Profiles and symmetric airfoils
08-01-2005, 06:21 AM
#2
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RE: Profiles and symmetric airfoils
Thats easy. Semetrical airfoils provide nearly equal lift when right side up and inverted. Profile and 3D planes usually have a fairly thick airfoil also which allows them to have more liftat similar speeds or the same lift at lower speeds as compared to a thinner wing profile. A thicker airfoil also hhelps keep the plane from building so much speed in a dive or on the down lines of manoevers
08-01-2005, 07:30 AM
#3
RE: Profiles and symmetric airfoils
On any type of power plane, you will probably find that a symmetric airfoil flies best. Flat bottom airfoils in particulat and semi-symmetric to a certain extent, are very pitch sensitive to power/air speed changes. You can use down thrust, change stab incidence or use a slightly lifting stab, but the most pleasurable flying airfoil, to me, is the symmetric. At any power setting I am not messing with the elevator trim to keep the plane from climbing or diving.
99% of our models are way over powered compared to a full scale. This gives us a wider speed range which complicates the pitch trim. A symetric airfoil gives you less changes.
99% of our models are way over powered compared to a full scale. This gives us a wider speed range which complicates the pitch trim. A symetric airfoil gives you less changes.
