fluctuated from very light to 16kts, while the Goria finished in challenging 30kt conditions.
‘The last 15 minutes or so as we approached the finish line, we were in a bit of a survival mode,’ Jundt says. ‘We were very concentrated. We basically sailed on the jib and left the mainsail flapping, but we were still making 6-7kts upwind. It was manageable. ‘In this condition, we would have been happy to have the DSS system in place. We could have borne away and generated more righting moment.’
Driven by Jundt’s passion, similar creative tensions applied throughout the QFX project. For the hull design, he approached Hugh Welbourn because he admired his Q28 and Q30 DSS monohulls. ‘His hulls are very low drag and I felt he had well understood what was required for lake sailing.’
Having settled on 35ft LOA, the hull design was quite straightforward. ‘Hugh took the Q30 concept, which is fantastic, and extruded it and made some minor modifications. We arrived at the general size and righting
76 SEAHORSE
moment very quickly. ‘With the foils, though, we had lots of discussion. In the end, I said he should only deliver the hull and deck and we would finish the boat in Switzerland.’
The issue was Jundt’s insistence that in light air mode, the foil had to retract completely out of the water, which meant the lower exit point had to be above the waterline. ‘The reality is that we will only use the DSS system 20-30 per cent of the time. So, we must be able to sail well for the majority 70-80 per cent of the time and you cannot do that dragging a foil through the water.’ Achieving the geometry and shapes required to achieve the two foiling modes – DSS skimming and full flight – and then being able to fully retract the foil without impeding the rig and the sails above deck took considerable juggling. Once Jundt had designed what he wanted, Welbourn began building the foil. The strategy is that sailing in medium airs, the foil is deployed to a first stage, which provides the DSS skimming mode. In fresher breezes, the foil is pushed deeper to a second
Above: QFX in full flight. One notable and unusual design fea- ture is the high exit of the foils, well above the waterline. This aims to address the Achilles’ Heel of foiling raceboats, which tend to perform poorly in light airs because their boatspeed is compromised by dragging a foil through the water. In light air mode QFX’s foils are complete- ly out of the water, even when the boat heels 15°. This is
particularly important for lake racing, when winds are light about 70-80 per cent of the time. Left:QFX scored some respectable racing results even before its foils were fitted. Now in full foiling mode its full potential is yet to be seen
stage, which transforms the foil angle from an L-configuration to a self-regulating full-flight V-shape. For displacement sailing, the foil is pulled up snug against the hull above the waterline and then the top bearing in the deck is designed to slide inboard, leaving the foil shaft leaning against the mast and clear of the sails. ‘It means the boat can heel to 15° without the foil tip touching the water,’ Jundt explains. ‘It was a no-go, if we could not achieve that.’ Responding to the various sailing modes, the rig arrangement is similarly flexible. Basically, it is a double-spreader fractional rig, with a large mainsail and small jib set back from the stem, with an ability to carry larger headsails on furlers, either in fractional mode above the hounds and down to the stem, or at the masthead and out to the end of a large prod.
The headsails range in size from
90m2 to 12m2 and the 40m2 mainsail has provision for two reefs. Jundt envisages that in foiling mode, the mainsail will be reefed to the hounds, triangulating with the jib to lower the centre of pressure. Those experiments await the next northern summer when Jundt and his crew look forward to taking off in full flight. ‘We are all in our 60s and have sailed together for many years. At the yacht club we are known as the crazy boys,’ he laughs. ‘Between us, a lot of lake sailing experience has gone into this project. ‘The crew is happy, because with
the Mirabaud project we got a bit tired of capsizing and not finishing races,’ says Jundt. ‘Already, the boat works better than I imagined.’ His only reservation: ‘I think it still could be lighter. It is too strong.’
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