The arms participate significantly in the pilot’s drag because of a high drag coefficient.
The following example shows the effect on a END wing. There is a gain of about 1 point on glide ratio for all flight regimes. This corresponds to a difference of around 0.005 in Cd, or 0.1 in SCd
It can be seen that the gain on the drag coefficient is slightly lower at high speeds, whereas it should be globally constant over the entire speed range. This is probably due to a change in the balance of the harness, which (negatively) modifies the overall drag. This type of competition harness is very sensitive to the angle of attack.
