You can park on Chemin du Roc in Villeneuve-la-Comptal on the grassy strip just before the electrical transformer.
(S/E) Walk up Chemin du Roc, do not take Impasse du Roc. Turn left at the next concrete road. A wooden sign indicates the Clément Ader site.
(1) At the end of the concrete road, turn left; do not enter the field.
At the next crossroads, continue to the left. At the end of the path, turn right onto a wider path. Stay on this main path until you reach a large fork.
(2) Turn right and stay on your right. Continue along this path until you reach a T-junction with a coniferous forest opposite.
(3) Turn right. Begin a short descent and you will arrive at a crossroads. Go straight ahead and stay on the right-hand path. Walk along the Pech des Demoiselles to reach another crossroads before the hamlet of Le Roc.
(4) Turn right and follow this wide path southwards to return to the first crossroads.
(1) Turn left onto the path you took on the way out to return to the car park where you started (S/E).