Quite recently a commercial glider applicant was asked to
demonstrate a slipping turn downwind to final, and do everything
including landing with no spoilers.

He did so, with the wing into the wind, but once he found himself
180 deg in the other direction, he forgot to "switch" the
slip to have the lowered wing into the wind. So it was a "bumpy"
landing with a crab.

So what is a slip? Well, a forward slip or side slip to
me is an uncordinated manuever where both wingtips
are at the same airspeed. A turning slip is when the
wingtips are at different airspeeds, and the uncoordinated
part means the low wing and the rudder are opposite (outside rudder).
If the rudder and low wing are the same, then it may be a skid.

If the ball and the low wing are the same, it's a slip, if the
ball and low wing are opposite, it's a skid.

Is that about right? Or have I missed something obvious?

In article ,
Martin Eiler wrote:
While I agree with the majority of Todd's post, it
would be beneficial to have some clarification on point
5.

T O D D P A T T I S T wrote:
5) If you slip while flying straight for very long,
you need
to lower the opposite wing or you will begin a skidding
turn. Modern gliders have a low fuselage side area
and take
a while to begin this type of skidding turn.

I know this may sound petty but considering how
this thread has evolved, it's appropriate.
Exactly what is your definition of 'flying straight'
and 'turn'? Remember what Clinton taught us about
something we thought was as simple as the word 'is'.


Apparently the consensus seems to be that there are
three types of crosswind landing techniqes used. Crab
or side slip or some combination of both. Would it
be commonly accepted to say that while using the same
spoiler setting for both a crab and a side slip crosswind
landing, that the glider side slipping will have a
higher rate of descent?

M Eiler





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Mark J. Boyd