Kite to pull ship across Atlantic (photo update)
Photo update to this article

Photo © Reuters/Scanpix
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Labels: kite, pictures, pictures-other
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The spirit of the wind lives here. This is a place where individuals from all walks of life, and all parts of the world, join together to celebrate their passion for sailing on snow or ice. There are no restrictions or judgments - only enthusiasm and accommodation.
Photo update to this article




Labels: kite, pictures, pictures-other

It's kind of back to the future
Verena Frank, Beluga Shipping
HOW THE KITE SHIP WORKS
- The kite sail will help reduce annual fuel costs by 10-35%. Reduced fuel also means fewer harmful carbon emissions
- The large towing kite resembles a paraglider and is shaped like an aircraft wing, to enable it to take advantage of different wind directions
- It operates at 100-300m above surface level - much higher than a normal sailing craft - where winds are stronger and more stable
- The kite can be used in winds of between 12-74km/h (7-40 knots) and not just when the wind is blowing directly from behind the ship
Labels: energy, kite, pictures, pictures-other
by William Tuthill



Labels: pictures-other
Subject: WISSA 2008





Labels: 2008, pictures, pictures-other, wissa


Labels: pictures, pictures-kites, pictures-other

Labels: azov, ice sailing, kite, ob, pictures, pictures-other, rustler


By Barney Kenney
I am currently trying out a new method for making skis. If it works well and is economic, I may try selling a few. My preference is still to license the technology.
I was out at Spray again yesterday in strong gusty winds. Conditions were slushy because there was a snow/rain fall the night before. Normally the surface is fast and dry. Here's some of the physics.
The +15 C is produced by Chinook winds during the day. Westerly flow of warm moist Pacific air is forced upslope on the west side of the Rockies which causes rain and releases latent heat to the air. The downslope flow on the east side is therefore hotter and drier than at the same altitude on the west side. Often much hotter and drier.
Melt water produced by the warm dry wind either evaporates immediately or drains vertically along the candle boundaries and keeps the surface dry. (It is this vertical drainage that actually causes the ice to candle). Best time of year for ice sailing!
When it is clear, stability produced by back radiation decouples the surface from the westerly flow aloft at night. The surface wind stops and the temperature falls to below zero overnight. This helps to tighten everything up.
There is still a danger factor, however, because the ice sheet may be eroding from below by heat transported by baroclinic currents and stream inflows; the later you sail into spring, the more care is required.
It helps to know what you're doing, what to look for, and where not to go. We carry ice picks and drill test holes daily. It also helps if you have a board that can sail on water. Even then, one occasionally gets wet - but that's another story.
Labels: chinook, pictures-other, spray