Lift to Drag Ratios Compared

[JG27_PapaFly]

Originally Posted by AndyJWest

here seem to be some 'ground effect' factors that can kick in, which could possibly be distorting the results slightly - you might de better to test from say 1000m to 500m, rather than from 500m to sea level.

Ground effect is a decrease in induced drag and only relevant in very low-level flight up to an altitude equaling about the plane's wingspan. BTW i've specifically tested whether ground effect is present in IL2FB some time ago, the results were a clear no. Which is OK, the effect is not THAT big or relevant in RL except during flareout. No, i stand by my experimental setup, it's clean.