RE: [Paddlewise] skeg ups

On Oct 18, 22:00, "Robert Woodard" wrote:
} Subject: RE: [Paddlewise] skeg ups
> Dave K wrote:
> 
> > Any airfoil which moves through any fluid, be it air or water,
> > will generate
> > "lift" if it has a positive angle of attack (ignoring stalling,
> > to simplify
> > things).
> 
> Ok, I understand that part, but how does a skeg get applied at a positive
> angle? Doesn't it run in line with the keel (and direction of travel)? I can
> understand the rudder producing lift, as it can be turned to a positive
> direction (left or right). But, a skeg I just can't seem to get through my
> head as a lift producing device.
> 
> Lateral resistance, yes. Heck, I've even observed the kayak doesn't "rock
> side-to-side" as much with the skeg deployed (uh oh hope this doesn't start
> something new).

Exactly, lateral resistance.  Lateral resistance implies that you have
some *sideways* motion to resist.  That's what causes the angle of attack
that produces the lift.  

> I've been sitting here thinking about this for a few minutes: Is the lift
> created because in the wind, your real direction is slightly different the
> where your bow is pointed? Aha! This could be the positive angle? The more
> skeg exposed, this would generate more lift. AND this would explain why my
> skeg setting at rest or slow speed is not the same needed at higher speeds
> (more speed, more lift?).

Yes, lift will vary with speed.  At a constant angle of attack (not likely)
the lift will vary as the square of the speed.



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