There was a 100k ride a while back, the Dartmoor and South Hams Imp, where the weather forecast was for a strong southwesterly to close in and blanket the moor. So a couple of us put the hammer down onto the moor to try to beat the weather. We got to the first control in Princetown about 10 minutes after it opened, got our cards stamped and then got blown across the moor - doing 20mph on the ascents and close to 50mph on the downhills. We arrived at the second control, checked our watches, ordered cream teas and ate them, and then got our cards stamped as by then the control had opened. Oh happy days. (I think it was a 25kph maximum speed).