https://tangvald.wordpress.com/2013/12/03/planform-efficiency-and-effective-aspect-ratio/https://tangvald.files.wordpress.com/2013/12/soling-jib.jpgSoling jibThe foot of the jib is in close contact with foredeck, effectively eliminating one of the airfoil tips.https://tangvald.files.wordpress.com/2013/11/straight-quarter-chord-line-elliptical-are-distribution2.jpgstraight quarter chord line elliptical are distributionElliptical area distribution with straigthened trailing edge to form vortex shedding tip cornerhttps://tangvald.files.wordpress.com/2013/11/stars-stripes-88.jpgStars & Stripes 88The 1988 US catamaran Stars and Stripes with a vortex shedding tip planform designed by Burt Rutan. https://tangvald.files.wordpress.com/2013/11/backward-cleat-hitch-2.jpgbackward cleat hitch 2Hopeless!https://tangvald.files.wordpress.com/2013/11/elliptical-planform-moded-tip-4.jpgcmoded tip 4Modified tip but retaining elliptical area ditributionhttps://tangvald.files.wordpress.com/2013/11/modified-quartec-chord-vortex-shedding-tip.jpgmodified quartec chord vortex shedding tiphttps://tangvald.files.wordpress.com/2013/11/170px-spitfire_mark19_ps853_planform_arp.jpgSpitfireThe famous elliptical wings of the spitfirehttps://tangvald.files.wordpress.com/2013/11/lift-distribution.gifLift distributionLift distribution along span of foils with varying taper ratios.2014-01-10T01:58:21+00:00monthlyhttps://tangvald.wordpress.com/2014/01/04/escape-from-club-elite-with-gushing-leaks/https://tangvald.files.wordpress.com/2014/01/oasis-galley-cor-breads.jpgOasis's galleyMy wife making us some corn bread.https://tangvald.files.wordpress.com/2014/01/gaston-bosun-chair.jpgGaston up the mastHauling an excessively chatty child up the mast keeps him otherwise amused for a little while.https://tangvald.files.wordpress.com/2013/12/dietrich.jpgDietrichDietrich in his magical mystery lairhttps://tangvald.files.wordpress.com/2013/12/bounty.jpgSANYO DIGITAL CAMERAhttps://tangvald.files.wordpress.com/2013/12/060212-007.jpgDeteriorated butt seam plankThe end of the plank at the butt seam was not looking good.https://tangvald.files.wordpress.com/2013/12/leaving-st-john.jpgLeaving St JohnLeaving St John https://tangvald.files.wordpress.com/2013/12/060212-026.jpgOasis heeled by boomOasis heeled over with weights attached to the boom end.2014-01-10T01:44:50+00:00monthlyhttps://tangvald.wordpress.com/2013/12/12/the-island-of-love/https://tangvald.files.wordpress.com/2014/01/christina.jpgChristinaChristinahttps://tangvald.files.wordpress.com/2013/12/100112-056.jpgFoxy shelvesChristina sitting on one of the shelveshttps://tangvald.files.wordpress.com/2013/12/buenadaga.jpgBuenadaga single handedMe racing the "BuenaDaga" in the single handed Foxy's wooden boat regatta. That year i won the event.https://tangvald.files.wordpress.com/2013/12/300611-059.jpg300611 059https://tangvald.files.wordpress.com/2013/12/300611-060.jpgFoxy's wooden boat raceUnfortunately i was too broke at the time to be able to afford the beautiful pictures taken.https://tangvald.files.wordpress.com/2013/12/300611-066.jpgHiking outChristina hiking out on the Buenadaga2014-01-10T01:35:04+00:00monthlyhttps://tangvald.wordpress.com/2014/01/08/glimpse-at-brazilian-workboats/https://tangvald.files.wordpress.com/2014/01/2008-01-vendaval-52-b.jpg2008.01.VENDAVAL (52) bO Saveiro Vendavalhttps://tangvald.files.wordpress.com/2014/01/pc3a9-do-mastro-vendaval.jpgpé do mastro vendavalMast step; no messing around.https://tangvald.files.wordpress.com/2014/01/bateira-galinhos-1.jpgBATEIRA GALINHOS (1)2014-01-10T01:27:01+00:00monthlyhttps://tangvald.wordpress.com/2013/12/20/the-revenge-of-the-sail/https://tangvald.files.wordpress.com/2013/12/c3a8-da-vida-venda.jpgè da vida vendaO "È da Vida" na venda.https://tangvald.files.wordpress.com/2013/12/saveiro_2.jpgsaveiro_2Saveiros in Bahía.https://tangvald.files.wordpress.com/2013/12/v5-gaff-cutter-sailplan-greenheart.jpgV5 gaff cutter sailplan greenheartProposed project greenheart design.https://tangvald.files.wordpress.com/2013/12/8.jpgCargo schoonerPreliminary croquis of the 20 M fruit schooner. https://tangvald.files.wordpress.com/2013/12/gaias-dream.jpggaias dreamGaia's dream, a modern cargo proahttps://tangvald.files.wordpress.com/2013/12/ceres.jpgCeresCeres about to unload its cargo.https://tangvald.files.wordpress.com/2013/12/tres-hombres-2.jpgtres hombres 2Notice the conspicuously absent propellor!2014-01-05T01:34:24+00:00monthlyhttps://tangvald.wordpress.com/2013/11/13/new-haste/https://tangvald.files.wordpress.com/2013/12/oasis-salinas.pngOasis in SalinasRafted to a boat i remade a rudder for in Salinas.https://tangvald.files.wordpress.com/2013/11/salinas1.jpgSalinas gaff rigSailing out of Salinas with the new rig.https://tangvald.files.wordpress.com/2013/11/250311-010.jpgScow dinghyScow-barge type of dinghy.2013-12-09T23:47:40+00:00monthlyhttps://tangvald.wordpress.com/2013/09/25/the-great-paradigm-shift/https://tangvald.files.wordpress.com/2013/09/wake-monster.jpgwake monsterhttps://tangvald.files.wordpress.com/2013/09/chart-5-27-08-t.gifOil production vs priceOil production vs pricehttps://tangvald.files.wordpress.com/2013/09/rate-pop-growth-vs-per-capita-oil.jpgrate pop growth vs per capita oilhttps://tangvald.files.wordpress.com/2013/09/planet-finite-diameter.jpgplanet finite diameter2013-12-06T23:57:34+00:00monthlyhttps://tangvald.wordpress.com/2013/11/27/lazy-lezzies-and-slippy-fishies/https://tangvald.files.wordpress.com/2013/11/la-titana.jpgLa Titana, puerto rican fishing boatA typical present day Puerto Rican fishing boat.2013-12-04T23:39:01+00:00monthlyhttps://tangvald.wordpress.com/2013/11/22/to-knot-or-not-to-knot/https://tangvald.files.wordpress.com/2013/11/upside-down-cleat-hitch.jpgupside down cleat hitchhttps://tangvald.files.wordpress.com/2013/11/polite-bollard-technique.jpgpolite bollard techniqueCorrect multiple lines to the same bollardhttps://tangvald.files.wordpress.com/2013/11/13-correct-side-cleat.jpg13 correct side cleatThe correct side is first wrap around the far side to the load.https://tangvald.files.wordpress.com/2013/11/12-wrong-side-cleat.jpg12 wrong side cleatThe wrong side of the cleathttps://tangvald.files.wordpress.com/2013/11/11-approach-cleat.jpg11 approach cleatFrom the load to the cleathttps://tangvald.files.wordpress.com/2013/11/if-dont-know-tie-a-lot.jpgif dont know tie a lotIf you don't know how to tie a knot, tie a lot!https://tangvald.files.wordpress.com/2013/11/two-round-turns-and-a-clove-hitch-on-cleat.jpgtwo round turns and a clove hitch on cleatTwo round turns and a clove hitch on cleathttps://tangvald.files.wordpress.com/2013/11/bowline-on-cleat.jpgbowline on cleatBowline on cleat cannot be slipped up and offhttps://tangvald.files.wordpress.com/2013/11/6-cleat.jpgfinishing the cleat hitchFinishing off with one half hitch.https://tangvald.files.wordpress.com/2013/11/5-cleat.jpgtying more to cleatSome figure eights..2014-01-04T14:45:09+00:00monthlyhttps://tangvald.wordpress.com/2013/11/01/boat-makeover/https://tangvald.files.wordpress.com/2013/11/agosto-2011-004.jpgMast bootThe finished boothttps://tangvald.files.wordpress.com/2013/11/100_0259.jpgRe-cutting the mainsailA covered basketball court made an ideal place to work on the sails. All edges and corners were preserved and re-attached in their new positions saving an immense amount of work and money.https://tangvald.files.wordpress.com/2013/11/100_0249.jpgNew shape essayRaising the sail folded along the cut lines and viewing from afar allowed to double check that the measurements i had determined on the drawing board would indeed be correct.https://tangvald.files.wordpress.com/2013/11/oasis-mast-down-sandwich.jpgOasis mast down Oasis with mast down. <br /> on one side a boat i was doing work on, on the other a boat i was lookin after and where we also temporarily lived.https://tangvald.files.wordpress.com/2013/11/toria-fashion-show-in-electroshock-096.jpgSupper after workChristina makes us supper in the neighbour's boat.https://tangvald.files.wordpress.com/2013/11/060611-007.jpgMast end plug finishedBlends right in!https://tangvald.files.wordpress.com/2013/11/250411-003.jpgMast end plugRoughly shaped and fitted ready to be glued in place.https://tangvald.files.wordpress.com/2013/11/250411-015.jpgMast end plugBuilding up the plug for the mast end.https://tangvald.files.wordpress.com/2013/11/dscf7568.jpgMast end plug shapedShaped and sealed.https://tangvald.files.wordpress.com/2013/11/dscf7556.jpgMast end plug in placeThe first step will taxe the peak halyard. The sheave slot will be for the topsail halyard. the topmost step is for the spinnaker halyard.2013-11-10T14:31:21+00:00monthlyhttps://tangvald.wordpress.com/2013/11/09/induced-drag/https://tangvald.files.wordpress.com/2013/11/56.jpgRectangular vortex Rectangular vortex https://tangvald.files.wordpress.com/2013/11/downwash-and-tip-vortex-section-gif.gifdownwash and tip vortex section gifStationary smoke wall shows the tip vortices as well as the downwash created by the passage of a lifting foil.https://tangvald.files.wordpress.com/2013/11/800px-aircraft_wing_lift_distribution_showing_trailing_vortices_3-svg.pnglift distribution showing trailing vorticesLift distrubution and trailing vorticeshttps://tangvald.files.wordpress.com/2013/11/400px-induce_drag_downwash.pngInduced downwash effect on lift vectorDownwash induced by the tip vortices negatively affect the orientation of the lift vector.https://tangvald.files.wordpress.com/2013/11/220px-tip_vortex_rollup.pngTip VortexTip vortex streamlineshttps://tangvald.files.wordpress.com/2013/11/771px-euler_tip_vortex.png771px-Euler_tip_vortex2013-11-09T18:49:23+00:00monthlyhttps://tangvald.wordpress.com/2013/10/23/how-is-lift-made/https://tangvald.files.wordpress.com/2013/10/karman_trefftz.gifKarman_trefftzhttps://tangvald.files.wordpress.com/2013/10/dscf6273.jpgDSCF6273https://tangvald.files.wordpress.com/2013/10/dscf6269.jpgDSCF6269https://tangvald.files.wordpress.com/2013/10/pressure-distribution.jpgpressure distributionhttps://tangvald.files.wordpress.com/2013/10/flow-upper-and-lower-wing.gifFlow upper and lower winghttps://tangvald.files.wordpress.com/2013/10/downwash-wake.jpgdownwash wake2013-11-09T16:40:52+00:00monthlyhttps://tangvald.wordpress.com/2013/10/09/scaling-laws-2/2013-10-22T00:40:12+00:00monthlyhttps://tangvald.wordpress.com/2013/10/16/sailing-to-be-made-over/2013-10-17T02:43:28+00:00monthlyhttps://tangvald.wordpress.com/2013/08/29/the-puertorican-nativo/2014-01-08T03:11:34+00:00monthlyhttps://tangvald.wordpress.com/2013/10/02/finding-the-oasis-2/https://tangvald.files.wordpress.com/2013/10/15347.jpgOasis and Jonny Depp in San JuanOasis and Jonny Depp in San Juanhttps://tangvald.files.wordpress.com/2013/10/12510.jpg12510https://tangvald.files.wordpress.com/2013/10/11639.jpg116392013-10-03T14:58:38+00:00monthlyhttps://tangvald.wordpress.com/2013/09/18/a-kid-on-a-boat/https://tangvald.files.wordpress.com/2013/09/artemis-drawing-cropped.jpgArtemis drawing cropped2013-10-06T19:57:05+00:00monthlyhttps://tangvald.wordpress.com/2013/09/11/why-my-boat-does-not-have-a-motor/https://tangvald.files.wordpress.com/2013/09/bottom-paint-oasis-014.jpgOasis on the hardA bottom completely free of extraneous items.https://tangvald.files.wordpress.com/2013/09/elf-full-canvas.pngelf full canvasThe "Elf" all sail set.https://tangvald.files.wordpress.com/2013/09/789px-centennial_regatta_sydney.jpgCentennial_Regatta,_SydneyThese boats all have enough sail to not have a problem in light wind.2013-09-16T17:48:18+00:00monthlyhttps://tangvald.wordpress.com/2013/09/05/how-i-learnt-to-sail/https://tangvald.files.wordpress.com/2013/09/030913-011.jpg030913 011https://tangvald.files.wordpress.com/2013/09/030913-008.jpg030913 0082013-09-05T18:25:00+00:00monthlyhttps://tangvald.wordpress.com/2013/08/23/so-where-are-you-from/https://tangvald.files.wordpress.com/2013/08/ydia-207.jpgydia 207https://tangvald.files.wordpress.com/2013/08/ydia-211.jpgydia 211https://tangvald.files.wordpress.com/2013/08/ydia-108.jpgydia 1082013-09-03T23:25:12+00:00monthlyhttps://tangvald.wordpress.com/about/2013-08-23T17:35:47+00:00weekly0.6https://tangvald.wordpress.comdaily1.02014-01-10T01:58:21+00:00