Do raked wingtips reduce drag of a hang glider?
The main effect of the ranked wingtips is not improving the glider performance but change handling characteristics during thermaling. Such wing tip changes the stall pattern of the inboard wing during the circling in a thermal. They are optional.
Pros:

Whit this wingtip installed, you should be able to climb better in weaker thermal. Due to a change in the wing stall pattern and bigger area.
Glider should have a higher glide ratio at a lower speed. Thanks to the higher aspect ratio. See. this answer https://aviation.stackexchange.com/a/8797/54674

Cons:

Such wing tips adversely affect roll rate. Especially if you need to quickly change your bank angle in &quot;wild thermals&quot;.

In theory, they should decrease your glide performance characteristics in high sped flight.


It is always a pilot choice. Glider looks much better with them ;)