210ft Rope Swing over a lake (230ft high)

Me and J rented a boat, took it about 30 min from the marina to a secluded bridge (230ft from the lowest metal to the water). Climbed up a big ass hill. He tied a big knot for the anchor. Then we laid on the platform and threaded the rope under every beam all the way to the pillar we were jumping off of. Then I had to scoot to the very edge and cinch of the rope real tight. You could feel a pretty strong pull from the rope, due to the length and weight. The rope was 200 ft long. At the lowest point, I hit around 75mph.