good question but totally diff to club fed flying national racing fatigue comes into it feds are normally spread over a reasonably small area say 40 ish miles and the majority of races are up to 300 ish miles contributing factors are wind, drag, fitness, health , motivation the further out the less drag has an effect as the birds are more split up jmo dave ps- I know NOS fed are spread over a wider area I think the only time ive heard of the west side topping the fed from a short race was in an east wind