Hi Mike
Never tried a preventer on the camberspar. The lines you can see there are either the burgee halyard or the jib sheet.
As a teenager I used to sail a Fireball dinghy and that had a deck hole and sock for the kite. This is just the same. I could definitely improve the mouth of the deck sock though. I have flown the kite solo up to 18 knots without issue. It is easy enough to handle that my 11 year old daughter can control the pole with her hands and no winches.
Despite having seen the video I have not tried tacking with it up yet!
18 knots is the max I have tried with the new kite. The day the photos were taken started out quite light wind. By the end I was getting close to restricted waters and the wind had picked up to 18 - 20 knots true. Autohelm on and down the kite came. I had hoped to carry the kite around the corner and head up Southampton water but the wind veared and increased making discretion a better option.
About three years ago I hoisted the original kite on the round the island race - it didn't last long and started splitting in two (very old). We got it down into the sock before it shredded but whilst it was up the whole boat hummed. I was on the foredeck not the helm at the time so missed seeing what speed we got up to. Such was the feeling of speed and control I went straight out and ordered a new one ( along with a new job and main which transformed the speed and handling).
Keep well
Peter