Hopefully some one can help:
I am looking for a graphic or photos showing cavitation using a greenland paddle. I saw some images that showed how a cant would prevent cavitation and the two pictures or graphics (can’t quite remember what they were) showed it very well.
I am also looking for a map showing the migration of the Dorsett and Thule cultures from western Canada through the Arctic to Greenland. I remember seeing an animation which showed the migratory patterns but haven’t been able to find it.
so I am reaching out to the vast knowledge base of my fellow pnetters. Can anyone help?
Ventilation
Well, I’m sure you mean ventilation (drawing air down from the surface during the stroke) rather than cavitation (creation of vapor bubbles due to very high-speed flow around a sharp edge). Anyway, I’d like to see those graphics too, if they show up. I’ll look around in the mean time…
yes I do mean ventilation
However, 99.9% of the time I discuss this with people the word cavitation comes up so I fell into the same mold. apologies.
Paul
ventilation
Actually since the stroke is fairly short duration is the only reason most paddles don’t ventilate. Ventilation is a common problem with water piercing foils, which a paddle is. Luckily for us, it takes a little while to form and by then the stroke is over 
I suspect what you’re talking about is neither cavitiation nor ventilation, it’s pushing air down into the water with the blade when the stroke begins. More common with thick squared tips on some wood paddles, ie: GP’s.
Bill H.
your wish is my command
Cavitation
http://cav.safl.umn.edu/images/slideshow/image1.jpg
Migration
http://www.nunatsiaqonline.ca/pub/photos/migration_map_570.jpg
