UIUC Airfoil Coordinates Database (Reference)
Last update 12/15/95
S7055 (10.5%) for R/C Soaring
Newcomers and casuals pilot favor simplicity, which among other things
leads to the choice of a flat-bottomed airfoil. Unfortunately, the
selection of advanced flat-bottomed airfoils is limited; put bluntly, no
recent flat-bottomed airfoils have been designed with a view toward
reducing the drag owing to laminar separation bubbles. The idea to do
something about this situation began during a discussion with Tim Renaud of
Airtronics. He said that what is needed is an aft-flat-bottomed airfoil
for thermal soaring. The airfoil he thought should be 10-11% thick and
should not build up speed as quickly as the S3021 or E205 (which are both
nearly flat-bottomed). As a result of this discussion, the S7055 was
designed to fill this niche.