However, if you are looking for a glider that has very good high speed L/D, like a modern composite glider, I would recommend you go with something with less camber than the HQ 35xx series.
I can tell you that on a lightly loaded 1/3 scale model, the HQ 3515 root and HQ3512 tip airfoil sections are very good thermal soaring airfoils. I used them on my 1/3 scale Cherokee RM and I believe Dave Smith uses them on his 1/3 scale Cherokee II design. Chris Williams has used these on most of his designs with great success. Having said that, I would be inclined to go with the HQ series of airfoils. And as Mike (ARUP) said, he has used full scale sections with success. It also works well on the 1/4 scale Cherokee II that Dave Smith designed. The Go549 on the full scale Cherokee II comes to mind. Many full size airfoil sections will still work OK on a scale glider.
#Glider airfoil how to#
I must be able to translate the German text site somehow, just need to find out how to do it. I will boot up my Windoze operating system with Profili2 and run some polars on some of those coords. Phillip Kolb and Benjamin Rodax have developed some really good section for scale models If you calculate the local Reynold numbers when flying the plane at cl=1.0 (theoretically!) you will have an indicator at which Re number you have to compare the type2 polars. On my AK-8 i start with 14% due to the loads and the go quickly to 11% and 7or8% at the tip. That´s the main reason IMO why using thicker airfoils.īUT: there is no reason to use airfoils thicker than necessary. Jim, due to smaller chords and higher AUW the loads are higher than in a light thermal plane.
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