Steve's bang on about that. DC employed quick turnaround in all his timed runs of December 66 (10th, 12th, 13th and 14th) and the two un-timed Christmas Day and Dec 27th runs. I would wager, although we can never know for sure, that DC was always coming back immediately on the 4th. (From his perspective of water condition certainty, it was the best methodology).f1steveuk wrote:Plus of course DC had successfully practiced the "quick turnaround" system more than a couple of times
The key is in being comfortable in the run up on run 2, but the really high speed middle 3 km (one km either side of and the measured km) being as good as they were on the way down. Campbell calculated and had actual proof that this would be the case. He would run into water brake chop early on the return at relatively low speed, and would be below 250 mph by the time he met his wash from the first run 1km plus north of the measured kilo. We also calculated that in slowing down at the end of the second run, DC would in all likelihood have needed to run to the head of the lake, overshooting Pier Cottage.
One interesting thing I have discussed with Bill, the Orpheus cut out on both runs on the 4th after approx. 31 seconds of sustained max throttle. (using Campbell's commentary from run 1 and photographic evidence from run, 2, which incidentally, commenced 3mins 18 seconds from Campbell starting run 1)
Bill is hoping to be in the position to retest the fuel system to see if this failure replicates itself in due course. It could point to an intermittent electrical failure or a fuel flow issue to the booster pump.