003578.pdf Could a taller but progressively lighter and...
Tying in excess sail fabric in slab reefing is most effective at last outboard reef point, yet is the most difficult to reach and often left...
The system: DIY servo pendulum with variable vane to pendulum linkage, this has not been tested by ocean crossings or extreme weather, but has...
Could some gains made upwind in gusty and choppy conditions be from "extracting energy from atmospheric turbulence"...
Having trouble putting a leading edge vortex on a forward surface to improve upwind performance of a vortex driven low aspect sweptback rig....
Is lift possible without downwash?
The flow pattern in drawing 1 and at 20* -30* angle of attack (AOA) in videos http://www.youtube.com/watch?v=z91al4uBm9g consistently appears...
http://users.acsol.net/~nmasters/vortex-lift/stall.html shows possibility of sustainable high lift at high AoA. Can this be used in soft sail...
The "crab claw" or, at least the leading edge vortex rigs I have sailed, seem to have good offwind potential at the cost of upwind performance...
These are observations of repeated sailings in various conditions, occassionally matched against a Zuma ( approx same SA, OAL, weight ) of...
If upward flow on tapered sail plan and/or sweepback of mast bend produces more loading on less area resulting in strong tip vortex, would forward...
Where to bend the wind? maximum bend perpendicular to course, see drawings. A is not perpendicular but bend facing forward, typically achieved...
Rather high flow speeds in attachment but any lessons for sailing here? http://www.rollinghillresearch.com/A...ptiveBlade.pdf....
Searching soft wing sails brings up many designs, from simple, www.wingsails.com, to the complex, www.omerwingsail.com, and close to mine,...
Sail design at http://www.boatdesign.net/forums/boat-design/sail-design-trim-camber-twist-leading-edge-23524.html has been built as in attached...
Good text on sail dynamics,quite readable even for the aerodynamically challanged at...
Downhaul, vang, mastbend, leech and tip cables control camber. Tip sheet controls twist off. Mast rotation controls leading edge section. See...
I have often observed non-flapping flight of gulls trailing a ferry boat, positioned to feed on stunned marine life in wake. Assumed ferry's...