Xfoil is a really wonderful "numerical wind tunnel", for low Reynolds airfoil conception use. I designed some airfoils, that are here presented, with the ideas that lead the conception for each one.
   They are sorted according to the date they were created. The last column indicates that some airfoils were designed together, and are linked by a common cell.

Name :

   Airfoils names does mean something, here are some keys for judging an airfoil at first glance. This is a quite common way to name an airfoil. "MS" stands for Matthieu Scherrer, my name

For description of main use :

either :
• The letter from FAI rules :
  • i for F3i
  • b for F3b
  • f for F3f
  • ...
• GP for scale sailplanes ("Grande Plume" in french).
• FW for Flying Wings.

MS1,9/8,7i

Design ideas :      See : Jade project Coordinnates :      MS1,9/8,7i.dat, MS1,9/8,7i.gif Drag polars : Full study : fixed Re polars, variable Re, effect of flaps over the polars. 3D polars, according to Reynolds. Effect of flaps, Re*Cl^.5=110000. Polar and optimal flap deflection, , Re*Cl^.5=110000. Comparison to HQ2/09 (MS in red), Re*Cl^.5=110000

top

MS2/9,5i

Design ideas :      See : Jade project Coordinnates :       MS2/9,5i.dat MS2/9,5i.gif Drag polars :            Full study : fixed Re polars, variable Re, effect of flaps over the polars.

top

MS3,3/15GP

Design ideas :       This series of airfoil is the result of reflexions made with JL Michot. He wanted to build a large scale SB10, about 6m span. This is a high AR planform, and root chord is only 200mm. Therefore really small Reynolds number in sight...    For the root, we then need thickness for an efficient spar, but also a good behavior with small the Reynolds. The HQ3/15 was used as a basis, with in particular the Reynolds issue to be improved. Coordinnates :       MS3,3/15GP.dat MS3,3/15GP.gif Drag polars :            Variable Re=150000 (corresponding to SB10 root : chord=200mm, Wload=65g/dm˛).

top

MS3,3/11GP

Design ideas :       This series of airfoil is the result of reflexions made with JL Michot. He wanted to build a large scale SB10, about 6m span. This is a high AR planform, and root chord is only 200mm. Therefore really small Reynolds number in sight...    We also needed a profile for the remainder of the wing, less thickand willing to put up with decreasing Reynolds number along the span. Simply an homotethical airfoil is appropriate, here is the same one with 11% thickness. It makes a great progress compared to the HQ. Coordinnates :       MS3,3/11GP.dat MS3,3/11GP.gif Drag polars :            Comparing with MS3,3/11GPT Re=150000.      Variable Re=125000 (corresponding to SB10 intermediate : chord=170mm, Wload=65g/dm˛).

top

MS3,3/11GPT

Design ideas :       This series of airfoil is the result of reflexions made with JL Michot. He wanted to build a large scale SB10, about 6m span. This is a high AR planform, and root chord is only 200mm. Therefore really small Reynolds number in sight...     The profile was modified for better fitting at tip : higher Czmax, and less momentum created. This is quite appreciable on a wing with very great AR, that prevents a bit risks of fluttering. You have to pay it with a slightly higher drag. Coordinnates :       MS3,3/11GPT.dat MS3,3/11GPT.gif Drag polars :            Comparing with MS3,3/11GP Re=100000.      Variable Re=75000 (corresponding to SB10 tip : chord=100mm, Wload=65g/dm˛).

top

top

Pour me contacter ...