robke wrote: ↑
Mon Nov 30, 2020 12:46 am
I have a diy cnc router/mill, so I made molds from aluminum to skip the hassle of sanding and finishing the surfaces. I'll post some pics later.
Anyway, I used a H105 airfoil, which is quite thick, and may not the best choice for wing size/speed.
I would be grateful if PrfctChaos could run a sim for my two existing wings, as well with H105 for comparison if possible.
Small wing : span 700mm, center chord 201mm, area 1100 cm^2
Big wing : Span 850 mm , center chord 244mm, area 1600 cm^2
Hard to tell the speed window, I guess 10-40 kmh between both of them.
Aluminium moulds! Please do put up some pics. That sounds like some NICE moulds!
NB: No Info on your weight, so I'm running the calcs for 80Kg, please let me know if this is not close?
Have added the H105. Please see results below.
Small wing : span 700mm, centre chord 201mm, area 1100 cm^2:
I ran this one for a speed range of around 10-25 knots (16.5-40 km/h), it was the speed range that looked appropriate to me in the calcs. (Lower speed than that and the induced drag just becomes massive)
Calcs show that the H105 does well at the low end of the speed range. However, for a low speed biased design the mh30 beats it by a slim margin. And NACA1506 comes out tops for the general (Balanced) selection.
Big wing : Span 850 mm , centre chord 244mm, area 1600 cm^2
I ran this one for a speed range of around 15-30 km/h, it was the speed range that looked appropriate to me in the calcs. (Lower speed than that and the induced drag just becomes massive)
For a low speed biased wing the NACA2405 would perform better than the H105 according to the calcs. And NACA1605 comes out tops for the general (Balanced) selection.
Happy to run the calcs for a fast wing. Let me know what you have in mind. Whether you want to go VERY fast and small or just freeride fast. I have pretty high hopes for my new and improved freeride wing being made at the moment (750 mm wingspan, 900 cm^2 area posted a page or two back.)